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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 CBDEAC47086 for ; Mon, 24 May 2021 23:40:58 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 75DD16141F for ; Mon, 24 May 2021 23:40:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 75DD16141F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 239946B0078; Mon, 24 May 2021 19:40:52 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 1D4086B0080; Mon, 24 May 2021 19:40:52 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E3E8E6B0078; Mon, 24 May 2021 19:40:51 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0081.hostedemail.com [216.40.44.81]) by kanga.kvack.org (Postfix) with ESMTP id ABF436B0072 for ; Mon, 24 May 2021 19:40:51 -0400 (EDT) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 4E15F181AEF2A for ; Mon, 24 May 2021 23:40:51 +0000 (UTC) X-FDA: 78177747102.01.9F3479D Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf16.hostedemail.com (Postfix) with ESMTP id CC06A80192D8 for ; Mon, 24 May 2021 23:40:45 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1621899648; 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=1xmWeJ1b7AZlmflgkuweNV6NpHrLePBdboBsTBPbV/k=; b=JoaTF4rqBbwWtdHjrYUyCM/QqY0hcx8rqKdEwXsbGgayd9D7nrxrKjRRG96f1rr0pxkojB Q4Wq26PiCK1wcYmstYjpoDfT5IXgmDdqeCpHih3/V1+qCbGY6PockH5rxi7413yGns9vVO ZiBbgyoQxkBY5FQs/AGCcri2u4csPV4= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1621899648; 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=1xmWeJ1b7AZlmflgkuweNV6NpHrLePBdboBsTBPbV/k=; b=E7m4pF7yX975qQIzoPzuGk7jsqfXsunkwKDsF+v818VG1L4hZR5aSd1yRJVN9IMmKuc/cL KfzO/8ZKmHl/pJDQ== Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 1BAFFAF21; Mon, 24 May 2021 23:40:48 +0000 (UTC) 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 08/26] mm, slub: restructure new page checks in ___slab_alloc() Date: Tue, 25 May 2021 01:39:28 +0200 Message-Id: <20210524233946.20352-9-vbabka@suse.cz> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210524233946.20352-1-vbabka@suse.cz> References: <20210524233946.20352-1-vbabka@suse.cz> MIME-Version: 1.0 Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=JoaTF4rq; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=E7m4pF7y; dmarc=none; spf=pass (imf16.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.15 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: CC06A80192D8 X-Stat-Signature: ocjued889czzy5c9yc1teo9ip8a11mr1 X-HE-Tag: 1621899645-733752 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. No functional change. Signed-off-by: Vlastimil Babka --- mm/slub.c | 28 ++++++++++++++++++++++------ 1 file changed, 22 insertions(+), 6 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index f240e424c861..06f30c9ad361 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2743,13 +2743,29 @@ 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 2.31.1