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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pjhBU-00FPcf-4A; Tue, 04 Apr 2023 13:58:52 +0000 From: "Matthew Wilcox (Oracle)" To: Suren Baghdasaryan Cc: "Matthew Wilcox (Oracle)" , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Punit Agrawal Subject: [PATCH 1/6] mm: Allow per-VMA locks on file-backed VMAs Date: Tue, 4 Apr 2023 14:58:45 +0100 Message-Id: <20230404135850.3673404-2-willy@infradead.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230404135850.3673404-1-willy@infradead.org> References: <20230404135850.3673404-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: C4B2E1C0017 X-Rspam-User: X-Stat-Signature: oq7wu1fdwf6j19e5f8tw49hh9fe9azq6 X-HE-Tag: 1680616743-968674 X-HE-Meta: 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 1Wf4MKJH FRqOgppErRZG4zSXH7FHfbjNJDPEE0rxZ7vv6sJJGXejttg3lLOaSUDaP+L5SyFL1aE1nqcADAyBH359IwxyicpXcwtYzVcHulQJ1ZAIWA3ivzN4SR0qG/WXMsL7IhRXJFNs9Z8Ut/vxQyhTSXS/SA4lrv0MGnyJptP+qurGd3QCLCAd7bBRunfWyamUKh9rz5ck3 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 fault path will immediately fail in handle_mm_fault(), so this is the minimal step which allows the per-VMA lock to be taken on file-backed VMAs. There may be a small performance reduction as a little unnecessary work will be done on each page fault. See later patches for the improvement. Signed-off-by: Matthew Wilcox (Oracle) --- mm/memory.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index fdaec7772fff..f726f85f0081 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -5223,6 +5223,9 @@ vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address, flags & FAULT_FLAG_REMOTE)) return VM_FAULT_SIGSEGV; + if ((flags & FAULT_FLAG_VMA_LOCK) && !vma_is_anonymous(vma)) + return VM_FAULT_RETRY; + /* * Enable the memcg OOM handling for faults triggered in user * space. Kernel faults are handled more gracefully. @@ -5275,12 +5278,8 @@ struct vm_area_struct *lock_vma_under_rcu(struct mm_struct *mm, if (!vma) goto inval; - /* Only anonymous vmas are supported for now */ - if (!vma_is_anonymous(vma)) - goto inval; - /* find_mergeable_anon_vma uses adjacent vmas which are not locked */ - if (!vma->anon_vma) + if (vma_is_anonymous(vma) && !vma->anon_vma) goto inval; if (!vma_start_read(vma)) -- 2.39.2