From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 306912CA4 for ; Tue, 4 Jan 2022 00:10:59 +0000 (UTC) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 700811F390; Tue, 4 Jan 2022 00:10:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1641255055; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8cX+MqFzs23iA6f2WW/NvfY66bLNhZidgQT19nDQPA4=; b=047EmuH9UoTQ9bDliMls1xbcDcoezBU6k+2VRJxJqdYb7x24zXqUsoyhUA2oqePgTP1KJb 67qiwS1iT6u2KDBjKmJCdiXMgaWCB/4ttdJslaxBDHA9Nwrd/IuHSzqdw+reBuFZxjfxlU 6b8MCSOiHLez4NO24QOZhgMvDhIFFgc= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1641255055; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8cX+MqFzs23iA6f2WW/NvfY66bLNhZidgQT19nDQPA4=; b=FsLnaZ0ydaPnxYnGMLIYQItwnzNOE5Dty+OtbKxT/u9JiXikLM5759uL0mvxdrRvCWc492 UQ6+TLGEBl6CxNCQ== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 47752139D1; Tue, 4 Jan 2022 00:10:55 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id COCsEI+Q02FEQwAAMHmgww (envelope-from ); Tue, 04 Jan 2022 00:10:55 +0000 From: Vlastimil Babka To: Matthew Wilcox , Christoph Lameter , David Rientjes , Joonsoo Kim , Pekka Enberg Cc: linux-mm@kvack.org, Andrew Morton , Johannes Weiner , Roman Gushchin , Hyeonggon Yoo <42.hyeyoo@gmail.com>, patches@lists.linux.dev, Vlastimil Babka Subject: [PATCH v4 14/32] mm/slub: Convert alloc_slab_page() to return a struct slab Date: Tue, 4 Jan 2022 01:10:28 +0100 Message-Id: <20220104001046.12263-15-vbabka@suse.cz> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220104001046.12263-1-vbabka@suse.cz> References: <20220104001046.12263-1-vbabka@suse.cz> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2996; h=from:subject; bh=har/molbV+DD0v0Sg+BhljUqPbdMVpB3+k1Ub0YAYVo=; b=owEBbQGS/pANAwAIAeAhynPxiakQAcsmYgBh05B1yrj/ishk905thkDvYrdHdTeY9Yq3MWIQQTmE qXzrroGJATMEAAEIAB0WIQSNS5MBqTXjGL5IXszgIcpz8YmpEAUCYdOQdQAKCRDgIcpz8YmpEGndCA Cnx7TRle43sVKSbJtgS3EJC+LobtCmRhkR16+eCuAqprswuXsk1Wus1NyHPzgtPhfp0KYfsbi5Q51v c43Ydo0Pr/xgjlBUe4archFYrqgM0A4SplMsdRoXVZPAhz5ETuXkbYpHkhZQPit7IsQyDbTK3iJ0pj fqfP1p+Tp4XsxAwck3l9XVJ/RNTQoLLdh6y/oAMsJnI+ueufJKp6WYxeN5aqvE7vX3+m9E12iMClcH B5jZvBmgS9Ubf8p92aDRcQ01/d/BFlDF76aIw/inSrCO3Ii3peBMZWEQSwvGok2l43SdJM5+YBLqk5 mhfBy5cTBYdBMyUkxWpdL5iJ3tppP3 X-Developer-Key: i=vbabka@suse.cz; a=openpgp; fpr=A940D434992C2E8E99103D50224FA7E7CC82A664 Content-Transfer-Encoding: 8bit Preparatory, callers convert back to struct page for now. Also move setting page flags to alloc_slab_page() where we still operate on a struct page. This means the page->slab_cache pointer is now set later than the PageSlab flag, which could theoretically confuse some pfn walker assuming PageSlab means there would be a valid cache pointer. But as the code had no barriers and used __set_bit() anyway, it could have happened already, so there shouldn't be such a walker. Signed-off-by: Vlastimil Babka Reviewed-by: Roman Gushchin Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> --- mm/slub.c | 26 ++++++++++++++++---------- 1 file changed, 16 insertions(+), 10 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index d3e9e322b4e2..65cbdeae7edb 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1788,18 +1788,27 @@ static void *setup_object(struct kmem_cache *s, struct page *page, /* * Slab allocation and freeing */ -static inline struct page *alloc_slab_page(struct kmem_cache *s, +static inline struct slab *alloc_slab_page(struct kmem_cache *s, gfp_t flags, int node, struct kmem_cache_order_objects oo) { - struct page *page; + struct folio *folio; + struct slab *slab; unsigned int order = oo_order(oo); if (node == NUMA_NO_NODE) - page = alloc_pages(flags, order); + folio = (struct folio *)alloc_pages(flags, order); else - page = __alloc_pages_node(node, flags, order); + folio = (struct folio *)__alloc_pages_node(node, flags, order); - return page; + if (!folio) + return NULL; + + slab = folio_slab(folio); + __folio_set_slab(folio); + if (page_is_pfmemalloc(folio_page(folio, 0))) + slab_set_pfmemalloc(slab); + + return slab; } #ifdef CONFIG_SLAB_FREELIST_RANDOM @@ -1932,7 +1941,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) if ((alloc_gfp & __GFP_DIRECT_RECLAIM) && oo_order(oo) > oo_order(s->min)) alloc_gfp = (alloc_gfp | __GFP_NOMEMALLOC) & ~(__GFP_RECLAIM|__GFP_NOFAIL); - page = alloc_slab_page(s, alloc_gfp, node, oo); + page = slab_page(alloc_slab_page(s, alloc_gfp, node, oo)); if (unlikely(!page)) { oo = s->min; alloc_gfp = flags; @@ -1940,7 +1949,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) * Allocation may have failed due to fragmentation. * Try a lower order alloc if possible */ - page = alloc_slab_page(s, alloc_gfp, node, oo); + page = slab_page(alloc_slab_page(s, alloc_gfp, node, oo)); if (unlikely(!page)) goto out; stat(s, ORDER_FALLBACK); @@ -1951,9 +1960,6 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) account_slab(page_slab(page), oo_order(oo), s, flags); page->slab_cache = s; - __SetPageSlab(page); - if (page_is_pfmemalloc(page)) - SetPageSlabPfmemalloc(page); kasan_poison_slab(page); -- 2.34.1