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Wed, 09 Jun 2021 11:39:32 +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 08/34] mm, slub: dissolve new_slab_objects() into ___slab_alloc() Date: Wed, 9 Jun 2021 13:38:37 +0200 Message-Id: <20210609113903.1421-9-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 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: B277E4202A19 X-Stat-Signature: 5aq7xxq61kzy68nekbosaenhxp5ciwpm Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=V8FHGEI4; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=gRRa2lgy; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=V8FHGEI4; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=gRRa2lgy; dmarc=none; spf=pass (imf10.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-HE-Tag: 1623238770-182832 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: The later patches will need more fine grained control over individual act= ions in ___slab_alloc(), the only caller of new_slab_objects(), so dissolve it there. This is a preparatory step with no functional change. The only minor change is moving WARN_ON_ONCE() for using a constructor to= gether with __GFP_ZERO to new_slab(), which makes it somewhat less frequent, but= still able to catch a development change introducing a systematic misuse. Signed-off-by: Vlastimil Babka Acked-by: Christoph Lameter Acked-by: Mel Gorman --- mm/slub.c | 50 ++++++++++++++++++-------------------------------- 1 file changed, 18 insertions(+), 32 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 38256e87dde8..87f652bf8e4d 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1825,6 +1825,8 @@ static struct page *new_slab(struct kmem_cache *s, = gfp_t flags, int node) if (unlikely(flags & GFP_SLAB_BUG_MASK)) flags =3D kmalloc_fix_flags(flags); =20 + WARN_ON_ONCE(s->ctor && (flags & __GFP_ZERO)); + return allocate_slab(s, flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node); } @@ -2550,36 +2552,6 @@ slab_out_of_memory(struct kmem_cache *s, gfp_t gfp= flags, int nid) #endif } =20 -static inline void *new_slab_objects(struct kmem_cache *s, gfp_t flags, - int node, struct kmem_cache_cpu **pc) -{ - void *freelist =3D NULL; - struct kmem_cache_cpu *c =3D *pc; - struct page *page; - - WARN_ON_ONCE(s->ctor && (flags & __GFP_ZERO)); - - page =3D new_slab(s, flags, node); - if (page) { - c =3D raw_cpu_ptr(s->cpu_slab); - if (c->page) - flush_slab(s, c); - - /* - * No other reference to the page yet so we can - * muck around with it freely without cmpxchg - */ - freelist =3D page->freelist; - page->freelist =3D NULL; - - stat(s, ALLOC_SLAB); - c->page =3D page; - *pc =3D c; - } - - return freelist; -} - static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags) { if (unlikely(PageSlabPfmemalloc(page))) @@ -2726,13 +2698,27 @@ static void *___slab_alloc(struct kmem_cache *s, = gfp_t gfpflags, int node, if (freelist) goto check_new_page; =20 - freelist =3D new_slab_objects(s, gfpflags, node, &c); + page =3D new_slab(s, gfpflags, node); =20 - if (unlikely(!freelist)) { + if (unlikely(!page)) { slab_out_of_memory(s, gfpflags, node); return NULL; } =20 + c =3D raw_cpu_ptr(s->cpu_slab); + if (c->page) + flush_slab(s, c); + + /* + * No other reference to the page yet so we can + * muck around with it freely without cmpxchg + */ + freelist =3D page->freelist; + page->freelist =3D NULL; + + stat(s, ALLOC_SLAB); + c->page =3D page; + check_new_page: page =3D c->page; if (likely(!kmem_cache_debug(s) && pfmemalloc_match(page, gfpflags))) --=20 2.31.1