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Thu, 29 Jul 2021 13:21:41 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id oBBiAWWrAmF9AwAAMHmgww (envelope-from ); Thu, 29 Jul 2021 13:21:41 +0000 From: Vlastimil Babka To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christoph Lameter , David Rientjes , Pekka Enberg , Joonsoo Kim Cc: Mike Galbraith , Sebastian Andrzej Siewior , Thomas Gleixner , Mel Gorman , Jesper Dangaard Brouer , Jann Horn , Vlastimil Babka Subject: [PATCH v3 05/35] mm, slub: remove redundant unfreeze_partials() from put_cpu_partial() Date: Thu, 29 Jul 2021 15:21:02 +0200 Message-Id: <20210729132132.19691-6-vbabka@suse.cz> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210729132132.19691-1-vbabka@suse.cz> References: <20210729132132.19691-1-vbabka@suse.cz> MIME-Version: 1.0 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 3511490000A0 Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=pMNhU5Sa; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=VlJlFJup; spf=pass (imf23.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none X-Stat-Signature: wkd7gnnenya9qr46cuxh51ff8juztih3 X-HE-Tag: 1627564902-947088 Content-Transfer-Encoding: quoted-printable 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: Commit d6e0b7fa1186 ("slub: make dead caches discard free slabs immediate= ly") introduced cpu partial flushing for kmemcg caches, based on setting the t= arget cpu_partial to 0 and adding a flushing check in put_cpu_partial(). This code that sets cpu_partial to 0 was later moved by c9fc586403e7 ("sl= ab: introduce __kmemcg_cache_deactivate()") and ultimately removed by 9855609= bde03 ("mm: memcg/slab: use a single set of kmem_caches for all accounted allocations"). However the check and flush in put_cpu_partial() was never removed, although it's effectively a dead code. So this patch removes it. Note that d6e0b7fa1186 also added preempt_disable()/enable() to unfreeze_partials() which could be thus also considered unnecessary. But further patches will rely on it, so keep it. Signed-off-by: Vlastimil Babka --- mm/slub.c | 7 ------- 1 file changed, 7 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 0f08b64e2fd1..15f01d2ca30f 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2463,13 +2463,6 @@ static void put_cpu_partial(struct kmem_cache *s, = struct page *page, int drain) =20 } while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) !=3D oldpage); - if (unlikely(!slub_cpu_partial(s))) { - unsigned long flags; - - local_irq_save(flags); - unfreeze_partials(s, this_cpu_ptr(s->cpu_slab)); - local_irq_restore(flags); - } preempt_enable(); #endif /* CONFIG_SLUB_CPU_PARTIAL */ } --=20 2.32.0