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Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.11.0 Subject: Re: [PATCH v3 08/15] mm/slab_common: kmalloc_node: pass large requests to page allocator Content-Language: en-US To: Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , Roman Gushchin , Joe Perches , Vasily Averin , Matthew WilCox , linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20220712133946.307181-1-42.hyeyoo@gmail.com> <20220712133946.307181-9-42.hyeyoo@gmail.com> From: Vlastimil Babka In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1659432763; a=rsa-sha256; cv=none; b=vbExGOsKRWy67LmGzw5O31B6fjOyZr0oh8jcqiYhgorG5hqUc8l4s5KIQiZOIbPfleFOFs 5rWi3m2zKKlSDbZgnF4L05pCGRJvEURme35mzsri7+Ac/5Wd+jP4e4Fi2xHY2+4VFbKqW6 IT9xJiS0MBz0ZGkAeoKXToJQljksZvc= ARC-Authentication-Results: i=1; imf07.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=tUhiJwoc; 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dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=k5aX033T; spf=pass (imf07.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none X-Rspamd-Server: rspam03 X-HE-Tag: 1659432763-537100 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 8/2/22 10:59, Hyeonggon Yoo wrote: > On Mon, Aug 01, 2022 at 04:44:22PM +0200, Vlastimil Babka wrote: >> > > Yeah, uninlining __kmalloc_large_node saves hundreds of bytes. > And the diff below looks good to me. > > By The Way, do you have opinions on inlining slab_alloc_node()? > (Looks like similar topic?) > > AFAIK slab_alloc_node() is inlined in: > kmem_cache_alloc() > kmem_cache_alloc_node() > kmem_cache_alloc_lru() > kmem_cache_alloc_trace() > kmem_cache_alloc_node_trace() > __kmem_cache_alloc_node() > > This is what I get after simply dropping __always_inline in slab_alloc_node: > > add/remove: 1/1 grow/shrink: 3/6 up/down: 1911/-5275 (-3364) > Function old new delta > slab_alloc_node - 1356 +1356 > sysfs_slab_alias 134 327 +193 > slab_memory_callback 528 717 +189 > __kmem_cache_create 1325 1498 +173 > __slab_alloc.constprop 135 - -135 > kmem_cache_alloc_trace 909 196 -713 > kmem_cache_alloc 937 191 -746 > kmem_cache_alloc_node_trace 1020 200 -820 > __kmem_cache_alloc_node 862 19 -843 > kmem_cache_alloc_node 1046 189 -857 > kmem_cache_alloc_lru 1348 187 -1161 > Total: Before=32011183, After=32007819, chg -0.01% > > So 3.28kB is cost of eliminating function call overhead in the > fastpath. > > This is tradeoff between function call overhead and > instruction cache usage... We can investigate this aftewards, with proper measurements etc. I think it's more sensitive than kmalloc_large_node.