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=-4.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 300FCC2D0A3 for ; Tue, 3 Nov 2020 21:32:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F2B902236F for ; Tue, 3 Nov 2020 21:32:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604439170; bh=fDp4Wml/YGpQsB8LDO1P9y5TF/9WZMbs7i1O8E0PlBs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=FHUmcL9XBjWMyAegepbsjtKNwr5AMy8qYohDyBidDjGAH1S1D8BUGn4FIQEWw9Oq8 EM3Cn4KqkcsiFo6R7aZqYUxmo2uK4q3Fj0p2sT8aTFBTCmkVM4OzLfXQAIstxCqS6K 1Is0T+4a/a7gTYV+9DRlWgH0M125hk0ikAQ2nPuU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387864AbgKCVcr (ORCPT ); Tue, 3 Nov 2020 16:32:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57058 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730581AbgKCVcd (ORCPT ); Tue, 3 Nov 2020 16:32:33 -0500 Received: from mail-pl1-x634.google.com (mail-pl1-x634.google.com [IPv6:2607:f8b0:4864:20::634]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 51737C0613D1; Tue, 3 Nov 2020 13:32:33 -0800 (PST) Received: by mail-pl1-x634.google.com with SMTP id p4so1879282plr.1; Tue, 03 Nov 2020 13:32:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=0Rflj5FeVFQvvR71X1g+Z0EkePu6R/sIbeOUdmV31Zo=; b=SM5hm/s/rUbBqvOtec7WpIsvEOMJPkG934FXjlJcEmBErrV8eJeFro3qH2XeaSIzZy vN6NJlmKIWtxmUfYzOWd6k36JMaF/+tRiMDavvHwJlYQvvtyJQzNo4WMp3RSmR1xSGwY rSTkSeyQeId5RJaJS1LCnpo134QaLxaYNvv1RqScfZFO0kkHebOHk+6gosud/2dzZEer nldUB9sQt32LyCSeC5Dd+bwYHUpzqGXRfHbk6W8hXYc3nGw/ANWmO6h6LnBumcLVAgon /OZB2GUSWXzAwz/qL9wOS1WGPtO/wnulhCS2HfhNr1U9noCdzBTDCRdqBLTqIATtdxLc UlwQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to; bh=0Rflj5FeVFQvvR71X1g+Z0EkePu6R/sIbeOUdmV31Zo=; b=BanFM4P0+zvHr7hYDg09Sc/Ia+w3IFNOBaTfs3/fn+ox2G0RCffyj+bcqsacZCofxR m642saJuyKsmZZoUyRXlVlBXbaQlrDBO/iNmZQnM58hN024VqtT3FHniUc393squSX79 KUidpShc9h6eLIqXDHu7fW9LKVLIPL1pCTkoRhQLtafQXSzcy2hm1OfU9g2FbAKsx0oB i5JSMVCpskvej2x/Ls0yvCRF/Dlr9JWEW3MyJitNXiUOCo3AxsQvPhYdtxSMGCRQcuu/ W4AlPCnjnwl9OzwFu5/7u7hiKfKLqakiYm/UFhiOrvSTaRN7ESf9mJ7cQJDRVYrHECTe +tvQ== X-Gm-Message-State: AOAM530klED2bEnlp7+KJnhm1cc64yxGRhbD9Q1vwizfEaUzkcCFfQ6K vvYaMzAn+NaqQub5NMxHE3c= X-Google-Smtp-Source: ABdhPJxfymqYguZC9tMMm4xPTSJq8KyM1kPmTukDkHGwybfrB40JI6+eLDF4l0XvD9SuZiCqxA26YA== X-Received: by 2002:a17:902:aa97:b029:d5:ac09:c5ec with SMTP id d23-20020a170902aa97b02900d5ac09c5ecmr26100575plr.78.1604439152426; Tue, 03 Nov 2020 13:32:32 -0800 (PST) Received: from google.com ([2620:15c:211:201:7220:84ff:fe09:5e58]) by smtp.gmail.com with ESMTPSA id a10sm91190pjq.17.2020.11.03.13.32.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Nov 2020 13:32:31 -0800 (PST) Sender: Minchan Kim Date: Tue, 3 Nov 2020 13:32:28 -0800 From: Minchan Kim To: Michal Hocko Cc: Suren Baghdasaryan , linux-api@vger.kernel.org, linux-mm , Andrew Morton , David Rientjes , Matthew Wilcox , Johannes Weiner , Roman Gushchin , Rik van Riel , Christian Brauner , Oleg Nesterov , Tim Murray , kernel-team , LKML , Mel Gorman Subject: Re: [RFC]: userspace memory reaping Message-ID: <20201103213228.GB1631979@google.com> References: <20201014120937.GC4440@dhcp22.suse.cz> <20201015092030.GB22589@dhcp22.suse.cz> <20201103093550.GE21990@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201103093550.GE21990@dhcp22.suse.cz> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Nov 03, 2020 at 10:35:50AM +0100, Michal Hocko wrote: > On Mon 02-11-20 12:29:24, Suren Baghdasaryan wrote: > [...] > > To follow up on this. Should I post an RFC implementing SIGKILL_SYNC > > which in addition to sending a kill signal would also reap the > > victim's mm in the context of the caller? Maybe having some code will > > get the discussion moving forward? > > Yeah, having a code, even preliminary, might help here. This definitely > needs a good to go from process management people as that proper is land > full of surprises... Just to remind a idea I suggested to reuse existing concept fd = pidfd_open(victim process) fdatasync(fd); close(fd);