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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 YDA6OmWrAmF9AwAAMHmgww (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 10/35] mm, slub: restructure new page checks in ___slab_alloc() Date: Thu, 29 Jul 2021 15:21:07 +0200 Message-Id: <20210729132132.19691-11-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: rspam06 X-Rspamd-Queue-Id: 3E056300009B Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b="RY/O1Ybf"; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=TSD9acl5; dmarc=none; spf=pass (imf03.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.28 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Stat-Signature: nrykkisyganofmibouyb6pomhjytth7n X-HE-Tag: 1627564903-306134 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: When we allocate slab object from a newly acquired page (from node's part= ial list or page allocator), we usually also retain the page as a new percpu = slab. There are two exceptions - when pfmemalloc status of the page doesn't mat= ch our gfp flags, or when the cache has debugging enabled. The current code for these decisions is not easy to follow, so restructur= e it and add comments. The new structure will also help with the following cha= nges. No functional change. Signed-off-by: Vlastimil Babka Acked-by: Mel Gorman --- mm/slub.c | 28 ++++++++++++++++++++++------ 1 file changed, 22 insertions(+), 6 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 92a866adce3d..469aa8155663 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2765,13 +2765,29 @@ static void *___slab_alloc(struct kmem_cache *s, = gfp_t gfpflags, int node, c->page =3D page; =20 check_new_page: - if (likely(!kmem_cache_debug(s) && pfmemalloc_match(page, gfpflags))) - goto load_freelist; =20 - /* Only entered in the debug case */ - if (kmem_cache_debug(s) && - !alloc_debug_processing(s, page, freelist, addr)) - goto new_slab; /* Slab failed checks. Next slab needed */ + if (kmem_cache_debug(s)) { + if (!alloc_debug_processing(s, page, freelist, addr)) + /* Slab failed checks. Next slab needed */ + goto new_slab; + else + /* + * For debug case, we don't load freelist so that all + * allocations go through alloc_debug_processing() + */ + goto return_single; + } + + if (unlikely(!pfmemalloc_match(page, gfpflags))) + /* + * For !pfmemalloc_match() case we don't load freelist so that + * we don't make further mismatched allocations easier. + */ + goto return_single; + + goto load_freelist; + +return_single: =20 deactivate_slab(s, page, get_freepointer(s, freelist), c); return freelist; --=20 2.32.0