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a=rsa-sha256; c=relaxed/relaxed; d=stgolabs.net; s=dreamhost; t=1673397569; bh=o8yEaYcRgiVvt7yHXPFiT7zox2nJmD44kCtYTtXc45I=; h=Date:From:To:Cc:Subject:Content-Type; b=fvVGLpB5u6C0euGhg1uhftkOix9hq0800aRoqQn0FfD/XsAZRRcVVzKCZWFiLwMHr 6SbMStqI9JBKXDnHvoaz6Qhsb/IQMECSeQ8inaheo9GA79l/Vwrd1WNseCK3iR6jkC Es7W+EzwDI2P0Iv4Cu+OGEoglXmHjTXs1vsqJEQjar1BvbYE7I/JvIWxIITtOLrWLV Q0xiL0kCY6ryfoFp4EQfi9PzLg/W100y2AnqxALsmKU2iLebbG0yoHRz4kl1G3lEH6 dencuMZZOtI43MOKNY88F/IXWrwfyI0jiisiCl9W3lpq9akVvdSdOlnWd1p3puoSW/ Ux0VSz7seypsA== Date: Tue, 10 Jan 2023 16:13:31 -0800 From: Davidlohr Bueso To: Suren Baghdasaryan Cc: akpm@linux-foundation.org, michel@lespinasse.org, jglisse@google.com, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mgorman@techsingularity.net, willy@infradead.org, liam.howlett@oracle.com, peterz@infradead.org, ldufour@linux.ibm.com, laurent.dufour@fr.ibm.com, paulmck@kernel.org, luto@kernel.org, songliubraving@fb.com, peterx@redhat.com, david@redhat.com, dhowells@redhat.com, hughd@google.com, bigeasy@linutronix.de, kent.overstreet@linux.dev, punit.agrawal@bytedance.com, lstoakes@gmail.com, peterjung1337@gmail.com, rientjes@google.com, axelrasmussen@google.com, joelaf@google.com, minchan@google.com, jannh@google.com, shakeelb@google.com, tatashin@google.com, edumazet@google.com, gthelen@google.com, gurua@google.com, arjunroy@google.com, soheil@google.com, hughlynch@google.com, leewalsh@google.com, posk@google.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org, kernel-team@android.com Subject: Re: [PATCH 08/41] mm: introduce CONFIG_PER_VMA_LOCK Message-ID: <20230111001331.cxdeh52vvta6ok2p@offworld> Mail-Followup-To: Suren Baghdasaryan , akpm@linux-foundation.org, michel@lespinasse.org, jglisse@google.com, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mgorman@techsingularity.net, willy@infradead.org, liam.howlett@oracle.com, peterz@infradead.org, ldufour@linux.ibm.com, laurent.dufour@fr.ibm.com, paulmck@kernel.org, luto@kernel.org, songliubraving@fb.com, peterx@redhat.com, david@redhat.com, dhowells@redhat.com, hughd@google.com, bigeasy@linutronix.de, kent.overstreet@linux.dev, punit.agrawal@bytedance.com, lstoakes@gmail.com, peterjung1337@gmail.com, rientjes@google.com, axelrasmussen@google.com, joelaf@google.com, minchan@google.com, jannh@google.com, shakeelb@google.com, tatashin@google.com, edumazet@google.com, gthelen@google.com, gurua@google.com, arjunroy@google.com, soheil@google.com, hughlynch@google.com, leewalsh@google.com, posk@google.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org, kernel-team@android.com References: <20230109205336.3665937-1-surenb@google.com> <20230109205336.3665937-9-surenb@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20230109205336.3665937-9-surenb@google.com> User-Agent: NeoMutt/20220429 X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 02F13180002 X-Stat-Signature: uh8ijnyh34b6xx5nezz4zm4ih91fqkfm X-HE-Tag: 1673397571-991193 X-HE-Meta: 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 rP68ZZte MXp9jNYH/e9Qg0xE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000002, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, 09 Jan 2023, Suren Baghdasaryan wrote: >This configuration variable will be used to build the support for VMA >locking during page fault handling. > >This is enabled by default on supported architectures with SMP and MMU >set. > >The architecture support is needed since the page fault handler is called >from the architecture's page faulting code which needs modifications to >handle faults under VMA lock. I don't think that per-vma locking should be something that is user-configurable. It should just be depdendant on the arch. So maybe just remove CONFIG_PER_VMA_LOCK? Thanks, Davidlohr