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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.22.2023.04.14.07.26.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Apr 2023 07:26:30 -0700 (PDT) From: Chih-En Lin To: Andrew Morton , Qi Zheng , David Hildenbrand , "Matthew Wilcox (Oracle)" , Christophe Leroy , John Hubbard , Nadav Amit , Barry Song , Pasha Tatashin Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Steven Rostedt , Masami Hiramatsu , Peter Zijlstra , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Ian Rogers , Adrian Hunter , Yu Zhao , Steven Barrett , Juergen Gross , Peter Xu , Kefeng Wang , Tong Tiangen , Christoph Hellwig , "Liam R. Howlett" , Yang Shi , Vlastimil Babka , Alex Sierra , Vincent Whitchurch , Anshuman Khandual , Li kunyu , Liu Shixin , Hugh Dickins , Minchan Kim , Joey Gouly , Chih-En Lin , Michal Hocko , Suren Baghdasaryan , "Zach O'Keefe" , Gautam Menghani , Catalin Marinas , Mark Brown , "Eric W. Biederman" , Andrei Vagin , Shakeel Butt , Daniel Bristot de Oliveira , "Jason A. Donenfeld" , Greg Kroah-Hartman , Alexey Gladkov , 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 , Pedro Fonseca , Jim Huang , Huichun Feng Subject: [PATCH v5 14/17] fs/proc: Support COW PTE with clear_refs_write Date: Fri, 14 Apr 2023 22:23:38 +0800 Message-Id: <20230414142341.354556-15-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-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 9B4964000C X-Rspam-User: X-Stat-Signature: 13y3up9jmo1y56s94dc611m56qwet7xz X-HE-Tag: 1681482391-367902 X-HE-Meta: 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 SRi946Tl 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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: Before clearing the entry in COW-ed PTE, break COW PTE first. Signed-off-by: Chih-En Lin --- fs/proc/task_mmu.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 6a96e1713fd5..c76b74029dfd 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1195,6 +1195,11 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, if (pmd_trans_unstable(pmd)) return 0; + /* Only break COW when we modify the soft-dirty bit. */ + if (cp->type == CLEAR_REFS_SOFT_DIRTY && + break_cow_pte(vma, pmd, addr)) + return 0; + pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); for (; addr != end; pte++, addr += PAGE_SIZE) { ptent = *pte; -- 2.34.1