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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 043F8C3DA7D for ; Thu, 5 Jan 2023 10:49:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233089AbjAEKtC (ORCPT ); Thu, 5 Jan 2023 05:49:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233263AbjAEKsY (ORCPT ); Thu, 5 Jan 2023 05:48:24 -0500 Received: from mail-ed1-x52f.google.com (mail-ed1-x52f.google.com [IPv6:2a00:1450:4864:20::52f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0EC4A4FD69; Thu, 5 Jan 2023 02:48:18 -0800 (PST) Received: by mail-ed1-x52f.google.com with SMTP id c17so52240394edj.13; Thu, 05 Jan 2023 02:48:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:from:to:cc:subject:date:message-id :reply-to; bh=6qLrWDP8UxJVLXXHnMyGiQx4P9YZKALZZuu63FSiH6E=; b=E9K3NJxE30vOeMc0DOcQs6pSTojhjB7VLiWumrWgtVBlynfouL2iOIIZjBQlA011se 3PvotfAYQx0uvyVsV3uk2OY3h3brtmDIxPl0L48Xy8zFsV6malBcnPUYTgNZrdVinMNX F6nb6b7Kjjw6m4lsrqnpiUNq4ILqGBfJvKObH6L0rUNZm18rkzP4w2xGkHzp1FHa9Rvm BLtL0upydoAO/nkIVsz/9wUmDjnhGBIRLg1YpwRWuJ5aGyCVTrjf2bD6lUHK6fvkyEB+ S2B3dOJ/J6rg9ekk6KoVGdA+Qi0yaOxNng0aL9zuTM2bJBEByO6xvhdLSifOUP6wEZKk klYw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=6qLrWDP8UxJVLXXHnMyGiQx4P9YZKALZZuu63FSiH6E=; b=EHCTtM3BcMG3gt34KEZ8rUD8DMMBgtgohm1NjoYp3tYX3sG0qBfh6d19jdEi4gdSbr Y+1XpesdR+Nr7dW94vji0NjMjpXV85VMNtZUXbbxhDUdX4w0Mq5bjHsmpqAa8IR67jrh RafNEZy6lv3baO0jnQJbu14iRuORLJyotjbh6Kf3pQuZEj1SHOXS9NRk/X0XnkPbqBBo 4dz+kI7l7SnnjBLAvr5CXivuVcmVW4Zhl61UU5/9hDL+FmHRUtrvwhn+sZCcjXP4m0uv LbyFSpu3uNXarNn1ku+oKsLYz6j348f1zNsi906SdHOr0Xr4wb4yZ9fjHE9juofhAqgc Eyng== X-Gm-Message-State: AFqh2kqCiEdBm8+hvPu8IGQCDTK1UcopyszB0Pb+QaQbsjyvxAnccbNc 95nYCsbmw7xaVJEYdULTZSI= X-Google-Smtp-Source: AMrXdXuJWhyrmy1YZjk6sB1ll1kMT60CGgwsH2fEDRfVrLmdIwzKXMnsgcamI+al2donwj3dOaq/aw== X-Received: by 2002:a05:6402:3784:b0:46d:cead:4eab with SMTP id et4-20020a056402378400b0046dcead4eabmr46314439edb.6.1672915696661; Thu, 05 Jan 2023 02:48:16 -0800 (PST) Received: from gmail.com (1F2EF380.nat.pool.telekom.hu. [31.46.243.128]) by smtp.gmail.com with ESMTPSA id x11-20020a170906b08b00b007806c1474e1sm16297503ejy.127.2023.01.05.02.48.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Jan 2023 02:48:15 -0800 (PST) Sender: Ingo Molnar Date: Thu, 5 Jan 2023 11:48:13 +0100 From: Ingo Molnar To: Aaron Thompson Cc: Mike Rapoport , linux-mm@kvack.org, "H. Peter Anvin" , Alexander Potapenko , Andrew Morton , Andy Shevchenko , Ard Biesheuvel , Borislav Petkov , Darren Hart , Dave Hansen , David Rientjes , Dmitry Vyukov , Ingo Molnar , Marco Elver , Thomas Gleixner , kasan-dev@googlegroups.com, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, x86@kernel.org Subject: Re: [PATCH v2 1/1] mm: Always release pages to the buddy allocator in memblock_free_late(). Message-ID: References: <010101857bbc3a41-173240b3-9064-42ef-93f3-482081126ec2-000000@us-west-2.amazonses.com> <20230105041650.1485-1-dev@aaront.org> <010001858025fc22-e619988e-c0a5-4545-bd93-783890b9ad14-000000@email.amazonses.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <010001858025fc22-e619988e-c0a5-4545-bd93-783890b9ad14-000000@email.amazonses.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Aaron Thompson wrote: > For example, on an Amazon EC2 t3.micro VM (1 GB) booting via EFI: > > v6.2-rc2: > # grep -E 'Node|spanned|present|managed' /proc/zoneinfo > Node 0, zone DMA > spanned 4095 > present 3999 > managed 3840 > Node 0, zone DMA32 > spanned 246652 > present 245868 > managed 178867 > > v6.2-rc2 + patch: > # grep -E 'Node|spanned|present|managed' /proc/zoneinfo > Node 0, zone DMA > spanned 4095 > present 3999 > managed 3840 > Node 0, zone DMA32 > spanned 246652 > present 245868 > managed 222816 # +43,949 pages [ Note the annotation I added to the output - might be useful in the changelog too. ] So this patch adds around +17% of RAM to this 1 GB virtual system? That looks rather significant ... Thanks, Ingo