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Mon, 06 Feb 2023 19:55:00 -0800 (PST) From: Chih-En Lin To: Andrew Morton , Qi Zheng , David Hildenbrand , "Matthew Wilcox (Oracle)" , Christophe Leroy , John Hubbard , Nadav Amit , Barry Song Cc: Steven Rostedt , Masami Hiramatsu , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Yang Shi , Peter Xu , Vlastimil Babka , "Zach O'Keefe" , Yun Zhou , Hugh Dickins , Suren Baghdasaryan , Pasha Tatashin , Yu Zhao , Juergen Gross , Tong Tiangen , Liu Shixin , Anshuman Khandual , Li kunyu , Minchan Kim , Miaohe Lin , Gautam Menghani , Catalin Marinas , Mark Brown , Will Deacon , Vincenzo Frascino , Thomas Gleixner , "Eric W. Biederman" , Andy Lutomirski , Sebastian Andrzej Siewior , "Liam R. Howlett" , Fenghua Yu , Andrei Vagin , Barret Rhoden , Michal Hocko , "Jason A. Donenfeld" , Alexey Gladkov , 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 , Chih-En Lin Subject: [PATCH v4 12/14] fs/proc: Support COW PTE with clear_refs_write Date: Tue, 7 Feb 2023 11:51:37 +0800 Message-Id: <20230207035139.272707-13-shiyn.lin@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230207035139.272707-1-shiyn.lin@gmail.com> References: <20230207035139.272707-1-shiyn.lin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 0DC0C40008 X-Stat-Signature: 618g3g65om5cka9w7xnzq4m6mur43p7p X-HE-Tag: 1675742101-696189 X-HE-Meta: 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 +wlQEGWN 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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 af1c49ae11b1..94958422aede 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1196,6 +1196,11 @@ 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