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Thu, 5 Aug 2021 15:20:09 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id KEgID6kBDGFDdQAAMHmgww (envelope-from ); Thu, 05 Aug 2021 15:20:09 +0000 From: Vlastimil Babka To: Andrew Morton , Christoph Lameter , David Rientjes , Pekka Enberg , Joonsoo Kim Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Mike Galbraith , Sebastian Andrzej Siewior , Thomas Gleixner , Mel Gorman , Jesper Dangaard Brouer , Jann Horn , Vlastimil Babka Subject: [PATCH v4 28/35] mm, slab: make flush_slab() possible to call with irqs enabled Date: Thu, 5 Aug 2021 17:19:53 +0200 Message-Id: <20210805152000.12817-29-vbabka@suse.cz> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210805152000.12817-1-vbabka@suse.cz> References: <20210805152000.12817-1-vbabka@suse.cz> MIME-Version: 1.0 Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=CE8KYpFl; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=omZRhwN1; dmarc=none; spf=pass (imf15.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.28 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Stat-Signature: gcb5g9n7ik3dwb7puunjidhxammzp8a6 X-Rspamd-Queue-Id: 6B894D001136 X-Rspamd-Server: rspam01 X-HE-Tag: 1628176810-271488 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: Currently flush_slab() is always called with disabled IRQs if it's needed= , but the following patches will change that, so add a parameter to control IRQ disabling within the function, which only protects the kmem_cache_cpu manipulation and not the call to deactivate_slab() which doesn't need it. Signed-off-by: Vlastimil Babka --- mm/slub.c | 24 ++++++++++++++++++------ 1 file changed, 18 insertions(+), 6 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index c10f2c9b9352..dceb289cb052 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2477,16 +2477,28 @@ static void put_cpu_partial(struct kmem_cache *s,= struct page *page, int drain) #endif /* CONFIG_SLUB_CPU_PARTIAL */ } =20 -static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cp= u *c) +static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cp= u *c, + bool lock) { - void *freelist =3D c->freelist; - struct page *page =3D c->page; + unsigned long flags; + void *freelist; + struct page *page; + + if (lock) + local_irq_save(flags); + + freelist =3D c->freelist; + page =3D c->page; =20 c->page =3D NULL; c->freelist =3D NULL; c->tid =3D next_tid(c->tid); =20 - deactivate_slab(s, page, freelist); + if (lock) + local_irq_restore(flags); + + if (page) + deactivate_slab(s, page, freelist); =20 stat(s, CPUSLAB_FLUSH); } @@ -2496,7 +2508,7 @@ static inline void __flush_cpu_slab(struct kmem_cac= he *s, int cpu) struct kmem_cache_cpu *c =3D per_cpu_ptr(s->cpu_slab, cpu); =20 if (c->page) - flush_slab(s, c); + flush_slab(s, c, false); =20 unfreeze_partials_cpu(s, c); } @@ -2512,7 +2524,7 @@ static void flush_cpu_slab(void *d) struct kmem_cache_cpu *c =3D this_cpu_ptr(s->cpu_slab); =20 if (c->page) - flush_slab(s, c); + flush_slab(s, c, false); =20 unfreeze_partials(s); } --=20 2.32.0