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Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.0 Subject: Re: [PATCH 07/12] mm, slab: ignore SLAB_RECLAIM_ACCOUNT with CONFIG_SLUB_TINY Content-Language: en-US To: Roman Gushchin Cc: Christoph Lameter , David Rientjes , Joonsoo Kim , Pekka Enberg , Hyeonggon Yoo <42.hyeyoo@gmail.com>, Andrew Morton , Linus Torvalds , Matthew Wilcox , patches@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20221121171202.22080-1-vbabka@suse.cz> <20221121171202.22080-8-vbabka@suse.cz> 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=1669280945; a=rsa-sha256; cv=none; b=rcwQnwCDlpJSMUV7MecTWi3t+t8ZNol8Q2XV7xRocdS8+neB061vjONPP0oUOBNjV1/UkB 5UKbLbnyIDlm3ovMCj52WvOGPbXwVuAJ7V76xzZTEPlaIEi5W7ZKFXqY131bJOlU/2gtQG cpmDk0dNRlGmTgvs3XIBbP4HpDsXLYo= ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=kEOX+wB6; 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spf=pass (imf08.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.28 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none X-Rspamd-Server: rspam07 X-Stat-Signature: ujakqoix3fhnoc3s3zog5qu3kja4wuyp X-HE-Tag: 1669280945-959126 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 11/24/22 02:20, Roman Gushchin wrote: > On Mon, Nov 21, 2022 at 06:11:57PM +0100, Vlastimil Babka wrote: >> SLAB_RECLAIM_ACCOUNT caches allocate their slab pages with >> __GFP_RECLAIMABLE and can help against fragmentation by grouping pages >> by mobility, but on tiny systems mobility grouping is likely disabled >> anyway and ignoring SLAB_RECLAIM_ACCOUNT might instead lead to merging >> of caches that are made incompatible just by the flag. >> >> Thus with CONFIG_SLUB_TINY, make SLAB_RECLAIM_ACCOUNT ineffective. > > Hm, do you see disabling all kernel memory accounting functionality > with COFNIG_SLUB_TINY? I'd say yes. But in this case need to be consistent > and disable it alltogether. SLAB_RECLAIM_ACCOUNT is kinda misnomer these days, as the only thing it does is to add __GFP_RECLAIMABLE to cache's gfp flags for the page allocator's mobility grouping. I guess the "ACCOUNT" part comes from being counted towards SReclaimable (vs SUnreclaim) in /proc/meminfo. So currently SLUB_TINY has no effect on MEMCG_KMEM (which you probably meant). Using those two together has little sense and had I stumbled while making this series upon a code that would become complicated, I would have made SLUB_TINY disable MEMCG_KMEM, but that didn't happen so I left as is for now. > Thanks!