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Tue, 12 Nov 2024 15:57:47 +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 0VuaN/t6M2d2FwAAD6G6ig (envelope-from ); Tue, 12 Nov 2024 15:57:47 +0000 Message-ID: <07a72c38-22f5-4b99-9d74-0877eaf2bee2@suse.cz> Date: Tue, 12 Nov 2024 16:57:47 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/4] mm: move per-vma lock into vm_area_struct Content-Language: en-US To: Suren Baghdasaryan , akpm@linux-foundation.org Cc: 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, minchan@google.com, jannh@google.com, shakeel.butt@linux.dev, souravpanda@google.com, pasha.tatashin@soleen.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@android.com References: <20241111205506.3404479-1-surenb@google.com> <20241111205506.3404479-3-surenb@google.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Score: -4.30 X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com,sina.com]; RCPT_COUNT_TWELVE(0.00)[27]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_TLS_ALL(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FROM_HAS_DN(0.00)[]; FREEMAIL_CC(0.00)[infradead.org,oracle.com,suse.com,cmpxchg.org,gmail.com,intel.com,techsingularity.net,redhat.com,stgolabs.net,kernel.org,sina.com,google.com,linux.dev,soleen.com,kvack.org,vger.kernel.org,android.com]; R_RATELIMIT(0.00)[to_ip_from(RLumbhs4xhzuuihrchnpuyb6qu)]; FROM_EQ_ENVFROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FUZZY_BLOCKED(0.00)[rspamd.com]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.cz:mid,imap1.dmz-prg2.suse.org:helo] X-Spam-Flag: NO X-Spam-Level: On 11/11/24 21:55, Suren Baghdasaryan wrote: > @@ -511,7 +476,6 @@ void __vm_area_free(struct vm_area_struct *vma) > { > vma_numab_state_free(vma); > free_anon_vma_name(vma); > - vma_lock_free(vma); > kmem_cache_free(vm_area_cachep, vma); > } Have you investigated if this allows to perform vma_numab_state_free() and free_anon_vma_name() immediately, and only kfree_rcu() the vma itself, instead of performing all this in a call_rcu() callback? Of course if we succeed converting vma's to SLAB_TYPESAFE_RCU this immediate freeing of numab state and anon_vma_name would be implied, but maybe it's an useful intermediate step on its own.