From patchwork Wed May 27 17:36:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Jordan X-Patchwork-Id: 11573673 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2F47114F6 for ; Wed, 27 May 2020 17:38:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id F005320707 for ; Wed, 27 May 2020 17:38:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="ONbNgPHl" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F005320707 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 3A4798001A; Wed, 27 May 2020 13:38:43 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 37BC580010; Wed, 27 May 2020 13:38:43 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2905C8001A; Wed, 27 May 2020 13:38:43 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0095.hostedemail.com [216.40.44.95]) by kanga.kvack.org (Postfix) with ESMTP id 1121680010 for ; Wed, 27 May 2020 13:38:43 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id C8195181AC9B6 for ; Wed, 27 May 2020 17:38:42 +0000 (UTC) X-FDA: 76863208884.20.sleet97_63127d226d54 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin20.hostedemail.com (Postfix) with ESMTP id A988D1825B0D9 for ; Wed, 27 May 2020 17:38:42 +0000 (UTC) X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,daniel.m.jordan@oracle.com,,RULES_HIT:30012:30054:30064,0,RBL:156.151.31.85:@oracle.com:.lbl8.mailshell.net-62.18.0.100 64.10.201.10,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:ft,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:23,LUA_SUMMARY:none X-HE-Tag: sleet97_63127d226d54 X-Filterd-Recvd-Size: 5284 Received: from userp2120.oracle.com (userp2120.oracle.com [156.151.31.85]) by imf32.hostedemail.com (Postfix) with ESMTP for ; Wed, 27 May 2020 17:38:41 +0000 (UTC) Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04RHbktf180268; Wed, 27 May 2020 17:38:31 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=YM4/U9R5Ai/FZVrK2lejcDvXTt4wGV0YuZreByw2PVw=; b=ONbNgPHl5oyznl61QFZsiddnJ8sk22qW/2JbG05uDr5somsFFSAgsjdvWq9e3usiIQhb rj0gbapNPBTdUVF8Oya7JXLlxkP2ju17Z4tpjef90YGlAxgvXVxk5LV2K4WdnyDpOVKf KLNtdJCAM1+6phQr2LVCmReq/HlliB/k9uLA19jDYe+pHzUgodt7jogXxQGiaiYX602i irtZ77Nq4sKeW7GLn4yBQmAKtInuMxF8kfeO7lRxioy0jzM6uzjSaTvEI+S+LnLulL+K LpI5ZT2i3s+cJsn+19Kb1mFrCoXrP+V6KkYb9uurHjBEVpGbL9ek9KYOF4pngSz5t9W6 NA== Received: from aserp3020.oracle.com (aserp3020.oracle.com [141.146.126.70]) by userp2120.oracle.com with ESMTP id 318xbk0vds-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 27 May 2020 17:38:31 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04RHXcrv105464; Wed, 27 May 2020 17:36:30 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserp3020.oracle.com with ESMTP id 317j5sfs53-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 27 May 2020 17:36:30 +0000 Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 04RHaIa2012609; Wed, 27 May 2020 17:36:18 GMT Received: from localhost.localdomain (/98.229.125.203) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 27 May 2020 10:36:18 -0700 From: Daniel Jordan To: Andrew Morton , Herbert Xu , Steffen Klassert Cc: Alex Williamson , Alexander Duyck , Dan Williams , Dave Hansen , David Hildenbrand , Jason Gunthorpe , Jonathan Corbet , Josh Triplett , Kirill Tkhai , Michal Hocko , Pavel Machek , Pavel Tatashin , Peter Zijlstra , Randy Dunlap , Robert Elliott , Shile Zhang , Steven Sistare , Tejun Heo , Zi Yan , linux-crypto@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Daniel Jordan Subject: [PATCH v3 1/8] padata: remove exit routine Date: Wed, 27 May 2020 13:36:01 -0400 Message-Id: <20200527173608.2885243-2-daniel.m.jordan@oracle.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200527173608.2885243-1-daniel.m.jordan@oracle.com> References: <20200527173608.2885243-1-daniel.m.jordan@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9633 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 spamscore=0 suspectscore=2 mlxlogscore=999 mlxscore=0 adultscore=0 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005270137 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9633 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 spamscore=0 mlxscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 cotscore=-2147483648 suspectscore=2 bulkscore=0 clxscore=1015 impostorscore=0 malwarescore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005270137 X-Rspamd-Queue-Id: A988D1825B0D9 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: padata_driver_exit() is unnecessary because padata isn't built as a module and doesn't exit. padata's init routine will soon allocate memory, so getting rid of the exit function now avoids pointless code to free it. Signed-off-by: Daniel Jordan Tested-by: Josh Triplett --- kernel/padata.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/kernel/padata.c b/kernel/padata.c index a6afa12fb75ee..835919c745266 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -1072,10 +1072,4 @@ static __init int padata_driver_init(void) } module_init(padata_driver_init); -static __exit void padata_driver_exit(void) -{ - cpuhp_remove_multi_state(CPUHP_PADATA_DEAD); - cpuhp_remove_multi_state(hp_online); -} -module_exit(padata_driver_exit); #endif From patchwork Wed May 27 17:36:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Jordan X-Patchwork-Id: 11573645 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 55F5614F6 for ; Wed, 27 May 2020 17:37:12 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2086920DD4 for ; Wed, 27 May 2020 17:37:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="GMaJk/YN" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2086920DD4 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 048DE8001A; Wed, 27 May 2020 13:37:11 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id F17C680010; Wed, 27 May 2020 13:37:10 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E02858001A; Wed, 27 May 2020 13:37:10 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0210.hostedemail.com [216.40.44.210]) by kanga.kvack.org (Postfix) with ESMTP id C47EC80010 for ; Wed, 27 May 2020 13:37:10 -0400 (EDT) Received: from smtpin23.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 87859DA98D for ; Wed, 27 May 2020 17:37:10 +0000 (UTC) X-FDA: 76863205020.23.toy72_2c1382f26d54 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin23.hostedemail.com (Postfix) with ESMTP id 753603760C for ; Wed, 27 May 2020 17:37:10 +0000 (UTC) X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,daniel.m.jordan@oracle.com,,RULES_HIT:30029:30054:30064,0,RBL:156.151.31.85:@oracle.com:.lbl8.mailshell.net-62.18.0.100 64.10.201.10,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:ft,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:25,LUA_SUMMARY:none X-HE-Tag: toy72_2c1382f26d54 X-Filterd-Recvd-Size: 7274 Received: from userp2120.oracle.com (userp2120.oracle.com [156.151.31.85]) by imf05.hostedemail.com (Postfix) with ESMTP for ; Wed, 27 May 2020 17:37:09 +0000 (UTC) Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04RHRk7S158957; Wed, 27 May 2020 17:36:32 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=efP/mXxmY+Jo1bVM+X6fJTP9YFt5MPHFZ0S23zpocQ4=; b=GMaJk/YNJ4X9LiJmPh3oard50FHo21spuc/kg1iGAYwJbub5g3aVkizfWzf5MWkgAXSz cAInd1o+XcfcRT1zq7MYQ/T2yadm7PdQ5FgyDlNmYilNPP6N374z/jzHL/r5OwiyDAGl +HbXKaIqWQBZcDb73/aT3iXS4Dh9oOR6H85HxlbIogB+mQvaaTOZWpq/4hMH3ci+dTDQ /WTcXndjy0DWdNku1rOf9G4K2HWec6h3ehxzMUTk9MBYtP+byjAFRvWrNheA0SToMGbq 5pYQuGRhbmCpsAZs8Q96+c/iXK9z0BKRpJ2sZq8RfXxKM5NUw1TG8OOxhGwvbRcOYQ8T 1Q== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by userp2120.oracle.com with ESMTP id 318xbk0v58-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 27 May 2020 17:36:32 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04RHXbJm142828; Wed, 27 May 2020 17:36:31 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3020.oracle.com with ESMTP id 317dkutu3u-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 27 May 2020 17:36:31 +0000 Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 04RHaK0V003965; Wed, 27 May 2020 17:36:20 GMT Received: from localhost.localdomain (/98.229.125.203) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 27 May 2020 10:36:20 -0700 From: Daniel Jordan To: Andrew Morton , Herbert Xu , Steffen Klassert Cc: Alex Williamson , Alexander Duyck , Dan Williams , Dave Hansen , David Hildenbrand , Jason Gunthorpe , Jonathan Corbet , Josh Triplett , Kirill Tkhai , Michal Hocko , Pavel Machek , Pavel Tatashin , Peter Zijlstra , Randy Dunlap , Robert Elliott , Shile Zhang , Steven Sistare , Tejun Heo , Zi Yan , linux-crypto@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Daniel Jordan Subject: [PATCH v3 2/8] padata: initialize earlier Date: Wed, 27 May 2020 13:36:02 -0400 Message-Id: <20200527173608.2885243-3-daniel.m.jordan@oracle.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200527173608.2885243-1-daniel.m.jordan@oracle.com> References: <20200527173608.2885243-1-daniel.m.jordan@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9633 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 malwarescore=0 bulkscore=0 spamscore=0 suspectscore=2 mlxscore=0 adultscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005270137 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9633 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 spamscore=0 mlxscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 cotscore=-2147483648 suspectscore=2 bulkscore=0 clxscore=1015 impostorscore=0 malwarescore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005270136 X-Rspamd-Queue-Id: 753603760C X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: padata will soon initialize the system's struct pages in parallel, so it needs to be ready by page_alloc_init_late(). The error return from padata_driver_init() triggers an initcall warning, so add a warning to padata_init() to avoid silent failure. Signed-off-by: Daniel Jordan Tested-by: Josh Triplett --- include/linux/padata.h | 6 ++++++ init/main.c | 2 ++ kernel/padata.c | 17 ++++++++--------- 3 files changed, 16 insertions(+), 9 deletions(-) diff --git a/include/linux/padata.h b/include/linux/padata.h index a0d8b41850b25..476ecfa41f363 100644 --- a/include/linux/padata.h +++ b/include/linux/padata.h @@ -164,6 +164,12 @@ struct padata_instance { #define PADATA_INVALID 4 }; +#ifdef CONFIG_PADATA +extern void __init padata_init(void); +#else +static inline void __init padata_init(void) {} +#endif + extern struct padata_instance *padata_alloc_possible(const char *name); extern void padata_free(struct padata_instance *pinst); extern struct padata_shell *padata_alloc_shell(struct padata_instance *pinst); diff --git a/init/main.c b/init/main.c index 03371976d3872..df32f67214d23 100644 --- a/init/main.c +++ b/init/main.c @@ -63,6 +63,7 @@ #include #include #include +#include #include #include #include @@ -1482,6 +1483,7 @@ static noinline void __init kernel_init_freeable(void) smp_init(); sched_init_smp(); + padata_init(); page_alloc_init_late(); /* Initialize page ext after all struct pages are initialized. */ page_ext_init(); diff --git a/kernel/padata.c b/kernel/padata.c index 835919c745266..6f709bc0fc413 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -31,7 +31,6 @@ #include #include #include -#include #define MAX_OBJ_NUM 1000 @@ -1050,26 +1049,26 @@ void padata_free_shell(struct padata_shell *ps) } EXPORT_SYMBOL(padata_free_shell); -#ifdef CONFIG_HOTPLUG_CPU - -static __init int padata_driver_init(void) +void __init padata_init(void) { +#ifdef CONFIG_HOTPLUG_CPU int ret; ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "padata:online", padata_cpu_online, NULL); if (ret < 0) - return ret; + goto err; hp_online = ret; ret = cpuhp_setup_state_multi(CPUHP_PADATA_DEAD, "padata:dead", NULL, padata_cpu_dead); if (ret < 0) { cpuhp_remove_multi_state(hp_online); - return ret; + goto err; } - return 0; -} -module_init(padata_driver_init); + return; +err: + pr_warn("padata: initialization failed\n"); #endif +} From patchwork Wed May 27 17:36:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Jordan X-Patchwork-Id: 11573649 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1304814C0 for ; Wed, 27 May 2020 17:37:17 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id C5FEF207E8 for ; Wed, 27 May 2020 17:37:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="zvG0G9oL" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C5FEF207E8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id C5B3C800B8; Wed, 27 May 2020 13:37:11 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id B933680010; Wed, 27 May 2020 13:37:11 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9723B800B8; Wed, 27 May 2020 13:37:11 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0145.hostedemail.com [216.40.44.145]) by kanga.kvack.org (Postfix) with ESMTP id 7102E800B6 for ; Wed, 27 May 2020 13:37:11 -0400 (EDT) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 37D45DA01D for ; Wed, 27 May 2020 17:37:11 +0000 (UTC) X-FDA: 76863205062.09.fang97_400b97f26d54 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin09.hostedemail.com (Postfix) with ESMTP id 1996F180AD806 for ; Wed, 27 May 2020 17:37:11 +0000 (UTC) X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,daniel.m.jordan@oracle.com,,RULES_HIT:4423:30034:30036:30051:30054:30064:30075,0,RBL:156.151.31.85:@oracle.com:.lbl8.mailshell.net-64.10.201.10 62.18.0.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:ft,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:25,LUA_SUMMARY:none X-HE-Tag: fang97_400b97f26d54 X-Filterd-Recvd-Size: 13455 Received: from userp2120.oracle.com (userp2120.oracle.com [156.151.31.85]) by imf06.hostedemail.com (Postfix) with ESMTP for ; Wed, 27 May 2020 17:37:09 +0000 (UTC) Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04RHRkt0158992; Wed, 27 May 2020 17:36:31 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=ZJOarWh9CgJXEAOVZAeqqgIPtu275WxEdY7spy9pBHI=; b=zvG0G9oLT+zza60H7oY5fBnslNMsVp0U//B5bfkPtJj3HC+x12/s4OpqjajE7Xh1KTLI guVG2wdby+T9u7CvLjT6wkVblmLvq2tXzLjtV204AOhObiYeTTm4KKKuPUKHog2l15/5 93UBPOQavAd2GCaEHQNnZo7cjVAbxgLYPPPR13hK1JQFQiMIcyCy/Fw5w8v+fTKnEVfx 6sPGkDy0QwOwpUNb0+zQaYrCuLslTNMdzpIwHDHq2wuNW0+r7FxXHuQJJA/upSmaxIjK 6mw+lpPNhMKtB+Df5TqtpAh8W2f1o3W+UgaNSXnIPpisMjqrvGGHSR26FQcUwfwJNC0E pg== Received: from aserp3020.oracle.com (aserp3020.oracle.com [141.146.126.70]) by userp2120.oracle.com with ESMTP id 318xbk0v55-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 27 May 2020 17:36:31 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04RHXbxw105368; Wed, 27 May 2020 17:36:30 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3020.oracle.com with ESMTP id 317j5sfs4j-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 27 May 2020 17:36:30 +0000 Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 04RHaM2x013632; Wed, 27 May 2020 17:36:23 GMT Received: from localhost.localdomain (/98.229.125.203) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 27 May 2020 10:36:22 -0700 From: Daniel Jordan To: Andrew Morton , Herbert Xu , Steffen Klassert Cc: Alex Williamson , Alexander Duyck , Dan Williams , Dave Hansen , David Hildenbrand , Jason Gunthorpe , Jonathan Corbet , Josh Triplett , Kirill Tkhai , Michal Hocko , Pavel Machek , Pavel Tatashin , Peter Zijlstra , Randy Dunlap , Robert Elliott , Shile Zhang , Steven Sistare , Tejun Heo , Zi Yan , linux-crypto@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Daniel Jordan Subject: [PATCH v3 3/8] padata: allocate work structures for parallel jobs from a pool Date: Wed, 27 May 2020 13:36:03 -0400 Message-Id: <20200527173608.2885243-4-daniel.m.jordan@oracle.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200527173608.2885243-1-daniel.m.jordan@oracle.com> References: <20200527173608.2885243-1-daniel.m.jordan@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9633 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 spamscore=0 suspectscore=2 mlxlogscore=999 mlxscore=0 adultscore=0 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005270137 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9633 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 spamscore=0 mlxscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 cotscore=-2147483648 suspectscore=2 bulkscore=0 clxscore=1015 impostorscore=0 malwarescore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005270136 X-Rspamd-Queue-Id: 1996F180AD806 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: padata allocates per-CPU, per-instance work structs for parallel jobs. A do_parallel call assigns a job to a sequence number and hashes the number to a CPU, where the job will eventually run using the corresponding work. This approach fit with how padata used to bind a job to each CPU round-robin, makes less sense after commit bfde23ce200e6 ("padata: unbind parallel jobs from specific CPUs") because a work isn't bound to a particular CPU anymore, and isn't needed at all for multithreaded jobs because they don't have sequence numbers. Replace the per-CPU works with a preallocated pool, which allows sharing them between existing padata users and the upcoming multithreaded user. The pool will also facilitate setting NUMA-aware concurrency limits with later users. The pool is sized according to the number of possible CPUs. With this limit, MAX_OBJ_NUM no longer makes sense, so remove it. If the global pool is exhausted, a parallel job is run in the current task instead to throttle a system trying to do too much in parallel. Signed-off-by: Daniel Jordan Tested-by: Josh Triplett --- include/linux/padata.h | 8 +-- kernel/padata.c | 118 +++++++++++++++++++++++++++-------------- 2 files changed, 78 insertions(+), 48 deletions(-) diff --git a/include/linux/padata.h b/include/linux/padata.h index 476ecfa41f363..3bfa503503ac5 100644 --- a/include/linux/padata.h +++ b/include/linux/padata.h @@ -24,7 +24,6 @@ * @list: List entry, to attach to the padata lists. * @pd: Pointer to the internal control structure. * @cb_cpu: Callback cpu for serializatioon. - * @cpu: Cpu for parallelization. * @seq_nr: Sequence number of the parallelized data object. * @info: Used to pass information from the parallel to the serial function. * @parallel: Parallel execution function. @@ -34,7 +33,6 @@ struct padata_priv { struct list_head list; struct parallel_data *pd; int cb_cpu; - int cpu; unsigned int seq_nr; int info; void (*parallel)(struct padata_priv *padata); @@ -68,15 +66,11 @@ struct padata_serial_queue { /** * struct padata_parallel_queue - The percpu padata parallel queue * - * @parallel: List to wait for parallelization. * @reorder: List to wait for reordering after parallel processing. - * @work: work struct for parallelization. * @num_obj: Number of objects that are processed by this cpu. */ struct padata_parallel_queue { - struct padata_list parallel; struct padata_list reorder; - struct work_struct work; atomic_t num_obj; }; @@ -111,7 +105,7 @@ struct parallel_data { struct padata_parallel_queue __percpu *pqueue; struct padata_serial_queue __percpu *squeue; atomic_t refcnt; - atomic_t seq_nr; + unsigned int seq_nr; unsigned int processed; int cpu; struct padata_cpumask cpumask; diff --git a/kernel/padata.c b/kernel/padata.c index 6f709bc0fc413..78ff9aa529204 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -32,7 +32,15 @@ #include #include -#define MAX_OBJ_NUM 1000 +struct padata_work { + struct work_struct pw_work; + struct list_head pw_list; /* padata_free_works linkage */ + void *pw_data; +}; + +static DEFINE_SPINLOCK(padata_works_lock); +static struct padata_work *padata_works; +static LIST_HEAD(padata_free_works); static void padata_free_pd(struct parallel_data *pd); @@ -58,30 +66,44 @@ static int padata_cpu_hash(struct parallel_data *pd, unsigned int seq_nr) return padata_index_to_cpu(pd, cpu_index); } -static void padata_parallel_worker(struct work_struct *parallel_work) +static struct padata_work *padata_work_alloc(void) { - struct padata_parallel_queue *pqueue; - LIST_HEAD(local_list); + struct padata_work *pw; - local_bh_disable(); - pqueue = container_of(parallel_work, - struct padata_parallel_queue, work); + lockdep_assert_held(&padata_works_lock); - spin_lock(&pqueue->parallel.lock); - list_replace_init(&pqueue->parallel.list, &local_list); - spin_unlock(&pqueue->parallel.lock); + if (list_empty(&padata_free_works)) + return NULL; /* No more work items allowed to be queued. */ - while (!list_empty(&local_list)) { - struct padata_priv *padata; + pw = list_first_entry(&padata_free_works, struct padata_work, pw_list); + list_del(&pw->pw_list); + return pw; +} - padata = list_entry(local_list.next, - struct padata_priv, list); +static void padata_work_init(struct padata_work *pw, work_func_t work_fn, + void *data) +{ + INIT_WORK(&pw->pw_work, work_fn); + pw->pw_data = data; +} - list_del_init(&padata->list); +static void padata_work_free(struct padata_work *pw) +{ + lockdep_assert_held(&padata_works_lock); + list_add(&pw->pw_list, &padata_free_works); +} - padata->parallel(padata); - } +static void padata_parallel_worker(struct work_struct *parallel_work) +{ + struct padata_work *pw = container_of(parallel_work, struct padata_work, + pw_work); + struct padata_priv *padata = pw->pw_data; + local_bh_disable(); + padata->parallel(padata); + spin_lock(&padata_works_lock); + padata_work_free(pw); + spin_unlock(&padata_works_lock); local_bh_enable(); } @@ -105,9 +127,9 @@ int padata_do_parallel(struct padata_shell *ps, struct padata_priv *padata, int *cb_cpu) { struct padata_instance *pinst = ps->pinst; - int i, cpu, cpu_index, target_cpu, err; - struct padata_parallel_queue *queue; + int i, cpu, cpu_index, err; struct parallel_data *pd; + struct padata_work *pw; rcu_read_lock_bh(); @@ -135,25 +157,25 @@ int padata_do_parallel(struct padata_shell *ps, if ((pinst->flags & PADATA_RESET)) goto out; - if (atomic_read(&pd->refcnt) >= MAX_OBJ_NUM) - goto out; - - err = 0; atomic_inc(&pd->refcnt); padata->pd = pd; padata->cb_cpu = *cb_cpu; - padata->seq_nr = atomic_inc_return(&pd->seq_nr); - target_cpu = padata_cpu_hash(pd, padata->seq_nr); - padata->cpu = target_cpu; - queue = per_cpu_ptr(pd->pqueue, target_cpu); - - spin_lock(&queue->parallel.lock); - list_add_tail(&padata->list, &queue->parallel.list); - spin_unlock(&queue->parallel.lock); + rcu_read_unlock_bh(); - queue_work(pinst->parallel_wq, &queue->work); + spin_lock(&padata_works_lock); + padata->seq_nr = ++pd->seq_nr; + pw = padata_work_alloc(); + spin_unlock(&padata_works_lock); + if (pw) { + padata_work_init(pw, padata_parallel_worker, padata); + queue_work(pinst->parallel_wq, &pw->pw_work); + } else { + /* Maximum works limit exceeded, run in the current task. */ + padata->parallel(padata); + } + return 0; out: rcu_read_unlock_bh(); @@ -324,8 +346,9 @@ static void padata_serial_worker(struct work_struct *serial_work) void padata_do_serial(struct padata_priv *padata) { struct parallel_data *pd = padata->pd; + int hashed_cpu = padata_cpu_hash(pd, padata->seq_nr); struct padata_parallel_queue *pqueue = per_cpu_ptr(pd->pqueue, - padata->cpu); + hashed_cpu); struct padata_priv *cur; spin_lock(&pqueue->reorder.lock); @@ -416,8 +439,6 @@ static void padata_init_pqueues(struct parallel_data *pd) pqueue = per_cpu_ptr(pd->pqueue, cpu); __padata_list_init(&pqueue->reorder); - __padata_list_init(&pqueue->parallel); - INIT_WORK(&pqueue->work, padata_parallel_worker); atomic_set(&pqueue->num_obj, 0); } } @@ -451,7 +472,7 @@ static struct parallel_data *padata_alloc_pd(struct padata_shell *ps) padata_init_pqueues(pd); padata_init_squeues(pd); - atomic_set(&pd->seq_nr, -1); + pd->seq_nr = -1; atomic_set(&pd->refcnt, 1); spin_lock_init(&pd->lock); pd->cpu = cpumask_first(pd->cpumask.pcpu); @@ -1051,6 +1072,7 @@ EXPORT_SYMBOL(padata_free_shell); void __init padata_init(void) { + unsigned int i, possible_cpus; #ifdef CONFIG_HOTPLUG_CPU int ret; @@ -1062,13 +1084,27 @@ void __init padata_init(void) ret = cpuhp_setup_state_multi(CPUHP_PADATA_DEAD, "padata:dead", NULL, padata_cpu_dead); - if (ret < 0) { - cpuhp_remove_multi_state(hp_online); - goto err; - } + if (ret < 0) + goto remove_online_state; +#endif + + possible_cpus = num_possible_cpus(); + padata_works = kmalloc_array(possible_cpus, sizeof(struct padata_work), + GFP_KERNEL); + if (!padata_works) + goto remove_dead_state; + + for (i = 0; i < possible_cpus; ++i) + list_add(&padata_works[i].pw_list, &padata_free_works); return; + +remove_dead_state: +#ifdef CONFIG_HOTPLUG_CPU + cpuhp_remove_multi_state(CPUHP_PADATA_DEAD); +remove_online_state: + cpuhp_remove_multi_state(hp_online); err: - pr_warn("padata: initialization failed\n"); #endif + pr_warn("padata: initialization failed\n"); } From patchwork Wed May 27 17:36:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Jordan X-Patchwork-Id: 11573651 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5068C14C0 for ; Wed, 27 May 2020 17:37:19 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 100FF208B8 for ; Wed, 27 May 2020 17:37:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="gpqMIRSS" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 100FF208B8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2465F80010; Wed, 27 May 2020 13:37:12 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 1D00D800B6; Wed, 27 May 2020 13:37:12 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F3D8380010; Wed, 27 May 2020 13:37:11 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0131.hostedemail.com [216.40.44.131]) by kanga.kvack.org (Postfix) with ESMTP id BBEED800B6 for ; Wed, 27 May 2020 13:37:11 -0400 (EDT) Received: from smtpin15.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 83140180AD804 for ; Wed, 27 May 2020 17:37:11 +0000 (UTC) X-FDA: 76863205062.15.legs50_5001efb26d54 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin15.hostedemail.com (Postfix) with ESMTP id 54F6D1814B0C9 for ; Wed, 27 May 2020 17:37:11 +0000 (UTC) X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,daniel.m.jordan@oracle.com,,RULES_HIT:30005:30034:30054:30064:30067:30074:30090,0,RBL:156.151.31.85:@oracle.com:.lbl8.mailshell.net-62.18.0.100 64.10.201.10,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:ft,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:2,LUA_SUMMARY:none X-HE-Tag: legs50_5001efb26d54 X-Filterd-Recvd-Size: 14109 Received: from userp2120.oracle.com (userp2120.oracle.com [156.151.31.85]) by imf25.hostedemail.com (Postfix) with ESMTP for ; Wed, 27 May 2020 17:37:09 +0000 (UTC) Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04RHRnBo159300; Wed, 27 May 2020 17:36:31 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=8ztsrQeoWYCfb7JFrFcvLi0nB8lJ6Flwt07F20xyilM=; b=gpqMIRSSRDyAsGxQlMF8vZZvbw67UlETR0Mnr72cjOwpYe0Fu71PErHhXJ57MowK5G9j KPMyoDxCtd8ftZ0dxmafqGRTebGZwMoyfbjbJNs8Dk8NCNX7Pp6cqK8jBwVcSqF/qmQC Afa/vq6EHmv0WPnhFYlm/adMUn9GxBRWz/lsQUWauDyLcVW5elLIA+5zQL+NGSDE/69F gCchPhIOaAe2utAl9+bvDytZrrMi8yh7lKWNbtfE5KFvsvrS/iXlmqz1s0ATRC1x8PE5 fuWEgQVRtfEhjP45CtrMaaE7VULPtbrVaiUBRXt/8F4jkZktqLhUE6LzaS0UgMrRpu2N Jw== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by userp2120.oracle.com with ESMTP id 318xbk0v54-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 27 May 2020 17:36:30 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04RHX5Au195653; Wed, 27 May 2020 17:36:30 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3030.oracle.com with ESMTP id 317ddr6jux-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 27 May 2020 17:36:30 +0000 Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 04RHaPFx013665; Wed, 27 May 2020 17:36:25 GMT Received: from localhost.localdomain (/98.229.125.203) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 27 May 2020 10:36:24 -0700 From: Daniel Jordan To: Andrew Morton , Herbert Xu , Steffen Klassert Cc: Alex Williamson , Alexander Duyck , Dan Williams , Dave Hansen , David Hildenbrand , Jason Gunthorpe , Jonathan Corbet , Josh Triplett , Kirill Tkhai , Michal Hocko , Pavel Machek , Pavel Tatashin , Peter Zijlstra , Randy Dunlap , Robert Elliott , Shile Zhang , Steven Sistare , Tejun Heo , Zi Yan , linux-crypto@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Daniel Jordan Subject: [PATCH v3 4/8] padata: add basic support for multithreaded jobs Date: Wed, 27 May 2020 13:36:04 -0400 Message-Id: <20200527173608.2885243-5-daniel.m.jordan@oracle.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200527173608.2885243-1-daniel.m.jordan@oracle.com> References: <20200527173608.2885243-1-daniel.m.jordan@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9633 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 bulkscore=0 mlxscore=0 phishscore=0 adultscore=0 suspectscore=2 spamscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005270137 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9633 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 spamscore=0 mlxscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 cotscore=-2147483648 suspectscore=2 bulkscore=0 clxscore=1015 impostorscore=0 malwarescore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005270136 X-Rspamd-Queue-Id: 54F6D1814B0C9 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Sometimes the kernel doesn't take full advantage of system memory bandwidth, leading to a single CPU spending excessive time in initialization paths where the data scales with memory size. Multithreading naturally addresses this problem. Extend padata, a framework that handles many parallel yet singlethreaded jobs, to also handle multithreaded jobs by adding support for splitting up the work evenly, specifying a minimum amount of work that's appropriate for one helper thread to do, load balancing between helpers, and coordinating them. This is inspired by work from Pavel Tatashin and Steve Sistare. Signed-off-by: Daniel Jordan Tested-by: Josh Triplett --- include/linux/padata.h | 29 ++++++++ kernel/padata.c | 152 ++++++++++++++++++++++++++++++++++++++++- 2 files changed, 178 insertions(+), 3 deletions(-) diff --git a/include/linux/padata.h b/include/linux/padata.h index 3bfa503503ac5..b0affa466a841 100644 --- a/include/linux/padata.h +++ b/include/linux/padata.h @@ -4,6 +4,9 @@ * * Copyright (C) 2008, 2009 secunet Security Networks AG * Copyright (C) 2008, 2009 Steffen Klassert + * + * Copyright (c) 2020 Oracle and/or its affiliates. + * Author: Daniel Jordan */ #ifndef PADATA_H @@ -130,6 +133,31 @@ struct padata_shell { struct list_head list; }; +/** + * struct padata_mt_job - represents one multithreaded job + * + * @thread_fn: Called for each chunk of work that a padata thread does. + * @fn_arg: The thread function argument. + * @start: The start of the job (units are job-specific). + * @size: size of this node's work (units are job-specific). + * @align: Ranges passed to the thread function fall on this boundary, with the + * possible exceptions of the beginning and end of the job. + * @min_chunk: The minimum chunk size in job-specific units. This allows + * the client to communicate the minimum amount of work that's + * appropriate for one worker thread to do at once. + * @max_threads: Max threads to use for the job, actual number may be less + * depending on task size and minimum chunk size. + */ +struct padata_mt_job { + void (*thread_fn)(unsigned long start, unsigned long end, void *arg); + void *fn_arg; + unsigned long start; + unsigned long size; + unsigned long align; + unsigned long min_chunk; + int max_threads; +}; + /** * struct padata_instance - The overall control structure. * @@ -171,6 +199,7 @@ extern void padata_free_shell(struct padata_shell *ps); extern int padata_do_parallel(struct padata_shell *ps, struct padata_priv *padata, int *cb_cpu); extern void padata_do_serial(struct padata_priv *padata); +extern void __init padata_do_multithreaded(struct padata_mt_job *job); extern int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type, cpumask_var_t cpumask); extern int padata_start(struct padata_instance *pinst); diff --git a/kernel/padata.c b/kernel/padata.c index 78ff9aa529204..e78f57d9aef90 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -7,6 +7,9 @@ * Copyright (C) 2008, 2009 secunet Security Networks AG * Copyright (C) 2008, 2009 Steffen Klassert * + * Copyright (c) 2020 Oracle and/or its affiliates. + * Author: Daniel Jordan + * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. @@ -21,6 +24,7 @@ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. */ +#include #include #include #include @@ -32,6 +36,8 @@ #include #include +#define PADATA_WORK_ONSTACK 1 /* Work's memory is on stack */ + struct padata_work { struct work_struct pw_work; struct list_head pw_list; /* padata_free_works linkage */ @@ -42,7 +48,17 @@ static DEFINE_SPINLOCK(padata_works_lock); static struct padata_work *padata_works; static LIST_HEAD(padata_free_works); +struct padata_mt_job_state { + spinlock_t lock; + struct completion completion; + struct padata_mt_job *job; + int nworks; + int nworks_fini; + unsigned long chunk_size; +}; + static void padata_free_pd(struct parallel_data *pd); +static void __init padata_mt_helper(struct work_struct *work); static int padata_index_to_cpu(struct parallel_data *pd, int cpu_index) { @@ -81,18 +97,56 @@ static struct padata_work *padata_work_alloc(void) } static void padata_work_init(struct padata_work *pw, work_func_t work_fn, - void *data) + void *data, int flags) { - INIT_WORK(&pw->pw_work, work_fn); + if (flags & PADATA_WORK_ONSTACK) + INIT_WORK_ONSTACK(&pw->pw_work, work_fn); + else + INIT_WORK(&pw->pw_work, work_fn); pw->pw_data = data; } +static int __init padata_work_alloc_mt(int nworks, void *data, + struct list_head *head) +{ + int i; + + spin_lock(&padata_works_lock); + /* Start at 1 because the current task participates in the job. */ + for (i = 1; i < nworks; ++i) { + struct padata_work *pw = padata_work_alloc(); + + if (!pw) + break; + padata_work_init(pw, padata_mt_helper, data, 0); + list_add(&pw->pw_list, head); + } + spin_unlock(&padata_works_lock); + + return i; +} + static void padata_work_free(struct padata_work *pw) { lockdep_assert_held(&padata_works_lock); list_add(&pw->pw_list, &padata_free_works); } +static void __init padata_works_free(struct list_head *works) +{ + struct padata_work *cur, *next; + + if (list_empty(works)) + return; + + spin_lock(&padata_works_lock); + list_for_each_entry_safe(cur, next, works, pw_list) { + list_del(&cur->pw_list); + padata_work_free(cur); + } + spin_unlock(&padata_works_lock); +} + static void padata_parallel_worker(struct work_struct *parallel_work) { struct padata_work *pw = container_of(parallel_work, struct padata_work, @@ -168,7 +222,7 @@ int padata_do_parallel(struct padata_shell *ps, pw = padata_work_alloc(); spin_unlock(&padata_works_lock); if (pw) { - padata_work_init(pw, padata_parallel_worker, padata); + padata_work_init(pw, padata_parallel_worker, padata, 0); queue_work(pinst->parallel_wq, &pw->pw_work); } else { /* Maximum works limit exceeded, run in the current task. */ @@ -409,6 +463,98 @@ static int pd_setup_cpumasks(struct parallel_data *pd, return err; } +static void __init padata_mt_helper(struct work_struct *w) +{ + struct padata_work *pw = container_of(w, struct padata_work, pw_work); + struct padata_mt_job_state *ps = pw->pw_data; + struct padata_mt_job *job = ps->job; + bool done; + + spin_lock(&ps->lock); + + while (job->size > 0) { + unsigned long start, size, end; + + start = job->start; + /* So end is chunk size aligned if enough work remains. */ + size = roundup(start + 1, ps->chunk_size) - start; + size = min(size, job->size); + end = start + size; + + job->start = end; + job->size -= size; + + spin_unlock(&ps->lock); + job->thread_fn(start, end, job->fn_arg); + spin_lock(&ps->lock); + } + + ++ps->nworks_fini; + done = (ps->nworks_fini == ps->nworks); + spin_unlock(&ps->lock); + + if (done) + complete(&ps->completion); +} + +/** + * padata_do_multithreaded - run a multithreaded job + * @job: Description of the job. + * + * See the definition of struct padata_mt_job for more details. + */ +void __init padata_do_multithreaded(struct padata_mt_job *job) +{ + /* In case threads finish at different times. */ + static const unsigned long load_balance_factor = 4; + struct padata_work my_work, *pw; + struct padata_mt_job_state ps; + LIST_HEAD(works); + int nworks; + + if (job->size == 0) + return; + + /* Ensure at least one thread when size < min_chunk. */ + nworks = max(job->size / job->min_chunk, 1ul); + nworks = min(nworks, job->max_threads); + + if (nworks == 1) { + /* Single thread, no coordination needed, cut to the chase. */ + job->thread_fn(job->start, job->start + job->size, job->fn_arg); + return; + } + + spin_lock_init(&ps.lock); + init_completion(&ps.completion); + ps.job = job; + ps.nworks = padata_work_alloc_mt(nworks, &ps, &works); + ps.nworks_fini = 0; + + /* + * Chunk size is the amount of work a helper does per call to the + * thread function. Load balance large jobs between threads by + * increasing the number of chunks, guarantee at least the minimum + * chunk size from the caller, and honor the caller's alignment. + */ + ps.chunk_size = job->size / (ps.nworks * load_balance_factor); + ps.chunk_size = max(ps.chunk_size, job->min_chunk); + ps.chunk_size = roundup(ps.chunk_size, job->align); + + list_for_each_entry(pw, &works, pw_list) + queue_work(system_unbound_wq, &pw->pw_work); + + /* Use the current thread, which saves starting a workqueue worker. */ + padata_work_init(&my_work, padata_mt_helper, &ps, PADATA_WORK_ONSTACK); + padata_mt_helper(&my_work.pw_work); + + /* Wait for all the helpers to finish. */ + wait_for_completion(&ps.completion); + + destroy_work_on_stack(&my_work.pw_work); + padata_works_free(&works); +} + static void __padata_list_init(struct padata_list *pd_list) { INIT_LIST_HEAD(&pd_list->list); From patchwork Wed May 27 17:36:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Jordan X-Patchwork-Id: 11573655 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 35B4C14F6 for ; Wed, 27 May 2020 17:37:24 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 01ED620707 for ; Wed, 27 May 2020 17:37:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="reCN7ZDh" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 01ED620707 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 7C80B800BA; Wed, 27 May 2020 13:37:15 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 74FF5800B6; Wed, 27 May 2020 13:37:15 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 59F07800BA; Wed, 27 May 2020 13:37:15 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0009.hostedemail.com [216.40.44.9]) by kanga.kvack.org (Postfix) with ESMTP id 3C306800B6 for ; Wed, 27 May 2020 13:37:15 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id F05E112631 for ; Wed, 27 May 2020 17:37:14 +0000 (UTC) X-FDA: 76863205188.05.apple09_1001e8926d54 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin05.hostedemail.com (Postfix) with ESMTP id D8FCA18017FB5 for ; Wed, 27 May 2020 17:37:14 +0000 (UTC) X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,daniel.m.jordan@oracle.com,,RULES_HIT:30012:30034:30054:30056:30064:30070,0,RBL:141.146.126.78:@oracle.com:.lbl8.mailshell.net-62.18.0.100 64.10.201.10,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:ft,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:23,LUA_SUMMARY:none X-HE-Tag: apple09_1001e8926d54 X-Filterd-Recvd-Size: 6311 Received: from aserp2120.oracle.com (aserp2120.oracle.com [141.146.126.78]) by imf08.hostedemail.com (Postfix) with ESMTP for ; Wed, 27 May 2020 17:37:14 +0000 (UTC) Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04RHS8xU066133; Wed, 27 May 2020 17:36:32 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=yPUXFWPL94bqTXYWjhf36bOZIYPC2tWDc5RPRYWRQpc=; b=reCN7ZDhlWpd3nB6imCa52znFT7mP1fOUN2XCQQ631F1ma2oxX577K3URLMu6DcgEmYc 9SzOSPQUOj3SMYETsYmmw8Gl621nAz5lbRotfYPZF2vFTfB8aEpbbZvxKAwsTD2iAC4f uH9PUDI9zDyhtj82I2gJvjyomGX/+XFWkYJDEqdSIofBdYhajQmQtvs+KBoH05hu9m4v O8OX/i87vC0fKYZnKE3j6wRzs0TQlzC67GIUO0w5JQooN99R3qvXEGQhrRg/1h7/iKDO yl1QBJ8gcMuCPJfzXBLg2QEJF45uqhx78MNKx7H2ed7ngfom+HlWlCOWkP5x4Y1le2et 3A== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by aserp2120.oracle.com with ESMTP id 318xe1gubg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 27 May 2020 17:36:32 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04RHXdpC142867; Wed, 27 May 2020 17:36:32 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3020.oracle.com with ESMTP id 317dkutu4g-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 27 May 2020 17:36:31 +0000 Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 04RHaRuB012736; Wed, 27 May 2020 17:36:27 GMT Received: from localhost.localdomain (/98.229.125.203) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 27 May 2020 10:36:27 -0700 From: Daniel Jordan To: Andrew Morton , Herbert Xu , Steffen Klassert Cc: Alex Williamson , Alexander Duyck , Dan Williams , Dave Hansen , David Hildenbrand , Jason Gunthorpe , Jonathan Corbet , Josh Triplett , Kirill Tkhai , Michal Hocko , Pavel Machek , Pavel Tatashin , Peter Zijlstra , Randy Dunlap , Robert Elliott , Shile Zhang , Steven Sistare , Tejun Heo , Zi Yan , linux-crypto@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Daniel Jordan Subject: [PATCH v3 5/8] mm: don't track number of pages during deferred initialization Date: Wed, 27 May 2020 13:36:05 -0400 Message-Id: <20200527173608.2885243-6-daniel.m.jordan@oracle.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200527173608.2885243-1-daniel.m.jordan@oracle.com> References: <20200527173608.2885243-1-daniel.m.jordan@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9633 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 malwarescore=0 bulkscore=0 spamscore=0 suspectscore=0 mlxscore=0 adultscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005270137 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9633 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 mlxlogscore=999 adultscore=0 cotscore=-2147483648 mlxscore=0 bulkscore=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 malwarescore=0 clxscore=1015 impostorscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005270136 X-Rspamd-Queue-Id: D8FCA18017FB5 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Deferred page init used to report the number of pages initialized: node 0 initialised, 32439114 pages in 97ms Tracking this makes the code more complicated when using multiple threads. Given that the statistic probably has limited value, especially since a zone grows on demand so that the page count can vary, just remove it. The boot message now looks like node 0 deferred pages initialised in 97ms Signed-off-by: Daniel Jordan Suggested-by: Alexander Duyck Reviewed-by: Alexander Duyck --- mm/page_alloc.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index d0c0d9364aa6d..d64f3027fdfa6 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1819,7 +1819,7 @@ static int __init deferred_init_memmap(void *data) { pg_data_t *pgdat = data; const struct cpumask *cpumask = cpumask_of_node(pgdat->node_id); - unsigned long spfn = 0, epfn = 0, nr_pages = 0; + unsigned long spfn = 0, epfn = 0; unsigned long first_init_pfn, flags; unsigned long start = jiffies; struct zone *zone; @@ -1868,15 +1868,15 @@ static int __init deferred_init_memmap(void *data) * allocator. */ while (spfn < epfn) { - nr_pages += deferred_init_maxorder(&i, zone, &spfn, &epfn); + deferred_init_maxorder(&i, zone, &spfn, &epfn); cond_resched(); } zone_empty: /* Sanity check that the next zone really is unpopulated */ WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone)); - pr_info("node %d initialised, %lu pages in %ums\n", - pgdat->node_id, nr_pages, jiffies_to_msecs(jiffies - start)); + pr_info("node %d deferred pages initialised in %ums\n", + pgdat->node_id, jiffies_to_msecs(jiffies - start)); pgdat_init_report_one_done(); return 0; From patchwork Wed May 27 17:36:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Jordan X-Patchwork-Id: 11573653 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DB66414F6 for ; Wed, 27 May 2020 17:37:21 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 99F4A20707 for ; Wed, 27 May 2020 17:37:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="lLMgPf12" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 99F4A20707 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 57C2E800B9; Wed, 27 May 2020 13:37:14 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 4DF90800B6; Wed, 27 May 2020 13:37:14 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 37DDB800B9; Wed, 27 May 2020 13:37:14 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0070.hostedemail.com [216.40.44.70]) by kanga.kvack.org (Postfix) with ESMTP id 15AA1800B6 for ; Wed, 27 May 2020 13:37:14 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id CEF9E6C03 for ; Wed, 27 May 2020 17:37:13 +0000 (UTC) X-FDA: 76863205146.05.heart18_620397026d54 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin05.hostedemail.com (Postfix) with ESMTP id B7DC218017FC3 for ; Wed, 27 May 2020 17:37:13 +0000 (UTC) X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,daniel.m.jordan@oracle.com,,RULES_HIT:30005:30034:30045:30054:30055:30064:30070,0,RBL:156.151.31.86:@oracle.com:.lbl8.mailshell.net-64.10.201.10 62.18.0.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:ft,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:22,LUA_SUMMARY:none X-HE-Tag: heart18_620397026d54 X-Filterd-Recvd-Size: 15460 Received: from userp2130.oracle.com (userp2130.oracle.com [156.151.31.86]) by imf24.hostedemail.com (Postfix) with ESMTP for ; Wed, 27 May 2020 17:37:12 +0000 (UTC) Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04RHRq3C163169; Wed, 27 May 2020 17:36:33 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=JlxXZ4X1BdaHJxNlLI/Hshp9P1omC4cUzGl3XaKVTXY=; b=lLMgPf12p2yyoLAfgSIT+Dg9crcbDPwu1ukgy3aLFV7ZaD/ael20TxYFwOVBwY7/se4V 38gQv8WgCiuWGTDgBlp+IwZhith1E2oiY5F+PI7iAPvCUVThSaagZ+/d5qAIO34/ZUEU IQx3XCfOU8En5eDy/dsfDPsHQhK3B2e+D8jP++Z0WRi1Ik2t+VYT30OWcClIagEXfgXe e8/wOtY2nk0hC+Hq0dS0SlshibhO+NqXsRzrpQCTZ6B/G/8nBJ2ZYAhbKFS0jaXWrO0F DM+SnaUUnOiRKr+o4LCgNHPE//5EvsCKVox2nOy3dnyXOB0iH6KLKLG79Lc95KIeosts 1Q== Received: from aserp3020.oracle.com (aserp3020.oracle.com [141.146.126.70]) by userp2130.oracle.com with ESMTP id 316u8r0u1d-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 27 May 2020 17:36:33 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04RHXbVQ105379; Wed, 27 May 2020 17:36:32 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3020.oracle.com with ESMTP id 317j5sfs7c-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 27 May 2020 17:36:32 +0000 Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 04RHaT2t013696; Wed, 27 May 2020 17:36:29 GMT Received: from localhost.localdomain (/98.229.125.203) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 27 May 2020 10:36:29 -0700 From: Daniel Jordan To: Andrew Morton , Herbert Xu , Steffen Klassert Cc: Alex Williamson , Alexander Duyck , Dan Williams , Dave Hansen , David Hildenbrand , Jason Gunthorpe , Jonathan Corbet , Josh Triplett , Kirill Tkhai , Michal Hocko , Pavel Machek , Pavel Tatashin , Peter Zijlstra , Randy Dunlap , Robert Elliott , Shile Zhang , Steven Sistare , Tejun Heo , Zi Yan , linux-crypto@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Daniel Jordan Subject: [PATCH v3 6/8] mm: parallelize deferred_init_memmap() Date: Wed, 27 May 2020 13:36:06 -0400 Message-Id: <20200527173608.2885243-7-daniel.m.jordan@oracle.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200527173608.2885243-1-daniel.m.jordan@oracle.com> References: <20200527173608.2885243-1-daniel.m.jordan@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9633 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 spamscore=0 suspectscore=0 mlxlogscore=999 mlxscore=0 adultscore=0 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005270137 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9633 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxscore=0 priorityscore=1501 spamscore=0 cotscore=-2147483648 suspectscore=0 phishscore=0 clxscore=1015 mlxlogscore=999 bulkscore=0 adultscore=0 lowpriorityscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005270136 X-Rspamd-Queue-Id: B7DC218017FC3 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Deferred struct page init is a significant bottleneck in kernel boot. Optimizing it maximizes availability for large-memory systems and allows spinning up short-lived VMs as needed without having to leave them running. It also benefits bare metal machines hosting VMs that are sensitive to downtime. In projects such as VMM Fast Restart[1], where guest state is preserved across kexec reboot, it helps prevent application and network timeouts in the guests. Multithread to take full advantage of system memory bandwidth. The maximum number of threads is capped at the number of CPUs on the node because speedups always improve with additional threads on every system tested, and at this phase of boot, the system is otherwise idle and waiting on page init to finish. Helper threads operate on section-aligned ranges to both avoid false sharing when setting the pageblock's migrate type and to avoid accessing uninitialized buddy pages, though max order alignment is enough for the latter. The minimum chunk size is also a section. There was benefit to using multiple threads even on relatively small memory (1G) systems, and this is the smallest size that the alignment allows. The time (milliseconds) is the slowest node to initialize since boot blocks until all nodes finish. intel_pstate is loaded in active mode without hwp and with turbo enabled, and intel_idle is active as well. Intel(R) Xeon(R) Platinum 8167M CPU @ 2.00GHz (Skylake, bare metal) 2 nodes * 26 cores * 2 threads = 104 CPUs 384G/node = 768G memory kernel boot deferred init ------------------------ ------------------------ node% (thr) speedup time_ms (stdev) speedup time_ms (stdev) ( 0) -- 4089.7 ( 8.1) -- 1785.7 ( 7.6) 2% ( 1) 1.7% 4019.3 ( 1.5) 3.8% 1717.7 ( 11.8) 12% ( 6) 34.9% 2662.7 ( 2.9) 79.9% 359.3 ( 0.6) 25% ( 13) 39.9% 2459.0 ( 3.6) 91.2% 157.0 ( 0.0) 37% ( 19) 39.2% 2485.0 ( 29.7) 90.4% 172.0 ( 28.6) 50% ( 26) 39.3% 2482.7 ( 25.7) 90.3% 173.7 ( 30.0) 75% ( 39) 39.0% 2495.7 ( 5.5) 89.4% 190.0 ( 1.0) 100% ( 52) 40.2% 2443.7 ( 3.8) 92.3% 138.0 ( 1.0) Intel(R) Xeon(R) CPU E5-2699C v4 @ 2.20GHz (Broadwell, kvm guest) 1 node * 16 cores * 2 threads = 32 CPUs 192G/node = 192G memory kernel boot deferred init ------------------------ ------------------------ node% (thr) speedup time_ms (stdev) speedup time_ms (stdev) ( 0) -- 1988.7 ( 9.6) -- 1096.0 ( 11.5) 3% ( 1) 1.1% 1967.0 ( 17.6) 0.3% 1092.7 ( 11.0) 12% ( 4) 41.1% 1170.3 ( 14.2) 73.8% 287.0 ( 3.6) 25% ( 8) 47.1% 1052.7 ( 21.9) 83.9% 177.0 ( 13.5) 38% ( 12) 48.9% 1016.3 ( 12.1) 86.8% 144.7 ( 1.5) 50% ( 16) 48.9% 1015.7 ( 8.1) 87.8% 134.0 ( 4.4) 75% ( 24) 49.1% 1012.3 ( 3.1) 88.1% 130.3 ( 2.3) 100% ( 32) 49.5% 1004.0 ( 5.3) 88.5% 125.7 ( 2.1) Intel(R) Xeon(R) CPU E5-2699 v3 @ 2.30GHz (Haswell, bare metal) 2 nodes * 18 cores * 2 threads = 72 CPUs 128G/node = 256G memory kernel boot deferred init ------------------------ ------------------------ node% (thr) speedup time_ms (stdev) speedup time_ms (stdev) ( 0) -- 1680.0 ( 4.6) -- 627.0 ( 4.0) 3% ( 1) 0.3% 1675.7 ( 4.5) -0.2% 628.0 ( 3.6) 11% ( 4) 25.6% 1250.7 ( 2.1) 67.9% 201.0 ( 0.0) 25% ( 9) 30.7% 1164.0 ( 17.3) 81.8% 114.3 ( 17.7) 36% ( 13) 31.4% 1152.7 ( 10.8) 84.0% 100.3 ( 17.9) 50% ( 18) 31.5% 1150.7 ( 9.3) 83.9% 101.0 ( 14.1) 75% ( 27) 31.7% 1148.0 ( 5.6) 84.5% 97.3 ( 6.4) 100% ( 36) 32.0% 1142.3 ( 4.0) 85.6% 90.0 ( 1.0) AMD EPYC 7551 32-Core Processor (Zen, kvm guest) 1 node * 8 cores * 2 threads = 16 CPUs 64G/node = 64G memory kernel boot deferred init ------------------------ ------------------------ node% (thr) speedup time_ms (stdev) speedup time_ms (stdev) ( 0) -- 1029.3 ( 25.1) -- 240.7 ( 1.5) 6% ( 1) -0.6% 1036.0 ( 7.8) -2.2% 246.0 ( 0.0) 12% ( 2) 11.8% 907.7 ( 8.6) 44.7% 133.0 ( 1.0) 25% ( 4) 13.9% 886.0 ( 10.6) 62.6% 90.0 ( 6.0) 38% ( 6) 17.8% 845.7 ( 14.2) 69.1% 74.3 ( 3.8) 50% ( 8) 16.8% 856.0 ( 22.1) 72.9% 65.3 ( 5.7) 75% ( 12) 15.4% 871.0 ( 29.2) 79.8% 48.7 ( 7.4) 100% ( 16) 21.0% 813.7 ( 21.0) 80.5% 47.0 ( 5.2) Server-oriented distros that enable deferred page init sometimes run in small VMs, and they still benefit even though the fraction of boot time saved is smaller: AMD EPYC 7551 32-Core Processor (Zen, kvm guest) 1 node * 2 cores * 2 threads = 4 CPUs 16G/node = 16G memory kernel boot deferred init ------------------------ ------------------------ node% (thr) speedup time_ms (stdev) speedup time_ms (stdev) ( 0) -- 716.0 ( 14.0) -- 49.7 ( 0.6) 25% ( 1) 1.8% 703.0 ( 5.3) -4.0% 51.7 ( 0.6) 50% ( 2) 1.6% 704.7 ( 1.2) 43.0% 28.3 ( 0.6) 75% ( 3) 2.7% 696.7 ( 13.1) 49.7% 25.0 ( 0.0) 100% ( 4) 4.1% 687.0 ( 10.4) 55.7% 22.0 ( 0.0) Intel(R) Xeon(R) CPU E5-2699 v3 @ 2.30GHz (Haswell, kvm guest) 1 node * 2 cores * 2 threads = 4 CPUs 14G/node = 14G memory kernel boot deferred init ------------------------ ------------------------ node% (thr) speedup time_ms (stdev) speedup time_ms (stdev) ( 0) -- 787.7 ( 6.4) -- 122.3 ( 0.6) 25% ( 1) 0.2% 786.3 ( 10.8) -2.5% 125.3 ( 2.1) 50% ( 2) 5.9% 741.0 ( 13.9) 37.6% 76.3 ( 19.7) 75% ( 3) 8.3% 722.0 ( 19.0) 49.9% 61.3 ( 3.2) 100% ( 4) 9.3% 714.7 ( 9.5) 56.4% 53.3 ( 1.5) On Josh's 96-CPU and 192G memory system: Without this patch series: [ 0.487132] node 0 initialised, 23398907 pages in 292ms [ 0.499132] node 1 initialised, 24189223 pages in 304ms ... [ 0.629376] Run /sbin/init as init process With this patch series: [ 0.231435] node 1 initialised, 24189223 pages in 32ms [ 0.236718] node 0 initialised, 23398907 pages in 36ms [1] https://static.sched.com/hosted_files/kvmforum2019/66/VMM-fast-restart_kvmforum2019.pdf Signed-off-by: Daniel Jordan Tested-by: Josh Triplett Reviewed-by: Alexander Duyck --- mm/Kconfig | 6 +++--- mm/page_alloc.c | 46 ++++++++++++++++++++++++++++++++++++++++------ 2 files changed, 43 insertions(+), 9 deletions(-) diff --git a/mm/Kconfig b/mm/Kconfig index c1acc34c1c358..04c1da3f9f44c 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -750,13 +750,13 @@ config DEFERRED_STRUCT_PAGE_INIT depends on SPARSEMEM depends on !NEED_PER_CPU_KM depends on 64BIT + select PADATA help Ordinarily all struct pages are initialised during early boot in a single thread. On very large machines this can take a considerable amount of time. If this option is set, large machines will bring up - a subset of memmap at boot and then initialise the rest in parallel - by starting one-off "pgdatinitX" kernel thread for each node X. This - has a potential performance impact on processes running early in the + a subset of memmap at boot and then initialise the rest in parallel. + This has a potential performance impact on tasks running early in the lifetime of the system until these kthreads finish the initialisation. diff --git a/mm/page_alloc.c b/mm/page_alloc.c index d64f3027fdfa6..1d47016849531 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -68,6 +68,7 @@ #include #include #include +#include #include #include @@ -1814,6 +1815,26 @@ deferred_init_maxorder(u64 *i, struct zone *zone, unsigned long *start_pfn, return nr_pages; } +static void __init +deferred_init_memmap_chunk(unsigned long start_pfn, unsigned long end_pfn, + void *arg) +{ + unsigned long spfn, epfn; + struct zone *zone = arg; + u64 i; + + deferred_init_mem_pfn_range_in_zone(&i, zone, &spfn, &epfn, start_pfn); + + /* + * Initialize and free pages in MAX_ORDER sized increments so that we + * can avoid introducing any issues with the buddy allocator. + */ + while (spfn < end_pfn) { + deferred_init_maxorder(&i, zone, &spfn, &epfn); + cond_resched(); + } +} + /* Initialise remaining memory on a node */ static int __init deferred_init_memmap(void *data) { @@ -1823,7 +1844,7 @@ static int __init deferred_init_memmap(void *data) unsigned long first_init_pfn, flags; unsigned long start = jiffies; struct zone *zone; - int zid; + int zid, max_threads; u64 i; /* Bind memory initialisation thread to a local node if possible */ @@ -1863,13 +1884,26 @@ static int __init deferred_init_memmap(void *data) goto zone_empty; /* - * Initialize and free pages in MAX_ORDER sized increments so - * that we can avoid introducing any issues with the buddy - * allocator. + * More CPUs always led to greater speedups on tested systems, up to + * all the nodes' CPUs. Use all since the system is otherwise idle now. */ + max_threads = max(cpumask_weight(cpumask), 1u); + while (spfn < epfn) { - deferred_init_maxorder(&i, zone, &spfn, &epfn); - cond_resched(); + unsigned long epfn_align = ALIGN(epfn, PAGES_PER_SECTION); + struct padata_mt_job job = { + .thread_fn = deferred_init_memmap_chunk, + .fn_arg = zone, + .start = spfn, + .size = epfn_align - spfn, + .align = PAGES_PER_SECTION, + .min_chunk = PAGES_PER_SECTION, + .max_threads = max_threads, + }; + + padata_do_multithreaded(&job); + deferred_init_mem_pfn_range_in_zone(&i, zone, &spfn, &epfn, + epfn_align); } zone_empty: /* Sanity check that the next zone really is unpopulated */ From patchwork Wed May 27 17:36:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Jordan X-Patchwork-Id: 11573675 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 41B4A14C0 for ; Wed, 27 May 2020 17:38:47 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0EEB120835 for ; Wed, 27 May 2020 17:38:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="KPhP5B3V" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0EEB120835 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 306F6800B6; Wed, 27 May 2020 13:38:46 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 2DFB780010; Wed, 27 May 2020 13:38:46 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1F52F800B6; Wed, 27 May 2020 13:38:46 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0112.hostedemail.com [216.40.44.112]) by kanga.kvack.org (Postfix) with ESMTP id 014D880010 for ; Wed, 27 May 2020 13:38:45 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id B1A748248076 for ; Wed, 27 May 2020 17:38:45 +0000 (UTC) X-FDA: 76863209010.20.prose41_5d0281d26d54 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin20.hostedemail.com (Postfix) with ESMTP id 96CF718025896 for ; Wed, 27 May 2020 17:38:45 +0000 (UTC) X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,daniel.m.jordan@oracle.com,,RULES_HIT:30054:30064:30090,0,RBL:156.151.31.86:@oracle.com:.lbl8.mailshell.net-64.10.201.10 62.18.0.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:ft,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:25,LUA_SUMMARY:none X-HE-Tag: prose41_5d0281d26d54 X-Filterd-Recvd-Size: 7256 Received: from userp2130.oracle.com (userp2130.oracle.com [156.151.31.86]) by imf26.hostedemail.com (Postfix) with ESMTP for ; Wed, 27 May 2020 17:38:43 +0000 (UTC) Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04RHbsA9183555; Wed, 27 May 2020 17:38:34 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=Ve6Yl+N+FKzwOLaiMokVozZ/Xsbw/tJM0PDnM1M2bLw=; b=KPhP5B3VnbXMOtbNZ54G+vZILsYNlQp8UP60R5QsSphEho41GTVCzv2gZBwR3Q2cAM2J jWV5TLidJNGGMhuuZbXNYktjTfecnE3t6AuUHS0yHt2nIvrD7dzijDNTOkcp/7W+jdA6 j1KaY+jka0JetgwQpY9rOESXuosDJIby3aijphchgW9NjJX55V10NWaCLgcN+4JXqfxn tc1lix3WUIzyHqY9IMFORc4wWPPeolL6d5/WPzmfQ8oEHGMAHUuVB7u22DuirIs5o3Q9 C9eUmrrk0BdUi7FctPpsuUbfX/b44oUrfeS3deWK4CFXNU5WCEUZBJo/WrDTwCSB64Mu ew== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by userp2130.oracle.com with ESMTP id 316u8r0uaa-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 27 May 2020 17:38:34 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04RHX4l4195469; Wed, 27 May 2020 17:36:34 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3030.oracle.com with ESMTP id 317ddr6jxm-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 27 May 2020 17:36:34 +0000 Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 04RHaViR013711; Wed, 27 May 2020 17:36:32 GMT Received: from localhost.localdomain (/98.229.125.203) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 27 May 2020 10:36:31 -0700 From: Daniel Jordan To: Andrew Morton , Herbert Xu , Steffen Klassert Cc: Alex Williamson , Alexander Duyck , Dan Williams , Dave Hansen , David Hildenbrand , Jason Gunthorpe , Jonathan Corbet , Josh Triplett , Kirill Tkhai , Michal Hocko , Pavel Machek , Pavel Tatashin , Peter Zijlstra , Randy Dunlap , Robert Elliott , Shile Zhang , Steven Sistare , Tejun Heo , Zi Yan , linux-crypto@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Daniel Jordan Subject: [PATCH v3 7/8] mm: make deferred init's max threads arch-specific Date: Wed, 27 May 2020 13:36:07 -0400 Message-Id: <20200527173608.2885243-8-daniel.m.jordan@oracle.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200527173608.2885243-1-daniel.m.jordan@oracle.com> References: <20200527173608.2885243-1-daniel.m.jordan@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9633 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 bulkscore=0 mlxscore=0 phishscore=0 adultscore=0 suspectscore=2 spamscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005270137 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9633 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxscore=0 priorityscore=1501 spamscore=0 cotscore=-2147483648 suspectscore=2 phishscore=0 clxscore=1015 mlxlogscore=999 bulkscore=0 adultscore=0 lowpriorityscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005270137 X-Rspamd-Queue-Id: 96CF718025896 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Using padata during deferred init has only been tested on x86, so for now limit it to this architecture. If another arch wants this, it can find the max thread limit that's best for it and override deferred_page_init_max_threads(). Signed-off-by: Daniel Jordan Tested-by: Josh Triplett --- arch/x86/mm/init_64.c | 12 ++++++++++++ include/linux/memblock.h | 3 +++ mm/page_alloc.c | 13 ++++++++----- 3 files changed, 23 insertions(+), 5 deletions(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 8b5f73f5e207c..2d749ec12ea8a 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1260,6 +1260,18 @@ void __init mem_init(void) mem_init_print_info(NULL); } +#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT +int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask) +{ + /* + * More CPUs always led to greater speedups on tested systems, up to + * all the nodes' CPUs. Use all since the system is otherwise idle + * now. + */ + return max_t(int, cpumask_weight(node_cpumask), 1); +} +#endif + int kernel_set_to_readonly; void mark_rodata_ro(void) diff --git a/include/linux/memblock.h b/include/linux/memblock.h index 6bc37a731d27b..2b289df44194f 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -275,6 +275,9 @@ void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone, #define for_each_free_mem_pfn_range_in_zone_from(i, zone, p_start, p_end) \ for (; i != U64_MAX; \ __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end)) + +int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask); + #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ /** diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 1d47016849531..329fd1a809c59 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1835,6 +1835,13 @@ deferred_init_memmap_chunk(unsigned long start_pfn, unsigned long end_pfn, } } +/* An arch may override for more concurrency. */ +__weak int __init +deferred_page_init_max_threads(const struct cpumask *node_cpumask) +{ + return 1; +} + /* Initialise remaining memory on a node */ static int __init deferred_init_memmap(void *data) { @@ -1883,11 +1890,7 @@ static int __init deferred_init_memmap(void *data) first_init_pfn)) goto zone_empty; - /* - * More CPUs always led to greater speedups on tested systems, up to - * all the nodes' CPUs. Use all since the system is otherwise idle now. - */ - max_threads = max(cpumask_weight(cpumask), 1u); + max_threads = deferred_page_init_max_threads(cpumask); while (spfn < epfn) { unsigned long epfn_align = ALIGN(epfn, PAGES_PER_SECTION); From patchwork Wed May 27 17:36:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Jordan X-Patchwork-Id: 11573657 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3B84714C0 for ; Wed, 27 May 2020 17:37:27 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id EEF6820707 for ; Wed, 27 May 2020 17:37:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="aYPx7daN" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EEF6820707 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id CA415800BB; Wed, 27 May 2020 13:37:25 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id C563C800B6; Wed, 27 May 2020 13:37:25 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B69F5800BB; Wed, 27 May 2020 13:37:25 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0103.hostedemail.com [216.40.44.103]) by kanga.kvack.org (Postfix) with ESMTP id 9E335800B6 for ; Wed, 27 May 2020 13:37:25 -0400 (EDT) Received: from smtpin06.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 63280181AC9B6 for ; Wed, 27 May 2020 17:37:25 +0000 (UTC) X-FDA: 76863205650.06.suit32_210cff626d54 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin06.hostedemail.com (Postfix) with ESMTP id 4C12A100F63E7 for ; Wed, 27 May 2020 17:37:25 +0000 (UTC) X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,daniel.m.jordan@oracle.com,,RULES_HIT:30012:30034:30045:30051:30054:30064:30090,0,RBL:141.146.126.78:@oracle.com:.lbl8.mailshell.net-64.10.201.10 62.18.0.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:ft,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:25,LUA_SUMMARY:none X-HE-Tag: suit32_210cff626d54 X-Filterd-Recvd-Size: 7711 Received: from aserp2120.oracle.com (aserp2120.oracle.com [141.146.126.78]) by imf39.hostedemail.com (Postfix) with ESMTP for ; Wed, 27 May 2020 17:37:24 +0000 (UTC) Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04RHSRtE066275; Wed, 27 May 2020 17:36:36 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=i/6XgwHHHOgoW5TU+a/aVclmsApnQYa1z6EDveHJZOY=; b=aYPx7daNvdWh1SteBGYuCo3aP0mPn56fA8eCky3L0YZ3J+CXbm344uPti2Pcb930sz/m aD18jOEtXBMLjiCLVBuqTch+QKSTWWX5GyG2aK6xiFFlWgwqDhC+nAG/qNOhBLbVst1C 36bhTB/wrIuLgdLKibdqUXXEtbOHHOR5ZIfRSTA30cvhiRQSJywhRcuh3lgvpeBWgyld 0fszqEapBamiaE+VOApwXSwqnVvl4iruf/RuJlZRHO1TLTJbKF/EPwPGimUjZl4COvnx XhB9u1wf72kFAwRgIMcDHlEOyCIHtSTVlo1MMaOeKmG874IqN07GmRFCBICOrj+QQJ7E nQ== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by aserp2120.oracle.com with ESMTP id 318xe1gubs-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 27 May 2020 17:36:36 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04RHX4lq195410; Wed, 27 May 2020 17:36:36 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserp3030.oracle.com with ESMTP id 317ddr6jyg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 27 May 2020 17:36:36 +0000 Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 04RHaYCm012759; Wed, 27 May 2020 17:36:34 GMT Received: from localhost.localdomain (/98.229.125.203) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 27 May 2020 10:36:33 -0700 From: Daniel Jordan To: Andrew Morton , Herbert Xu , Steffen Klassert Cc: Alex Williamson , Alexander Duyck , Dan Williams , Dave Hansen , David Hildenbrand , Jason Gunthorpe , Jonathan Corbet , Josh Triplett , Kirill Tkhai , Michal Hocko , Pavel Machek , Pavel Tatashin , Peter Zijlstra , Randy Dunlap , Robert Elliott , Shile Zhang , Steven Sistare , Tejun Heo , Zi Yan , linux-crypto@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Daniel Jordan Subject: [PATCH v3 8/8] padata: document multithreaded jobs Date: Wed, 27 May 2020 13:36:08 -0400 Message-Id: <20200527173608.2885243-9-daniel.m.jordan@oracle.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200527173608.2885243-1-daniel.m.jordan@oracle.com> References: <20200527173608.2885243-1-daniel.m.jordan@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9633 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 bulkscore=0 mlxscore=0 phishscore=0 adultscore=0 suspectscore=0 spamscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005270137 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9633 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 mlxlogscore=999 adultscore=0 cotscore=-2147483648 mlxscore=0 bulkscore=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 malwarescore=0 clxscore=1015 impostorscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005270136 X-Rspamd-Queue-Id: 4C12A100F63E7 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Add Documentation for multithreaded jobs. Signed-off-by: Daniel Jordan Tested-by: Josh Triplett --- Documentation/core-api/padata.rst | 41 +++++++++++++++++++++++-------- 1 file changed, 31 insertions(+), 10 deletions(-) diff --git a/Documentation/core-api/padata.rst b/Documentation/core-api/padata.rst index 9a24c111781d9..0830e5b0e8211 100644 --- a/Documentation/core-api/padata.rst +++ b/Documentation/core-api/padata.rst @@ -4,23 +4,26 @@ The padata parallel execution mechanism ======================================= -:Date: December 2019 +:Date: May 2020 Padata is a mechanism by which the kernel can farm jobs out to be done in -parallel on multiple CPUs while retaining their ordering. It was developed for -use with the IPsec code, which needs to be able to perform encryption and -decryption on large numbers of packets without reordering those packets. The -crypto developers made a point of writing padata in a sufficiently general -fashion that it could be put to other uses as well. +parallel on multiple CPUs while optionally retaining their ordering. -Usage -===== +It was originally developed for IPsec, which needs to perform encryption and +decryption on large numbers of packets without reordering those packets. This +is currently the sole consumer of padata's serialized job support. + +Padata also supports multithreaded jobs, splitting up the job evenly while load +balancing and coordinating between threads. + +Running Serialized Jobs +======================= Initializing ------------ -The first step in using padata is to set up a padata_instance structure for -overall control of how jobs are to be run:: +The first step in using padata to run serialized jobs is to set up a +padata_instance structure for overall control of how jobs are to be run:: #include @@ -162,6 +165,24 @@ functions that correspond to the allocation in reverse:: It is the user's responsibility to ensure all outstanding jobs are complete before any of the above are called. +Running Multithreaded Jobs +========================== + +A multithreaded job has a main thread and zero or more helper threads, with the +main thread participating in the job and then waiting until all helpers have +finished. padata splits the job into units called chunks, where a chunk is a +piece of the job that one thread completes in one call to the thread function. + +A user has to do three things to run a multithreaded job. First, describe the +job by defining a padata_mt_job structure, which is explained in the Interface +section. This includes a pointer to the thread function, which padata will +call each time it assigns a job chunk to a thread. Then, define the thread +function, which accepts three arguments, ``start``, ``end``, and ``arg``, where +the first two delimit the range that the thread operates on and the last is a +pointer to the job's shared state, if any. Prepare the shared state, which is +typically allocated on the main thread's stack. Last, call +padata_do_multithreaded(), which will return once the job is finished. + Interface =========