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Wed, 09 Jun 2021 11:39:34 +0000 From: Vlastimil Babka To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christoph Lameter , David Rientjes , Pekka Enberg , Joonsoo Kim Cc: Sebastian Andrzej Siewior , Thomas Gleixner , Mel Gorman , Jesper Dangaard Brouer , Peter Zijlstra , Jann Horn , Vlastimil Babka Subject: [RFC v2 14/34] mm, slub: move disabling irqs closer to get_partial() in ___slab_alloc() Date: Wed, 9 Jun 2021 13:38:43 +0200 Message-Id: <20210609113903.1421-15-vbabka@suse.cz> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210609113903.1421-1-vbabka@suse.cz> References: <20210609113903.1421-1-vbabka@suse.cz> MIME-Version: 1.0 Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=ZCNw0ycc; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=uUS8PbDZ; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=ZCNw0ycc; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=uUS8PbDZ; dmarc=none; spf=pass (imf23.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Stat-Signature: 19m9ps6gr74ckrui9sdwfawu33ybwhn8 X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: D53E0A000247 X-HE-Tag: 1623238771-815853 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: Continue reducing the irq disabled scope. Check for per-cpu partial slabs= with first with irqs enabled and then recheck with irqs disabled before grabbi= ng the slab page. Mostly preparatory for the following patches. Signed-off-by: Vlastimil Babka --- mm/slub.c | 34 +++++++++++++++++++++++++--------- 1 file changed, 25 insertions(+), 9 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 22b5bfef8aa6..acb5e8f1d9da 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2633,11 +2633,6 @@ static void *___slab_alloc(struct kmem_cache *s, g= fp_t gfpflags, int node, if (unlikely(node !=3D NUMA_NO_NODE && !node_isset(node, slab_nodes))) node =3D NUMA_NO_NODE; - local_irq_save(flags); - if (unlikely(c->page)) { - local_irq_restore(flags); - goto reread_page; - } goto new_slab; } redo: @@ -2678,6 +2673,7 @@ static void *___slab_alloc(struct kmem_cache *s, gf= p_t gfpflags, int node, =20 if (!freelist) { c->page =3D NULL; + local_irq_restore(flags); stat(s, DEACTIVATE_BYPASS); goto new_slab; } @@ -2707,12 +2703,19 @@ static void *___slab_alloc(struct kmem_cache *s, = gfp_t gfpflags, int node, goto reread_page; } deactivate_slab(s, page, c->freelist, c); + local_irq_restore(flags); =20 new_slab: =20 - lockdep_assert_irqs_disabled(); - if (slub_percpu_partial(c)) { + local_irq_save(flags); + if (unlikely(c->page)) { + local_irq_restore(flags); + goto reread_page; + } + if (unlikely(!slub_percpu_partial(c))) + goto new_objects; /* stolen by an IRQ handler */ + page =3D c->page =3D slub_percpu_partial(c); slub_set_percpu_partial(c, page); local_irq_restore(flags); @@ -2720,6 +2723,16 @@ static void *___slab_alloc(struct kmem_cache *s, g= fp_t gfpflags, int node, goto redo; } =20 + local_irq_save(flags); + if (unlikely(c->page)) { + local_irq_restore(flags); + goto reread_page; + } + +new_objects: + + lockdep_assert_irqs_disabled(); + freelist =3D get_partial(s, gfpflags, node, &page); if (freelist) { c->page =3D page; @@ -2752,15 +2765,18 @@ static void *___slab_alloc(struct kmem_cache *s, = gfp_t gfpflags, int node, check_new_page: =20 if (kmem_cache_debug(s)) { - if (!alloc_debug_processing(s, page, freelist, addr)) + if (!alloc_debug_processing(s, page, freelist, addr)) { /* Slab failed checks. Next slab needed */ + c->page =3D NULL; + local_irq_restore(flags); goto new_slab; - else + } else { /* * For debug case, we don't load freelist so that all * allocations go through alloc_debug_processing() */ goto return_single; + } } =20 if (unlikely(!pfmemalloc_match(page, gfpflags))) --=20 2.31.1