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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pjiVU-00FTWr-SP; Tue, 04 Apr 2023 15:23:37 +0000 Date: Tue, 4 Apr 2023 16:23:36 +0100 From: Matthew Wilcox To: Suren Baghdasaryan Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Punit Agrawal Subject: Re: [PATCH 6/6] mm: Run the fault-around code under the VMA lock Message-ID: References: <20230404135850.3673404-1-willy@infradead.org> <20230404135850.3673404-7-willy@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230404135850.3673404-7-willy@infradead.org> X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 4FAC1A000C X-Stat-Signature: nuk5n6fctq8dagkpdkin3xsd16b867wh X-HE-Tag: 1680621820-839265 X-HE-Meta: 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 C+zalaYu cJWXFCqCNgIP9TzWyWpJdlYMJJfDOMhAsfVKukcdNmDpmCjl7d4QkRgSKPNMHaJEiOjh4kltvBaax+GWB7Q3DCZllf0KEaehLgtRQHlRI1gGgw2nZ1OYEiZaOmjRyl5JGZxGNSQ+Uq4y/E0ux+8VKZkF++VPwluwAkGmWBo7lTmv94DI= 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: On Tue, Apr 04, 2023 at 02:58:50PM +0100, Matthew Wilcox (Oracle) wrote: > The map_pages fs method should be safe to run under the VMA lock instead > of the mmap lock. This should have a measurable reduction in contention > on the mmap lock. https://github.com/antonblanchard/will-it-scale/pull/37/files should be a good microbenchmark to report numbers from. Obviously real-world benchmarks will be more compelling.