From nobody Sun Feb 8 17:43:00 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 55F88C7EE2D for ; Mon, 22 May 2023 11:15:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233254AbjEVLOx (ORCPT ); Mon, 22 May 2023 07:14:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58350 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233118AbjEVLOC (ORCPT ); Mon, 22 May 2023 07:14:02 -0400 Received: from mail-ej1-x62f.google.com (mail-ej1-x62f.google.com [IPv6:2a00:1450:4864:20::62f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0FE4D1BD7 for ; Mon, 22 May 2023 04:09:01 -0700 (PDT) Received: by mail-ej1-x62f.google.com with SMTP id a640c23a62f3a-96f683e8855so488862466b.2 for ; Mon, 22 May 2023 04:09:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1684753739; x=1687345739; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=f2bGuuQYL8b+xbvuLn4PcYekQUWt9yPN5iQ314l4lMI=; b=PvB7xNb9ygkZOuxzTtzRZdOhB6MfhJSa/XRAM+BYE1xoLfv+ewUOyX4VD8Bu0FXaOK AXlUTKkyIK2WVRsD39QMuEntv1HpM65yERdXpxKJXgRGMC2pW3R98Ogtx7X6mgbxBHMR ldToVDFezt0XeMtgZh1MaqlUYU2be1G2xPupT/rIWTKOSu/1KFkLMDIX1H3BLSGe29sO Fg3kOpF9fGfKN44fAOhFpBwP9Z7IQ03rJSGvaYH1M1Nh+mhzwxadyfvgGc5HplBYwh3q fzDEE5gFHzKH0XnCa9ZqMPOjoi2odYahJQNJL0GrEIc+/7U+m3d4QYr1A8eWf9czKONh 1f4A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684753739; x=1687345739; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=f2bGuuQYL8b+xbvuLn4PcYekQUWt9yPN5iQ314l4lMI=; b=LM+YizE6+kL5AztjvEBeZDF2GFzwha7k4U7RwKQMWpQlC5JMNqhm1KAaaA4hnrtFXG I+ptpKfoouk7VR7SZ4jMnWH5LYpFJbEPIn25e2fgpOTir9iXRdc9x0XOiPxB1LdxkKVw 4JxJiZPhuaMmSJT9IH+CEFap64ewL8A4YegG5M925mtJjfbLzXnbZXmk7BxyGqCDO80q crpYZFF/lkCakuVppPU8RhlbCkwCaUIMlOPz7mkOAUa3CfE7Z+igvy0lxslRqXvH/38T sAPSZIo8sqZarYSnVIjPaVByT64/qm+gvC9vezWjPoAd/w9IQIILTwniNusmkN+z4ogW eltw== X-Gm-Message-State: AC+VfDxni/6dRANrTBhGmZVtLDUdQTocIkGfh3Lvth9xfnRtwkM7H1ap i9al701hyGLJ2IqiC8NtpXA= X-Google-Smtp-Source: ACHHUZ7OjSrTldnv+rUkfYY8jX9+e0NK8wBEQHN/GocoDZWHojfGcLerDTURKKOgb/QQDOHh1JKUqA== X-Received: by 2002:a17:907:a42a:b0:96f:a7d9:6e86 with SMTP id sg42-20020a170907a42a00b0096fa7d96e86mr6231547ejc.1.1684753739445; Mon, 22 May 2023 04:08:59 -0700 (PDT) Received: from pc638.lan ([155.137.26.201]) by smtp.gmail.com with ESMTPSA id lx19-20020a170906af1300b0094f07545d40sm2949453ejb.220.2023.05.22.04.08.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 May 2023 04:08:59 -0700 (PDT) From: "Uladzislau Rezki (Sony)" To: linux-mm@kvack.org, Andrew Morton Cc: LKML , Baoquan He , Lorenzo Stoakes , Christoph Hellwig , Matthew Wilcox , "Liam R . Howlett" , Dave Chinner , "Paul E . McKenney" , Joel Fernandes , Uladzislau Rezki , Oleksiy Avramchenko Subject: [PATCH 9/9] mm: vmalloc: Scale and activate cvz_size Date: Mon, 22 May 2023 13:08:49 +0200 Message-Id: <20230522110849.2921-10-urezki@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230522110849.2921-1-urezki@gmail.com> References: <20230522110849.2921-1-urezki@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Scale a zone size to number of CPUs. Each power of two value adds extra 100 * PAGE_SIZE bytes to a zone size. A maximum zone size limit is set to 4M, it is reached if number of CPUs=3D1024 and PAGE_SIZE=3D4096 bytes. For 32-bit or single core systems cvz_size is set to ULONG_MAX. It means that a pre-loading technique is deactivated. Signed-off-by: Uladzislau Rezki (Sony) --- mm/vmalloc.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 8054b8bf6c18..a5e6956a8da4 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -806,8 +806,6 @@ struct cpu_vmap_zone { }; =20 static DEFINE_PER_CPU(struct cpu_vmap_zone, cpu_vmap_zone); - -/* Disable a per-cpu caching. */ static __read_mostly unsigned long cvz_size =3D ULONG_MAX; =20 static inline unsigned int @@ -4490,6 +4488,19 @@ static void vmap_init_pcpu_zones(void) spin_lock_init(&z->fbl[j].lock); } } + + /* + * Scale a zone size to number of CPUs. Each power of two + * value adds extra 100 pages to a zone size. A high-threshold + * limit is set to 4M. It can be reached if number of CPUs=3D1024 + * whereas a PAGE_SIZE is 4096 bytes. + */ +#if BITS_PER_LONG =3D=3D 64 + if (i > 1) { + cvz_size =3D fls(i) * (100 * PAGE_SIZE); + cvz_size =3D min(cvz_size, (unsigned long) SZ_4M); + } +#endif } =20 void __init vmalloc_init(void) --=20 2.30.2