Message ID | 20230414142341.354556-9-shiyn.lin@gmail.com (mailing list archive) |
---|---|
State | New |
Headers | show
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(2001-b011-20e0-1499-8303-7502-d3d7-e13b.dynamic-ip6.hinet.net. [2001:b011:20e0:1499:8303:7502:d3d7:e13b]) by smtp.googlemail.com with ESMTPSA id h7-20020a17090ac38700b0022335f1dae2sm2952386pjt.22.2023.04.14.07.25.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Apr 2023 07:25:34 -0700 (PDT) From: Chih-En Lin <shiyn.lin@gmail.com> To: Andrew Morton <akpm@linux-foundation.org>, Qi Zheng <zhengqi.arch@bytedance.com>, David Hildenbrand <david@redhat.com>, "Matthew Wilcox (Oracle)" <willy@infradead.org>, Christophe Leroy <christophe.leroy@csgroup.eu>, John Hubbard <jhubbard@nvidia.com>, Nadav Amit <namit@vmware.com>, Barry Song <baohua@kernel.org>, Pasha Tatashin <pasha.tatashin@soleen.com> Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Dave Hansen <dave.hansen@linux.intel.com>, "H. Peter Anvin" <hpa@zytor.com>, Steven Rostedt <rostedt@goodmis.org>, Masami Hiramatsu <mhiramat@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Arnaldo Carvalho de Melo <acme@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Alexander Shishkin <alexander.shishkin@linux.intel.com>, Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>, Ian Rogers <irogers@google.com>, Adrian Hunter <adrian.hunter@intel.com>, Yu Zhao <yuzhao@google.com>, Steven Barrett <steven@liquorix.net>, Juergen Gross <jgross@suse.com>, Peter Xu <peterx@redhat.com>, Kefeng Wang <wangkefeng.wang@huawei.com>, Tong Tiangen <tongtiangen@huawei.com>, Christoph Hellwig <hch@infradead.org>, "Liam R. Howlett" <Liam.Howlett@Oracle.com>, Yang Shi <shy828301@gmail.com>, Vlastimil Babka <vbabka@suse.cz>, Alex Sierra <alex.sierra@amd.com>, Vincent Whitchurch <vincent.whitchurch@axis.com>, Anshuman Khandual <anshuman.khandual@arm.com>, Li kunyu <kunyu@nfschina.com>, Liu Shixin <liushixin2@huawei.com>, Hugh Dickins <hughd@google.com>, Minchan Kim <minchan@kernel.org>, Joey Gouly <joey.gouly@arm.com>, Chih-En Lin <shiyn.lin@gmail.com>, Michal Hocko <mhocko@suse.com>, Suren Baghdasaryan <surenb@google.com>, "Zach O'Keefe" <zokeefe@google.com>, Gautam Menghani <gautammenghani201@gmail.com>, Catalin Marinas <catalin.marinas@arm.com>, Mark Brown <broonie@kernel.org>, "Eric W. Biederman" <ebiederm@xmission.com>, Andrei Vagin <avagin@gmail.com>, Shakeel Butt <shakeelb@google.com>, Daniel Bristot de Oliveira <bristot@kernel.org>, "Jason A. Donenfeld" <Jason@zx2c4.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Alexey Gladkov <legion@kernel.org>, x86@kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Dinglan Peng <peng301@purdue.edu>, Pedro Fonseca <pfonseca@purdue.edu>, Jim Huang <jserv@ccns.ncku.edu.tw>, Huichun Feng <foxhoundsk.tw@gmail.com> Subject: [PATCH v5 08/17] mm/ksm: Break COW PTE before modify shared PTE Date: Fri, 14 Apr 2023 22:23:32 +0800 Message-Id: <20230414142341.354556-9-shiyn.lin@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230414142341.354556-1-shiyn.lin@gmail.com> References: <20230414142341.354556-1-shiyn.lin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam03 X-Stat-Signature: yrc4xg4p7cnekpx5chqq7c7emfhgbnbe X-Rspamd-Queue-Id: 32B84C0017 X-HE-Tag: 1681482335-720767 X-HE-Meta: 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 /yBo7vYW 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 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 |
Introduce Copy-On-Write to Page Table
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expand
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diff --git a/mm/ksm.c b/mm/ksm.c index 2b8d30068cbb..963ef4d0085d 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -1052,7 +1052,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page, pte_t *orig_pte) { struct mm_struct *mm = vma->vm_mm; - DEFINE_PAGE_VMA_WALK(pvmw, page, vma, 0, 0); + DEFINE_PAGE_VMA_WALK(pvmw, page, vma, 0, PVMW_BREAK_COW_PTE); int swapped; int err = -EFAULT; struct mmu_notifier_range range; @@ -1169,6 +1169,8 @@ static int replace_page(struct vm_area_struct *vma, struct page *page, barrier(); if (!pmd_present(pmde) || pmd_trans_huge(pmde)) goto out; + if (break_cow_pte(vma, pmd, addr)) + goto out; mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm, addr, addr + PAGE_SIZE);
Break COW PTE before merge the page that reside in COW-ed PTE. Signed-off-by: Chih-En Lin <shiyn.lin@gmail.com> --- mm/ksm.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)