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Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: [PATCH v2 13/23] mm/slab: kmalloc: pass requests larger than order-1 page to page allocator Content-Language: en-US To: Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: Marco Elver , Matthew WilCox , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , Roman Gushchin , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20220414085727.643099-1-42.hyeyoo@gmail.com> <20220414085727.643099-14-42.hyeyoo@gmail.com> From: Vlastimil Babka In-Reply-To: <20220414085727.643099-14-42.hyeyoo@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: CDF0A4003E X-Stat-Signature: ds8tbyo5uoej4ddpoianczw3y67uwiuh Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=y5ZDC4wM; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=+wXKTGVj; dmarc=none; spf=pass (imf11.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Rspam-User: X-HE-Tag: 1651046999-389522 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 4/14/22 10:57, Hyeonggon Yoo wrote: > There is not much benefit for serving large objects in kmalloc(). > Let's pass large requests to page allocator like SLUB for better > maintenance of common code. > > Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Reviewed-by: Vlastimil Babka Some nits: > @@ -3607,15 +3607,25 @@ void kmem_cache_free_bulk(struct kmem_cache *orig_s, size_t size, void **p) > { > struct kmem_cache *s; > size_t i; > + struct folio *folio; > > local_irq_disable(); > for (i = 0; i < size; i++) { > void *objp = p[i]; folio can be declared here could probably move 's' too, and 'i' to the for () thanks to gnu11 > > - if (!orig_s) /* called via kfree_bulk */ > - s = virt_to_cache(objp); > - else > + if (!orig_s) { > + folio = virt_to_folio(objp); > + /* called via kfree_bulk */ > + if (!folio_test_slab(folio)) { > + local_irq_enable(); > + free_large_kmalloc(folio, objp); > + local_irq_disable(); > + continue; > + } > + s = folio_slab(folio)->slab_cache; > + } else > s = cache_from_obj(orig_s, objp); This should now use { } brackets per kernel style. > + > if (!s) > continue; >