From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 39F26C48BCD for ; Wed, 9 Jun 2021 11:40:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 22BDE61364 for ; Wed, 9 Jun 2021 11:40:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239279AbhFILmB (ORCPT ); Wed, 9 Jun 2021 07:42:01 -0400 Received: from smtp-out2.suse.de ([195.135.220.29]:46966 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239145AbhFILl3 (ORCPT ); Wed, 9 Jun 2021 07:41:29 -0400 Received: from imap.suse.de (imap-alt.suse-dmz.suse.de [192.168.254.47]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 4E7121FD62; Wed, 9 Jun 2021 11:39:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1623238773; 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=VxG0sTKG3HDQvTVC+wgypTAYjlpWe1E+zR9CMgBlKVE=; b=VgaBv0jv8ekGLTGkPcWtSbBkK43e1mKqGkYzPFDwmnaQICdiJz28h5LXVJ/Z8epVWA2xxk 3kCpd0oPsN6tLFiWd841pTIPXwPtECiyX9oSrEJHb88boahSQCiiMRQbC+RERHzAyOCw0F vdlM7+8myOV7dhM+cf+dskR830UQQ6U= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1623238773; 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=VxG0sTKG3HDQvTVC+wgypTAYjlpWe1E+zR9CMgBlKVE=; b=siZMeoMpA+713vHHCpAmN4iXON34m+uYDBrbCgJ2wjCc+KWDxs0r8wr3P/59DWT3a9JDCe 87KmRma2rVo19WBA== Received: from imap3-int (imap-alt.suse-dmz.suse.de [192.168.254.47]) by imap.suse.de (Postfix) with ESMTP id 2010D11A98; Wed, 9 Jun 2021 11:39:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1623238773; 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=VxG0sTKG3HDQvTVC+wgypTAYjlpWe1E+zR9CMgBlKVE=; b=VgaBv0jv8ekGLTGkPcWtSbBkK43e1mKqGkYzPFDwmnaQICdiJz28h5LXVJ/Z8epVWA2xxk 3kCpd0oPsN6tLFiWd841pTIPXwPtECiyX9oSrEJHb88boahSQCiiMRQbC+RERHzAyOCw0F vdlM7+8myOV7dhM+cf+dskR830UQQ6U= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1623238773; 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=VxG0sTKG3HDQvTVC+wgypTAYjlpWe1E+zR9CMgBlKVE=; b=siZMeoMpA+713vHHCpAmN4iXON34m+uYDBrbCgJ2wjCc+KWDxs0r8wr3P/59DWT3a9JDCe 87KmRma2rVo19WBA== Received: from director2.suse.de ([192.168.254.72]) by imap3-int with ESMTPSA id QOlbB3WowGD6XgAALh3uQQ (envelope-from ); Wed, 09 Jun 2021 11:39:33 +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 09/34] mm, slub: return slab page from get_partial() and set c->page afterwards Date: Wed, 9 Jun 2021 13:38:38 +0200 Message-Id: <20210609113903.1421-10-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 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The function get_partial() finds a suitable page on a partial list, acquires and returns its freelist and assigns the page pointer to kmem_cache_cpu. In later patch we will need more control over the kmem_cache_cpu.page assignment, so instead of passing a kmem_cache_cpu pointer, pass a pointer to a pointer to a page that get_partial() can fill and the caller can assign the kmem_cache_cpu.page pointer. No functional change as all of this still happens with disabled IRQs. Signed-off-by: Vlastimil Babka --- mm/slub.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 87f652bf8e4d..ca7cfc7706cc 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1957,7 +1957,7 @@ static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags); * Try to allocate a partial slab from a specific node. */ static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n, - struct kmem_cache_cpu *c, gfp_t flags) + struct page **ret_page, gfp_t flags) { struct page *page, *page2; void *object = NULL; @@ -1986,7 +1986,7 @@ static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n, available += objects; if (!object) { - c->page = page; + *ret_page = page; stat(s, ALLOC_FROM_PARTIAL); object = t; } else { @@ -2006,7 +2006,7 @@ static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n, * Get a page from somewhere. Search in increasing NUMA distances. */ static void *get_any_partial(struct kmem_cache *s, gfp_t flags, - struct kmem_cache_cpu *c) + struct page **ret_page) { #ifdef CONFIG_NUMA struct zonelist *zonelist; @@ -2048,7 +2048,7 @@ static void *get_any_partial(struct kmem_cache *s, gfp_t flags, if (n && cpuset_zone_allowed(zone, flags) && n->nr_partial > s->min_partial) { - object = get_partial_node(s, n, c, flags); + object = get_partial_node(s, n, ret_page, flags); if (object) { /* * Don't check read_mems_allowed_retry() @@ -2070,7 +2070,7 @@ static void *get_any_partial(struct kmem_cache *s, gfp_t flags, * Get a partial page, lock it and return it. */ static void *get_partial(struct kmem_cache *s, gfp_t flags, int node, - struct kmem_cache_cpu *c) + struct page **ret_page) { void *object; int searchnode = node; @@ -2078,11 +2078,11 @@ static void *get_partial(struct kmem_cache *s, gfp_t flags, int node, if (node == NUMA_NO_NODE) searchnode = numa_mem_id(); - object = get_partial_node(s, get_node(s, searchnode), c, flags); + object = get_partial_node(s, get_node(s, searchnode), ret_page, flags); if (object || node != NUMA_NO_NODE) return object; - return get_any_partial(s, flags, c); + return get_any_partial(s, flags, ret_page); } #ifdef CONFIG_PREEMPTION @@ -2694,9 +2694,11 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, goto redo; } - freelist = get_partial(s, gfpflags, node, c); - if (freelist) + freelist = get_partial(s, gfpflags, node, &page); + if (freelist) { + c->page = page; goto check_new_page; + } page = new_slab(s, gfpflags, node); @@ -2720,7 +2722,6 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, c->page = page; check_new_page: - page = c->page; if (likely(!kmem_cache_debug(s) && pfmemalloc_match(page, gfpflags))) goto load_freelist; -- 2.31.1