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=-3.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, 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 F15DDC433E1 for ; Sat, 22 Aug 2020 16:06:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CC67720738 for ; Sat, 22 Aug 2020 16:06:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598112371; bh=wwRY/NHzLLJH7Pz6XeoDUl6RhGYuBFHXf7ymbvyB7Fw=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=jB3FzeoTvMYkDj28S3PnBHgKL47lIQ5V2lrj9LmNB9Bg1ceymykmorq89viQtoPK4 nTPpYiurZ1GF93uphpCFCeA01ItsudC0pWhDO0RDD3DYqNnIuf5cIGRuWxqcmVmu+1 jwrOmEioI4p+rSgzGXzYWI+/05j8UqkAzRpc2WKI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728300AbgHVQGK (ORCPT ); Sat, 22 Aug 2020 12:06:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55304 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727858AbgHVQF5 (ORCPT ); Sat, 22 Aug 2020 12:05:57 -0400 Received: from mail-lj1-x243.google.com (mail-lj1-x243.google.com [IPv6:2a00:1450:4864:20::243]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B9E1DC061573 for ; Sat, 22 Aug 2020 09:05:56 -0700 (PDT) Received: by mail-lj1-x243.google.com with SMTP id i10so5081327ljn.2 for ; Sat, 22 Aug 2020 09:05:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=PCOteyGRyHLlleJ2kVYBfkztXYhY3DPXBVegbukXECs=; b=XgLZo1E3UlNm7AbkzgPPqXS4AkCdSZRGFs3Tgq0bXjoZdTMa2MO3QW3EmND8SAWUIH 5Odo+4Pfl+8aylwqwbGkF+AenDA2NrCtmrCAeKGUhE3JdiuQrDKS7Lz00QSpvrFSCJRC nHvVCVnIjn1UrZTJPtou0UEuYag9SNOF1sI3A= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=PCOteyGRyHLlleJ2kVYBfkztXYhY3DPXBVegbukXECs=; b=BIxrVp/orwDZnFIaV41mZq0sc/o3gAQSwF2Jk/7QY7b3Wbc62IxI15NfxIeQdPCvAv NQQhop/QWvYGX6CSyPCo/+iyu49/j4CCfKCCroMwnmfYBwxjewBR5VQDCHyu3uJM0a0Y FsEdEj8kgh3HIGhjAQpesmyCo4S+/QfKQY17XTGoEERM9Tmdc/IMMg9Q57pAZYYAOZ6z 8Y76cWush83B6Y4dl5KEZk9ij3ORQ0Qi6yDLHGIujVHc/lFkJWhPKW4sKM5u037ISbo7 3Vh0FM0sn2CdK+bK6xs8ch/5MilOd7M2wB/5AgFhyghPAoITahNLBiz+Wz6ydZY/Sd2h rqtQ== X-Gm-Message-State: AOAM533k1fQ5cZGE3+Qvfta58m6qTc0tA5m7W2X0oQPJtEQUKOMcKNEF iKdfkcYRDD1RJX68MRl7SnvriBucO7CoVw== X-Google-Smtp-Source: ABdhPJyTK+omIP+Xb9maXiB3Rk/m1a8hHkhCMaqfSzDfH1dl+WXsBctNKQAHrVOgYPwcxH2K3nbVOw== X-Received: by 2002:a2e:a370:: with SMTP id i16mr4135560ljn.22.1598112354688; Sat, 22 Aug 2020 09:05:54 -0700 (PDT) Received: from mail-lj1-f174.google.com (mail-lj1-f174.google.com. [209.85.208.174]) by smtp.gmail.com with ESMTPSA id c17sm1084290lfr.23.2020.08.22.09.05.53 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 22 Aug 2020 09:05:53 -0700 (PDT) Received: by mail-lj1-f174.google.com with SMTP id g6so5046597ljn.11 for ; Sat, 22 Aug 2020 09:05:53 -0700 (PDT) X-Received: by 2002:a05:651c:503:: with SMTP id o3mr4223772ljp.312.1598112353202; Sat, 22 Aug 2020 09:05:53 -0700 (PDT) MIME-Version: 1.0 References: <20200821234958.7896-1-peterx@redhat.com> In-Reply-To: <20200821234958.7896-1-peterx@redhat.com> From: Linus Torvalds Date: Sat, 22 Aug 2020 09:05:37 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 0/4] mm: Simplfy cow handling To: Peter Xu Cc: Linux-MM , Linux Kernel Mailing List , "Maya B . Gokhale" , Yang Shi , Marty Mcfadden , Kirill Shutemov , Oleg Nesterov , Jann Horn , Jan Kara , Kirill Tkhai , Andrea Arcangeli , Christoph Hellwig , Andrew Morton Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Aug 21, 2020 at 4:50 PM Peter Xu wrote: > > - Run a busy loop dirty program [1] that uses 6G of memory, restrict to 1G > RAM + 5G swap (cgroup). A few hours later, all things still look good. > Make sure to observe (still massive) correct page reuses using the new > counter using the last patch, probably when swapping in. > > - Run umapsort [2] to make sure uffd-wp will work again after applying this > series upon master 5.9-rc1 (5.9-rc1 is broken). I obviously like the diffstat, am wondering if you saw any throughput changes or similar for the busy-loop dirtying thing? Linus