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=-9.8 required=3.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 C801FC4CEC7 for ; Sun, 15 Sep 2019 16:53:24 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 72DF1214D9 for ; Sun, 15 Sep 2019 16:53:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="jVgOxzsa" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 72DF1214D9 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 23F506B0003; Sun, 15 Sep 2019 12:53:24 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 1EFB56B000A; Sun, 15 Sep 2019 12:53:24 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1057A6B000C; Sun, 15 Sep 2019 12:53:24 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0106.hostedemail.com [216.40.44.106]) by kanga.kvack.org (Postfix) with ESMTP id DEB126B0003 for ; Sun, 15 Sep 2019 12:53:23 -0400 (EDT) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with SMTP id 798102C06 for ; Sun, 15 Sep 2019 16:53:23 +0000 (UTC) X-FDA: 75937750686.19.pet28_3aa764645b314 X-HE-Tag: pet28_3aa764645b314 X-Filterd-Recvd-Size: 6318 Received: from mail-pg1-f193.google.com (mail-pg1-f193.google.com [209.85.215.193]) by imf38.hostedemail.com (Postfix) with ESMTP for ; Sun, 15 Sep 2019 16:53:22 +0000 (UTC) Received: by mail-pg1-f193.google.com with SMTP id u72so18013830pgb.10 for ; Sun, 15 Sep 2019 09:53:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=3ghBrDy6wMKk43GDL/rFQB3qO4WlHynWL3G2LPomcOY=; b=jVgOxzsaBL7d6+d3FL3j79i1Fvbge77Zkqt6VNcmsJHg+TdLOdCa9HZ7rqMVW+EkvX M7/xxz9g3zkcLp59hc8nHrNfKiXw2o7u5iWTX1afNpqNDKJYUgE1MHiyaiZ/xV7XCwgy SRPhmSR5oe9NAe4ppvY6n/YpvWcv+j01Zop8QJilVoYpSccyHjw0sVGVFTv6HYF7rpwv LdB7gTH75HT9MzWEd9Vsj+/jtLt62KVzWvqoOGXm6tUnyQKfXuV6gmeFBt0Y6C3lV+vV psoqcjB9SSXA4H7rY2x5sTdSp/UqS61F/PdfPB/t3wNoqrb6gNs0hmuW1m3Mohn/ZtKH Nzyg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=3ghBrDy6wMKk43GDL/rFQB3qO4WlHynWL3G2LPomcOY=; b=Hjzn64hvD6XsXxmfxfThP6vwCuzyWVCDd8w/rgBZqmk0gCICajEvM+p/KKcku/iC4h 54/oyzO8lqqxklLIZqrf1nOWgMORiMR72DBATdrZFC9An7p+gaK+6y3pKSoKub1UPegM AthgdzmRPzJ6uUArF9I3MOJSUc0zi7lFq08KRQ2AuQdYsVRdY+MdJdDOyc4Vv3OG97Md hUURyK1Q7fTfiDOv0O+XWI/FLRNwXbVqH+JgZlqUrgWPVW+zuY9d2nyo9PDlwW2aHcgn h3KO2mMqkhrbi/pyaV2g18rKQIGFldql5lO+owAbQ3bFVSiQWMl0yNGIeqeP7C8H7Tvj Pb9w== X-Gm-Message-State: APjAAAWy2Ch7by8FAsvPtlrsOcvxZ82Vztv+9RMLCiDVLSwTsxa+kGTn ojr7+f0Ai58o4t829yq2SZM= X-Google-Smtp-Source: APXvYqyT0EudM329i6xxR9PsWR8BAYr560iqmnyO6W8R7cfNb0ye4ziGG50q8+ogMrkk+tXgw9rOWw== X-Received: by 2002:aa7:8a8a:: with SMTP id a10mr52476468pfc.131.1568566402236; Sun, 15 Sep 2019 09:53:22 -0700 (PDT) Received: from localhost.localdomain.localdomain ([2408:823c:c11:160:b8c3:8577:bf2f:3]) by smtp.gmail.com with ESMTPSA id a4sm4383259pgq.6.2019.09.15.09.53.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 15 Sep 2019 09:53:21 -0700 (PDT) From: Pengfei Li To: akpm@linux-foundation.org Cc: vbabka@suse.cz, cl@linux.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, guro@fb.com, Pengfei Li Subject: [PATCH v4 6/7] mm, slab_common: initialize the same size of kmalloc_caches[] Date: Mon, 16 Sep 2019 00:51:18 +0800 Message-Id: <20190915165121.7237-10-lpf.vector@gmail.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190915165121.7237-1-lpf.vector@gmail.com> References: <20190915165121.7237-1-lpf.vector@gmail.com> MIME-Version: 1.0 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: In the current implementation, KMALLOC_RECLAIM is not initialized until all the KMALLOC_NORMAL sizes have been initialized. But for a particular size, create_kmalloc_caches() can be executed faster by initializing different types of kmalloc in order. $ ./scripts/bloat-o-meter vmlinux.old vmlinux.patch_1-5 add/remove: 1/2 grow/shrink: 6/64 up/down: 872/-1113 (-241) Function old new delta create_kmalloc_caches 270 214 -56 $ ./scripts/bloat-o-meter vmlinux.old vmlinux.patch_1-6 add/remove: 1/2 grow/shrink: 6/64 up/down: 872/-1172 (-300) Function old new delta create_kmalloc_caches 270 155 -115 We can see that it really gets the benefits. Besides, KMALLOC_DMA will be initialized after "slab_state =3D UP", this does not seem to be necessary. Commit f97d5f634d3b ("slab: Common function to create the kmalloc array") introduces create_kmalloc_caches(). And I found that for SLAB, KMALLOC_DMA is initialized before "slab_state =3D UP". But for SLUB, KMALLOC_DMA is initialized after "slab_state =3D UP". Based on this fact, I think it is okay to initialize KMALLOC_DMA before "slab_state =3D UP". Signed-off-by: Pengfei Li --- mm/slab_common.c | 35 ++++++++++++----------------------- 1 file changed, 12 insertions(+), 23 deletions(-) diff --git a/mm/slab_common.c b/mm/slab_common.c index 2aed30deb071..e7903bd28b1f 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -1165,12 +1165,9 @@ void __init setup_kmalloc_cache_index_table(void) size_index[size_index_elem(i)] =3D 0; } =20 -static void __init +static __always_inline void __init new_kmalloc_cache(int idx, enum kmalloc_cache_type type, slab_flags_t fl= ags) { - if (type =3D=3D KMALLOC_RECLAIM) - flags |=3D SLAB_RECLAIM_ACCOUNT; - kmalloc_caches[type][idx] =3D create_kmalloc_cache( kmalloc_info[idx].name[type], kmalloc_info[idx].size, flags, 0, @@ -1185,30 +1182,22 @@ new_kmalloc_cache(int idx, enum kmalloc_cache_typ= e type, slab_flags_t flags) void __init create_kmalloc_caches(slab_flags_t flags) { int i; - enum kmalloc_cache_type type; =20 - for (type =3D KMALLOC_NORMAL; type <=3D KMALLOC_RECLAIM; type++) { - for (i =3D 0; i < KMALLOC_CACHE_NUM; i++) { - if (!kmalloc_caches[type][i]) - new_kmalloc_cache(i, type, flags); - } - } + for (i =3D 0; i < KMALLOC_CACHE_NUM; i++) { + if (!kmalloc_caches[KMALLOC_NORMAL][i]) + new_kmalloc_cache(i, KMALLOC_NORMAL, flags); =20 - /* Kmalloc array is now usable */ - slab_state =3D UP; + new_kmalloc_cache(i, KMALLOC_RECLAIM, + flags | SLAB_RECLAIM_ACCOUNT); =20 #ifdef CONFIG_ZONE_DMA - for (i =3D 0; i < KMALLOC_CACHE_NUM; i++) { - struct kmem_cache *s =3D kmalloc_caches[KMALLOC_NORMAL][i]; - - if (s) { - kmalloc_caches[KMALLOC_DMA][i] =3D create_kmalloc_cache( - kmalloc_info[i].name[KMALLOC_DMA], - kmalloc_info[i].size, - SLAB_CACHE_DMA | flags, 0, 0); - } - } + new_kmalloc_cache(i, KMALLOC_DMA, + flags | SLAB_CACHE_DMA); #endif + } + + /* Kmalloc array is now usable */ + slab_state =3D UP; } #endif /* !CONFIG_SLOB */ =20 --=20 2.21.0