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=-6.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,HK_RANDOM_FROM,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 23CB6C433F5 for ; Wed, 22 Sep 2021 09:12:01 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B1C1B60F24 for ; Wed, 22 Sep 2021 09:12:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org B1C1B60F24 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 22E466B006C; Wed, 22 Sep 2021 05:12:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 1DE4D900002; Wed, 22 Sep 2021 05:12:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0A6776B0073; Wed, 22 Sep 2021 05:12:00 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0166.hostedemail.com [216.40.44.166]) by kanga.kvack.org (Postfix) with ESMTP id F27E36B006C for ; Wed, 22 Sep 2021 05:11:59 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id B1E6122863 for ; Wed, 22 Sep 2021 09:11:59 +0000 (UTC) X-FDA: 78614642358.05.8731A31 Received: from mail-pg1-f180.google.com (mail-pg1-f180.google.com [209.85.215.180]) by imf11.hostedemail.com (Postfix) with ESMTP id 65ABEF0000B4 for ; Wed, 22 Sep 2021 09:11:59 +0000 (UTC) Received: by mail-pg1-f180.google.com with SMTP id k24so1991090pgh.8 for ; Wed, 22 Sep 2021 02:11:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=/H8JM7coTsTy8XjFA3lC9gYA0UOGgAXPd+2isahauao=; b=HLfzScsMUNlMK27qLlQSMLyfFJnzi9FRK1BoI4XnD5EpQ+Emg5A4BoboFCRpkw9Wu6 GFb3+8rXr2IGnlWuakYdqs9ifweiLD482y5Wh/4vszZ6EN6rVvdHADhIS0epD+NYEwE5 VB3SD6O3yCZSWZdAQCSzUgeh9GEYZHrRP38yqiZ/LsmaVLYrV1ZitsdcCx3+crTPbW9/ 9mXffiGZFQNCc55bpPPcSbV2jXSe4V84W3wfzbuiENLTLgOwILeOqvzupRWDDtAqWlqQ in3ruqZ1NB/EXth8tYXBxPyqcm5ojD+7vypxzfXWxb2UNl54PRTzzCGscW5qzbRsDJ3Z eHvg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=/H8JM7coTsTy8XjFA3lC9gYA0UOGgAXPd+2isahauao=; b=omsX9EVLcdUYw9akLuf20pcnpe6QqPpAzeuLOKjamUdTHSvmwmcrPBg30FudKzq9GE vuwQUhxVQC3h+eFCj30avgQoII0PWAkYjyxhD7PDk7lVzhuThozqc5fUOphQssFT3YaM Bcqr1r66CnY6lrAjyspZpw7bzkRwaZtw/1QOsPz1T7RdHJLAvvmxRiOWWcExFZxVxzQL sJB0mIDhg3tBd6lt4OGmWHBDd+Ol3giMdcRJFc3FYqEj4QWodDcDCQ2JNNfYssdjgr6m qfBDQUK/aNMEJsd4wtA65ZKhvNhIoh+QLs/egKD2i4tJUKl14UHxDGvwDN62nUU8D/1C 27dg== X-Gm-Message-State: AOAM5313gC1l4fz7lzSvJOe7G9Gsab6UD5U+HvL2E98rZSm7IHOwoz83 OA/0+SmC8Blkhu5VFT6wpZA= X-Google-Smtp-Source: ABdhPJyJbGKl9PSSC+E0xge37GY2XBRLrgMN4EpM3vgbuVyw3BCwFcQ0wzvDDavBtUv/zMLPJv3aow== X-Received: by 2002:a65:6554:: with SMTP id a20mr32010143pgw.107.1632301918483; Wed, 22 Sep 2021 02:11:58 -0700 (PDT) Received: from kvm.asia-northeast3-a.c.our-ratio-313919.internal (252.229.64.34.bc.googleusercontent.com. [34.64.229.252]) by smtp.gmail.com with ESMTPSA id h15sm1755742pfo.54.2021.09.22.02.11.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Sep 2021 02:11:58 -0700 (PDT) Date: Wed, 22 Sep 2021 09:11:53 +0000 From: Hyeonggon Yoo <42.hyeyoo@gmail.com> To: Matthew Wilcox Cc: linux-mm@kvack.org, Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , Vlastimil Babka , linux-kernel@vger.kernel.org, Jens Axboe , John Garry , linux-block@vger.kernel.org, netdev@vger.kernel.org Subject: Re: [RFC v2 PATCH] mm, sl[au]b: Introduce lockless cache Message-ID: <20210922091153.GA80396@kvm.asia-northeast3-a.c.our-ratio-313919.internal> References: <20210920154816.31832-1-42.hyeyoo@gmail.com> <20210921154239.GA5092@kvm.asia-northeast3-a.c.our-ratio-313919.internal> <20210922083228.GA79355@kvm.asia-northeast3-a.c.our-ratio-313919.internal> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210922083228.GA79355@kvm.asia-northeast3-a.c.our-ratio-313919.internal> X-Stat-Signature: ngern4aoo84nzd64y9g1gpbpc8um1pht Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=HLfzScsM; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf11.hostedemail.com: domain of 42.hyeyoo@gmail.com designates 209.85.215.180 as permitted sender) smtp.mailfrom=42.hyeyoo@gmail.com X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 65ABEF0000B4 X-HE-Tag: 1632301919-87195 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: > @@ -491,13 +492,13 @@ void kmem_cache_free_cached(struct kmem_cache *s, void *p) > cache = get_cpu_ptr(s->cache); > if (cache->size < KMEM_LOCKLESS_CACHE_QUEUE_SIZE) { > cache->queue[cache->size++] = p; > - put_cpu_ptr(s->cache); > - return ; > + } else { > + kmem_cache_free_bulk(s, > + KMEM_LOCKLESS_CACHE_BATCHCOUNT, > + cache->queue - KMEM_LOCKLESS_CACHE_BATCHCOUNT); > + cache->size -= KMEM_LOCKLESS_CACHE_BATCHCOUNT; > } > put_cpu_ptr(s->cache); > - > - /* Is there better way to do this? */ > - kmem_cache_free(s, p); > } > EXPORT_SYMBOL(kmem_cache_free_cached); Sent you a wrong code. Above was buggy code from some hours ago because of cache->queue - KMEM_LOCKLESS_CACHE_BATCHCOUNT. So that is now: cache = get_cpu_ptr(s->cache); if (cache->size < KMEM_LOCKLESS_CACHE_QUEUE_SIZE) { cache->queue[cache->size++] = p; } else { kmem_cache_free_bulk(s, KMEM_LOCKLESS_CACHE_BATCHCOUNT, cache->queue + KMEM_LOCKLESS_CACHE_QUEUE_SIZE - KMEM_LOCKLESS_CACHE_BATCHCOUNT); cache->size -= KMEM_LOCKLESS_CACHE_BATCHCOUNT; } put_cpu_ptr(s->cache);