Message ID | 20190927234008.11513-6-leonardo@linux.ibm.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
Return-Path: <SRS0=VA16=XW=kvack.org=owner-linux-mm@kernel.org> 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 581EE1800 for <patchwork-linux-mm@patchwork.kernel.org>; Fri, 27 Sep 2019 23:40:59 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2B57321841 for <patchwork-linux-mm@patchwork.kernel.org>; Fri, 27 Sep 2019 23:40:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2B57321841 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 4E70C8E000A; Fri, 27 Sep 2019 19:40:58 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 470868E0009; Fri, 27 Sep 2019 19:40:58 -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 2E9EC8E000A; Fri, 27 Sep 2019 19:40:58 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0156.hostedemail.com [216.40.44.156]) by kanga.kvack.org (Postfix) with ESMTP id 0E5D78E0001 for <linux-mm@kvack.org>; Fri, 27 Sep 2019 19:40:58 -0400 (EDT) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id 98E3E824376E for <linux-mm@kvack.org>; Fri, 27 Sep 2019 23:40:57 +0000 (UTC) X-FDA: 75982323354.22.crow75_5f9da8ab9e936 X-Spam-Summary: 2,0,0,99785fde1818b9f0,d41d8cd98f00b204,leonardo@linux.ibm.com,:linuxppc-dev@lists.ozlabs.org:linux-kernel@vger.kernel.org:kvm-ppc@vger.kernel.org:linux-arch@vger.kernel.org::leonardo@linux.ibm.com:benh@kernel.crashing.org:paulus@samba.org:mpe@ellerman.id.au:arnd@arndb.de:aneesh.kumar@linux.ibm.com:christophe.leroy@c-s.fr:akpm@linux-foundation.org:dan.j.williams@intel.com:npiggin@gmail.com:mahesh@linux.vnet.ibm.com:allison@lohutok.net:tglx@linutronix.de:ganeshgr@linux.ibm.com:rppt@linux.ibm.com:yuehaibing@huawei.com:gregkh@linuxfoundation.org:ira.weiny@intel.com:jgg@ziepe.ca:jhubbard@nvidia.com:keith.busch@intel.com,RULES_HIT:41:355:379:541:800:960:973:988:989:1260:1261:1311:1314:1345:1359:1437:1515:1535:1541:1711:1730:1747:1777:1792:2393:2559:2562:3138:3139:3140:3141:3142:3352:3865:5007:6261:6742:6743:10004:11026:11658:11914:12043:12048:12296:12297:12438:12555:12895:13069:13255:13311:13357:13894:14096:14181:14384:14394:14721:21080:21324:21451:21627:30051:3005 4,0,RBL: X-HE-Tag: crow75_5f9da8ab9e936 X-Filterd-Recvd-Size: 5504 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by imf15.hostedemail.com (Postfix) with ESMTP for <linux-mm@kvack.org>; Fri, 27 Sep 2019 23:40:56 +0000 (UTC) Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x8RNbUEF079996; Fri, 27 Sep 2019 19:40:46 -0400 Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 2v9umg8vqg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 27 Sep 2019 19:40:46 -0400 Received: from m0098410.ppops.net (m0098410.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.27/8.16.0.27) with SMTP id x8RNejHa084360; Fri, 27 Sep 2019 19:40:45 -0400 Received: from ppma03dal.us.ibm.com (b.bd.3ea9.ip4.static.sl-reverse.com [169.62.189.11]) by mx0a-001b2d01.pphosted.com with ESMTP id 2v9umg8vqb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 27 Sep 2019 19:40:45 -0400 Received: from pps.filterd (ppma03dal.us.ibm.com [127.0.0.1]) by ppma03dal.us.ibm.com (8.16.0.27/8.16.0.27) with SMTP id x8RNeONe023855; Fri, 27 Sep 2019 23:40:44 GMT Received: from b01cxnp23034.gho.pok.ibm.com (b01cxnp23034.gho.pok.ibm.com [9.57.198.29]) by ppma03dal.us.ibm.com with ESMTP id 2v5bg8b708-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 27 Sep 2019 23:40:44 +0000 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp23034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x8RNehoJ43581784 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 27 Sep 2019 23:40:44 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D43C0112063; Fri, 27 Sep 2019 23:40:43 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3A0DC112062; Fri, 27 Sep 2019 23:40:40 +0000 (GMT) Received: from LeoBras.aus.stglabs.ibm.com (unknown [9.18.235.58]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Fri, 27 Sep 2019 23:40:40 +0000 (GMT) From: Leonardo Bras <leonardo@linux.ibm.com> To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, kvm-ppc@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org Cc: Leonardo Bras <leonardo@linux.ibm.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, Michael Ellerman <mpe@ellerman.id.au>, Arnd Bergmann <arnd@arndb.de>, "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>, Christophe Leroy <christophe.leroy@c-s.fr>, Andrew Morton <akpm@linux-foundation.org>, Dan Williams <dan.j.williams@intel.com>, Nicholas Piggin <npiggin@gmail.com>, Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>, Allison Randal <allison@lohutok.net>, Thomas Gleixner <tglx@linutronix.de>, Ganesh Goudar <ganeshgr@linux.ibm.com>, Mike Rapoport <rppt@linux.ibm.com>, YueHaibing <yuehaibing@huawei.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Ira Weiny <ira.weiny@intel.com>, Jason Gunthorpe <jgg@ziepe.ca>, John Hubbard <jhubbard@nvidia.com>, Keith Busch <keith.busch@intel.com> Subject: [PATCH v4 05/11] powerpc/perf: Applies counting method to monitor lockless pgtbl walks Date: Fri, 27 Sep 2019 20:40:02 -0300 Message-Id: <20190927234008.11513-6-leonardo@linux.ibm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190927234008.11513-1-leonardo@linux.ibm.com> References: <20190927234008.11513-1-leonardo@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-09-27_09:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=989 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1909270205 Content-Transfer-Encoding: quoted-printable 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: <linux-mm.kvack.org> |
Series |
Introduces new count-based method for monitoring lockless pagetable walks
|
expand
|
diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c index c84bbd4298a0..9d76194a2a8f 100644 --- a/arch/powerpc/perf/callchain.c +++ b/arch/powerpc/perf/callchain.c @@ -113,16 +113,18 @@ static int read_user_stack_slow(void __user *ptr, void *buf, int nb) int ret = -EFAULT; pgd_t *pgdir; pte_t *ptep, pte; + struct mm_struct *mm = current->mm; unsigned shift; unsigned long addr = (unsigned long) ptr; unsigned long offset; unsigned long pfn, flags; void *kaddr; - pgdir = current->mm->pgd; + pgdir = mm->pgd; if (!pgdir) return -EFAULT; + start_lockless_pgtbl_walk(mm); local_irq_save(flags); ptep = find_current_mm_pte(pgdir, addr, NULL, &shift); if (!ptep) @@ -146,6 +148,7 @@ static int read_user_stack_slow(void __user *ptr, void *buf, int nb) ret = 0; err_out: local_irq_restore(flags); + end_lockless_pgtbl_walk(mm); return ret; }
Applies the counting-based method for monitoring lockless pgtable walks on read_user_stack_slow. Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com> --- arch/powerpc/perf/callchain.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)