From patchwork Wed Sep 8 02:54:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 12479831 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=-15.8 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 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 134CEC433F5 for ; Wed, 8 Sep 2021 02:54:07 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id BA6DA61101 for ; Wed, 8 Sep 2021 02:54:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org BA6DA61101 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 61472940008; Tue, 7 Sep 2021 22:54:06 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5C2FE940007; Tue, 7 Sep 2021 22:54:06 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 48B07940008; Tue, 7 Sep 2021 22:54:06 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0181.hostedemail.com [216.40.44.181]) by kanga.kvack.org (Postfix) with ESMTP id 35106940007 for ; Tue, 7 Sep 2021 22:54:06 -0400 (EDT) Received: from smtpin02.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 002C12FDE7 for ; Wed, 8 Sep 2021 02:54:05 +0000 (UTC) X-FDA: 78562886892.02.C8361E7 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf20.hostedemail.com (Postfix) with ESMTP id 6AEF5D0000AA for ; Wed, 8 Sep 2021 02:54:05 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 3CEEE610C9; Wed, 8 Sep 2021 02:54:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1631069644; bh=jy2MicaFyMtTDBkxGCLRFzuXpebXz2ifIBR53vqmud4=; h=Date:From:To:Subject:In-Reply-To:From; b=kekiyoHOoFbIHjl+omazNpvblu9zCGfrqYwq6GDp5/CtuPiNOHtU7Lh6MAMoYW694 DqBRCJVvjtEClcctQdEHfHsA7cQ/jQ5Ug7Ep5c5A4srMgoRvVQ/6QUHargO2v2msp7 FEPMksnJsUu/8BrBTjfaH1HVmt7AzK7TGl/hkq4Q= Date: Tue, 07 Sep 2021 19:54:03 -0700 From: Andrew Morton To: akpm@linux-foundation.org, bigeasy@linutronix.de, brouer@redhat.com, cl@linux.com, efault@gmx.de, iamjoonsoo.kim@lge.com, jannh@google.com, linux-mm@kvack.org, mgorman@techsingularity.net, mm-commits@vger.kernel.org, penberg@kernel.org, quic_qiancai@quicinc.com, rientjes@google.com, tglx@linutronix.de, torvalds@linux-foundation.org, vbabka@suse.cz Subject: [patch 021/147] mm, slub: move irq control into unfreeze_partials() Message-ID: <20210908025403.i8EImBZsw%akpm@linux-foundation.org> In-Reply-To: <20210907195226.14b1d22a07c085b22968b933@linux-foundation.org> User-Agent: s-nail v14.8.16 Authentication-Results: imf20.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=kekiyoHO; spf=pass (imf20.hostedemail.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 6AEF5D0000AA X-Stat-Signature: np5o4mizy7mt7mpxcwewehsptmf5n9er X-HE-Tag: 1631069645-616664 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: From: Vlastimil Babka Subject: mm, slub: move irq control into unfreeze_partials() unfreeze_partials() can be optimized so that it doesn't need irqs disabled for the whole time. As the first step, move irq control into the function and remove it from the put_cpu_partial() caller. Link: https://lkml.kernel.org/r/20210904105003.11688-22-vbabka@suse.cz Signed-off-by: Vlastimil Babka Cc: Christoph Lameter Cc: David Rientjes Cc: Jann Horn Cc: Jesper Dangaard Brouer Cc: Joonsoo Kim Cc: Mel Gorman Cc: Mike Galbraith Cc: Pekka Enberg Cc: Qian Cai Cc: Sebastian Andrzej Siewior Cc: Thomas Gleixner Signed-off-by: Andrew Morton --- mm/slub.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) --- a/mm/slub.c~mm-slub-move-irq-control-into-unfreeze_partials +++ a/mm/slub.c @@ -2350,9 +2350,8 @@ redo: /* * Unfreeze all the cpu partial slabs. * - * This function must be called with interrupts disabled - * for the cpu using c (or some other guarantee must be there - * to guarantee no concurrent accesses). + * This function must be called with preemption or migration + * disabled with c local to the cpu. */ static void unfreeze_partials(struct kmem_cache *s, struct kmem_cache_cpu *c) @@ -2360,6 +2359,9 @@ static void unfreeze_partials(struct kme #ifdef CONFIG_SLUB_CPU_PARTIAL struct kmem_cache_node *n = NULL, *n2 = NULL; struct page *page, *discard_page = NULL; + unsigned long flags; + + local_irq_save(flags); while ((page = slub_percpu_partial(c))) { struct page new; @@ -2412,6 +2414,8 @@ static void unfreeze_partials(struct kme discard_slab(s, page); stat(s, FREE_SLAB); } + + local_irq_restore(flags); #endif /* CONFIG_SLUB_CPU_PARTIAL */ } @@ -2439,14 +2443,11 @@ static void put_cpu_partial(struct kmem_ pobjects = oldpage->pobjects; pages = oldpage->pages; if (drain && pobjects > slub_cpu_partial(s)) { - unsigned long flags; /* * partial array is full. Move the existing * set to the per node partial list. */ - local_irq_save(flags); unfreeze_partials(s, this_cpu_ptr(s->cpu_slab)); - local_irq_restore(flags); oldpage = NULL; pobjects = 0; pages = 0;