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=-2.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 B3D2BCA9EC0 for ; Mon, 28 Oct 2019 15:56:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 81C0620717 for ; Mon, 28 Oct 2019 15:56:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=cmpxchg-org.20150623.gappssmtp.com header.i=@cmpxchg-org.20150623.gappssmtp.com header.b="vKvw+2Qo" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390747AbfJ1P4U (ORCPT ); Mon, 28 Oct 2019 11:56:20 -0400 Received: from mail-qt1-f193.google.com ([209.85.160.193]:37920 "EHLO mail-qt1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730109AbfJ1P4U (ORCPT ); Mon, 28 Oct 2019 11:56:20 -0400 Received: by mail-qt1-f193.google.com with SMTP id t26so5212617qtr.5 for ; Mon, 28 Oct 2019 08:56:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cmpxchg-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=W+oVyHGwOHNWyoBXA1OJvT64Ll72Qyn+h/rilXVin2s=; b=vKvw+2Qoar3/HPbIdHr8xSut0Z//5biMVB/Q8OmS6BJwlVkgqUFgW6dCio2Zk/mYUp vLZazr0F0yN2/i7CKag2kenLrdAub0fw1+oU+dVyoU61hpb6Em9cpzTGul5uIV+NC86h c3C69ZRZ0V5ChouD1WyWiV1dPHA32ShChQb3mBcgynN2hpSIB2zzai3K0MO12HWL+gsf rMd/P0eeVujkLc59En1DPYihGovvQtlgww+1/w+MWZgHl7c7EhfhSisrZZhkcWImt4GR yGTkhQmjfuO5rI3jZQlUdn/VcmexeSilhaZlIVpU1aK3U8xHjtce20z3WZuufXzqtGZY 6suA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=W+oVyHGwOHNWyoBXA1OJvT64Ll72Qyn+h/rilXVin2s=; b=Dk86JamTtAx14W5YT5hyOSiyUaOG6PpDbzOj0xOOGGRyQuh6qg6tcCpiuNeK0Nt+xu RQ0+6U7exY4OP2kYQ2VrnmASfSzxjCcYQTnfmXA1xb/j0332F3pRK8cE0esSBKB1oK6b eylZK4lrfC5kQ1EkLVTCPJVhH99KSXnpx5dAQCY69pLlgpxJUd8LBLna7dz5oTvvN9cj g0OuUyXdpBrUHneMYKXQ6rhGrrGDlpGbfy5/WRGFsMVXLDk2COsOgB2PhNKSmgW1AaWB OyspYPgfhYeSzGnX9nOUaqVCIjpz8ltAgwvvUy99g8enNlNLwE0kVrlLyQpC3uf5rzsg 1cWA== X-Gm-Message-State: APjAAAVIzrchsmdaceEX7IUMGYbN7ooee2V7p3uAwbclqqv1aNALTxE/ SekN6KDcPiv9K0fYlejEOHacnw== X-Google-Smtp-Source: APXvYqwI2x6YJ5JZqZ7aWNVaxYvjj2xliLFgGj2bKqgA36cdsGDCOqrgbSEDrDuWmR9RZXzacKlzXw== X-Received: by 2002:ac8:548f:: with SMTP id h15mr18225602qtq.176.1572278179077; Mon, 28 Oct 2019 08:56:19 -0700 (PDT) Received: from localhost ([2620:10d:c091:500::2:831b]) by smtp.gmail.com with ESMTPSA id w24sm3520903qta.44.2019.10.28.08.56.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 28 Oct 2019 08:56:18 -0700 (PDT) Date: Mon, 28 Oct 2019 11:56:17 -0400 From: Johannes Weiner To: Hillf Danton Cc: linux-mm , Andrew Morton , linux-kernel , Matthew Wilcox , Michal Hocko , Shakeel Butt , Minchan Kim , Mel Gorman , Vladimir Davydov , Jan Kara Subject: Re: [RFC v2] mm: add page preemption Message-ID: <20191028155617.GA3156@cmpxchg.org> References: <20191026112808.14268-1-hdanton@sina.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191026112808.14268-1-hdanton@sina.com> User-Agent: Mutt/1.12.2 (2019-09-21) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Oct 26, 2019 at 07:28:08PM +0800, Hillf Danton wrote: > > The cpu preemption feature makes a task able to preempt other tasks > of lower priorities for cpu. It has been around for a while. > > This work introduces task prio into page reclaiming in order to add > the page preemption feature that makes a task able to preempt other > tasks of lower priorities for page. > > No page will be reclaimed on behalf of tasks of lower priorities ... at which point they'll declare OOM and kill the high-pri task? Please have a look at the cgroup2 memory.low control. This memory prioritization problem has already been solved.