From patchwork Wed Apr 29 22:56:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Shi X-Patchwork-Id: 11518929 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 302AC912 for ; Wed, 29 Apr 2020 22:56:36 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id EDBFA2083B for ; Wed, 29 Apr 2020 22:56:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EDBFA2083B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 297178E0005; Wed, 29 Apr 2020 18:56:35 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 23AAA8E0001; Wed, 29 Apr 2020 18:56:35 -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 12B1F8E0005; Wed, 29 Apr 2020 18:56:35 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0019.hostedemail.com [216.40.44.19]) by kanga.kvack.org (Postfix) with ESMTP id EC6BC8E0001 for ; Wed, 29 Apr 2020 18:56:34 -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 AE646181AC9C6 for ; Wed, 29 Apr 2020 22:56:34 +0000 (UTC) X-FDA: 76762403508.06.bulb65_909e49efe6c22 X-Spam-Summary: 2,0,0,8eab4f11a341c806,d41d8cd98f00b204,yang.shi@linux.alibaba.com,,RULES_HIT:41:355:379:541:800:960:973:988:989:1260:1261:1345:1431:1437:1534:1543:1711:1730:1747:1777:1792:2393:2559:2562:2898:3138:3139:3140:3141:3142:3353:3743:3865:3866:3867:5007:6261:8957:10004:11026:11473:11658:11914:12043:12048:12291:12296:12297:12438:12555:12895:13161:13229:14096:14181:14721:21060:21080:21451:21627:21990:30003:30054:30070,0,RBL:115.124.30.54:@linux.alibaba.com:.lbl8.mailshell.net-64.201.201.201 62.20.2.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fp,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:23,LUA_SUMMARY:none X-HE-Tag: bulb65_909e49efe6c22 X-Filterd-Recvd-Size: 4311 Received: from out30-54.freemail.mail.aliyun.com (out30-54.freemail.mail.aliyun.com [115.124.30.54]) by imf05.hostedemail.com (Postfix) with ESMTP for ; Wed, 29 Apr 2020 22:56:33 +0000 (UTC) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R631e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04407;MF=yang.shi@linux.alibaba.com;NM=1;PH=DS;RN=7;SR=0;TI=SMTPD_---0Tx2iHl3_1588200982; Received: from localhost(mailfrom:yang.shi@linux.alibaba.com fp:SMTPD_---0Tx2iHl3_1588200982) by smtp.aliyun-inc.com(127.0.0.1); Thu, 30 Apr 2020 06:56:30 +0800 From: Yang Shi To: kirill.shutemov@linux.intel.com, hughd@google.com, aarcange@redhat.com, akpm@linux-foundation.org Cc: yang.shi@linux.alibaba.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [linux-next PATCH 1/2] mm: khugepaged: add exceed_max_ptes_* helpers Date: Thu, 30 Apr 2020 06:56:21 +0800 Message-Id: <1588200982-69492-1-git-send-email-yang.shi@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 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: The max_ptes_{swap|none|shared} are defined to tune the behavior of khugepaged. The are checked at a couple of places with open coding. Replace the opencoding to exceed_pax_ptes_{swap|none_shared} helpers to improve the readability. Cc: Kirill A. Shutemov Cc: Hugh Dickins Cc: Andrea Arcangeli Signed-off-by: Yang Shi --- mm/khugepaged.c | 27 +++++++++++++++++++++------ 1 file changed, 21 insertions(+), 6 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index a02a4c5..0c8d30b 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -339,6 +339,21 @@ struct attribute_group khugepaged_attr_group = { }; #endif /* CONFIG_SYSFS */ +static inline bool exceed_max_ptes_none(unsigned int *nr_ptes) +{ + return (++(*nr_ptes) > khugepaged_max_ptes_none); +} + +static inline bool exceed_max_ptes_swap(unsigned int *nr_ptes) +{ + return (++(*nr_ptes) > khugepaged_max_ptes_swap); +} + +static inline bool exceed_max_ptes_shared(unsigned int *nr_ptes) +{ + return (++(*nr_ptes) > khugepaged_max_ptes_shared); +} + int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags, int advice) { @@ -604,7 +619,7 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, if (pte_none(pteval) || (pte_present(pteval) && is_zero_pfn(pte_pfn(pteval)))) { if (!userfaultfd_armed(vma) && - ++none_or_zero <= khugepaged_max_ptes_none) { + !exceed_max_ptes_none(&none_or_zero)) { continue; } else { result = SCAN_EXCEED_NONE_PTE; @@ -624,7 +639,7 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, VM_BUG_ON_PAGE(!PageAnon(page), page); if (page_mapcount(page) > 1 && - ++shared > khugepaged_max_ptes_shared) { + exceed_max_ptes_shared(&shared)) { result = SCAN_EXCEED_SHARED_PTE; goto out; } @@ -1234,7 +1249,7 @@ static int khugepaged_scan_pmd(struct mm_struct *mm, _pte++, _address += PAGE_SIZE) { pte_t pteval = *_pte; if (is_swap_pte(pteval)) { - if (++unmapped <= khugepaged_max_ptes_swap) { + if (!exceed_max_ptes_swap(&unmapped)) { /* * Always be strict with uffd-wp * enabled swap entries. Please see @@ -1252,7 +1267,7 @@ static int khugepaged_scan_pmd(struct mm_struct *mm, } if (pte_none(pteval) || is_zero_pfn(pte_pfn(pteval))) { if (!userfaultfd_armed(vma) && - ++none_or_zero <= khugepaged_max_ptes_none) { + !exceed_max_ptes_none(&none_or_zero)) { continue; } else { result = SCAN_EXCEED_NONE_PTE; @@ -1286,7 +1301,7 @@ static int khugepaged_scan_pmd(struct mm_struct *mm, } if (page_mapcount(page) > 1 && - ++shared > khugepaged_max_ptes_shared) { + exceed_max_ptes_shared(&shared)) { result = SCAN_EXCEED_SHARED_PTE; goto out_unmap; } @@ -1961,7 +1976,7 @@ static void khugepaged_scan_file(struct mm_struct *mm, continue; if (xa_is_value(page)) { - if (++swap > khugepaged_max_ptes_swap) { + if (exceed_max_ptes_swap(&swap)) { result = SCAN_EXCEED_SWAP_PTE; break; }