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Fri, 21 Feb 2025 15:20:24 +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 o4h2E7iZuGfYGQAAD6G6ig (envelope-from ); Fri, 21 Feb 2025 15:20:24 +0000 Message-ID: <14a04071-4650-4e81-b8b5-ab4dd330fe73@suse.cz> Date: Fri, 21 Feb 2025 16:20:23 +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 v10 13/18] mm: move lesser used vma_area_struct members into the last cacheline 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, david.laight.linux@gmail.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, richard.weiyang@gmail.com, corbet@lwn.net, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@android.com References: <20250213224655.1680278-1-surenb@google.com> <20250213224655.1680278-14-surenb@google.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Level: X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com,sina.com]; MIME_TRACE(0.00)[0:+]; TAGGED_RCPT(0.00)[]; TO_DN_SOME(0.00)[]; RCPT_COUNT_TWELVE(0.00)[34]; 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,gmail.com,suse.com,cmpxchg.org,intel.com,techsingularity.net,redhat.com,stgolabs.net,kernel.org,sina.com,google.com,linux.dev,soleen.com,lwn.net,vger.kernel.org,kvack.org,android.com]; R_RATELIMIT(0.00)[to_ip_from(RLumbhs4xhzuuihrchnpuyb6qu)]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.cz:email,suse.cz:mid,oracle.com:email,imap1.dmz-prg2.suse.org:helo] X-Spam-Score: -2.80 X-Spam-Flag: NO On 2/13/25 23:46, Suren Baghdasaryan wrote: > Move several vma_area_struct members which are rarely or never used > during page fault handling into the last cacheline to better pack > vm_area_struct. As a result vm_area_struct will fit into 3 as opposed > to 4 cachelines. New typical vm_area_struct layout: > > struct vm_area_struct { > union { > struct { > long unsigned int vm_start; /* 0 8 */ > long unsigned int vm_end; /* 8 8 */ > }; /* 0 16 */ > freeptr_t vm_freeptr; /* 0 8 */ > }; /* 0 16 */ > struct mm_struct * vm_mm; /* 16 8 */ > pgprot_t vm_page_prot; /* 24 8 */ > union { > const vm_flags_t vm_flags; /* 32 8 */ > vm_flags_t __vm_flags; /* 32 8 */ > }; /* 32 8 */ > unsigned int vm_lock_seq; /* 40 4 */ > > /* XXX 4 bytes hole, try to pack */ > > struct list_head anon_vma_chain; /* 48 16 */ > /* --- cacheline 1 boundary (64 bytes) --- */ > struct anon_vma * anon_vma; /* 64 8 */ > const struct vm_operations_struct * vm_ops; /* 72 8 */ > long unsigned int vm_pgoff; /* 80 8 */ > struct file * vm_file; /* 88 8 */ > void * vm_private_data; /* 96 8 */ > atomic_long_t swap_readahead_info; /* 104 8 */ > struct mempolicy * vm_policy; /* 112 8 */ > struct vma_numab_state * numab_state; /* 120 8 */ > /* --- cacheline 2 boundary (128 bytes) --- */ > refcount_t vm_refcnt (__aligned__(64)); /* 128 4 */ > > /* XXX 4 bytes hole, try to pack */ > > struct { > struct rb_node rb (__aligned__(8)); /* 136 24 */ > long unsigned int rb_subtree_last; /* 160 8 */ > } __attribute__((__aligned__(8))) shared; /* 136 32 */ > struct anon_vma_name * anon_name; /* 168 8 */ > struct vm_userfaultfd_ctx vm_userfaultfd_ctx; /* 176 8 */ > > /* size: 192, cachelines: 3, members: 18 */ > /* sum members: 176, holes: 2, sum holes: 8 */ > /* padding: 8 */ > /* forced alignments: 2, forced holes: 1, sum forced holes: 4 */ > } __attribute__((__aligned__(64))); > > Memory consumption per 1000 VMAs becomes 48 pages: > > slabinfo after vm_area_struct changes: > ... : ... > vm_area_struct ... 192 42 2 : ... > > Signed-off-by: Suren Baghdasaryan > Reviewed-by: Lorenzo Stoakes Reviewed-by: Vlastimil Babka