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Tue, 7 Jan 2025 17:35:46 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id lONqBPJlfWeOcgAAD6G6ig (envelope-from ); Tue, 07 Jan 2025 17:35:46 +0000 Message-ID: <0d36fd53-b817-4bbd-ae38-af094bd301df@suse.cz> Date: Tue, 7 Jan 2025 18:35:45 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 10/17] mm: uninline the main body of vma_start_write() Content-Language: en-US To: Suren Baghdasaryan , akpm@linux-foundation.org Cc: peterz@infradead.org, willy@infradead.org, liam.howlett@oracle.com, lorenzo.stoakes@oracle.com, mhocko@suse.com, hannes@cmpxchg.org, mjguzik@gmail.com, oliver.sang@intel.com, mgorman@techsingularity.net, david@redhat.com, peterx@redhat.com, oleg@redhat.com, dave@stgolabs.net, paulmck@kernel.org, brauner@kernel.org, dhowells@redhat.com, hdanton@sina.com, hughd@google.com, lokeshgidra@google.com, minchan@google.com, jannh@google.com, shakeel.butt@linux.dev, souravpanda@google.com, pasha.tatashin@soleen.com, klarasmodin@gmail.com, corbet@lwn.net, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@android.com References: <20241226170710.1159679-1-surenb@google.com> <20241226170710.1159679-11-surenb@google.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 2CDF3180023 X-Stat-Signature: 1xz767xek36znzzpyiahtndqymogm45y X-Rspam-User: X-HE-Tag: 1736271348-518642 X-HE-Meta: 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 xv5tMnXI hAfFvfno6w8VKbt1a7KfTDh8i5AS22zcLs+MTWNm2S3fAY7QDTm2JcvqpXsV7tJhHtDu5s2kXYGPmbF+ORdQo4hpTsfuC7yr4nmu7KfujPwl32W9OQNskCYgZ1FQVsVFP4RPOYGH1T8GPcn6Pd/o1dcvFKLZLnSr0zlL7VCzHptxixJZdcws4kMp3b0SY6fmJ/cfPJDym4Z5uV+zy1uaYhKPuUDHi3/k5l77e9eAzWkq7nV0kj4HnYC8U1xH74Dan+UP3OisXAeiIwdDgMXTgs5FJWXFjtUmPnPohkdCpTqFVOvCK4lT6XcGhLFY0IVRfpElc/6Xy7t+kQYlOFX1VyGfQhdwucCFNLe52Xr9rHt3K9lc= 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: List-Subscribe: List-Unsubscribe: On 12/26/24 18:07, Suren Baghdasaryan wrote: > vma_start_write() is used in many places and will grow in size very soon. > It is not used in performance critical paths and uninlining it should > limit the future code size growth. > No functional changes. > > Signed-off-by: Suren Baghdasaryan Reviewed-by: Vlastimil Babka > --- a/mm/memory.c > +++ b/mm/memory.c > @@ -6328,6 +6328,20 @@ struct vm_area_struct *lock_mm_and_find_vma(struct mm_struct *mm, > #endif > > #ifdef CONFIG_PER_VMA_LOCK > +void __vma_start_write(struct vm_area_struct *vma, unsigned int mm_lock_seq) > +{ > + down_write(&vma->vm_lock.lock); > + /* > + * We should use WRITE_ONCE() here because we can have concurrent reads > + * from the early lockless pessimistic check in vma_start_read(). > + * We don't really care about the correctness of that early check, but > + * we should use WRITE_ONCE() for cleanliness and to keep KCSAN happy. > + */ > + WRITE_ONCE(vma->vm_lock_seq, mm_lock_seq); > + up_write(&vma->vm_lock.lock); > +} > +EXPORT_SYMBOL_GPL(__vma_start_write); Do any modules need it? If not we shouldn't export. > /* > * Lookup and lock a VMA under RCU protection. Returned VMA is guaranteed to be > * stable and not isolated. If the VMA is not found or is being modified the