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=-13.6 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL 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 D81CAC07E9C for ; Wed, 7 Jul 2021 21:14:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B9D886139A for ; Wed, 7 Jul 2021 21:14:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232672AbhGGVRR (ORCPT ); Wed, 7 Jul 2021 17:17:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46934 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229829AbhGGVRQ (ORCPT ); Wed, 7 Jul 2021 17:17:16 -0400 Received: from mail-yb1-xb2b.google.com (mail-yb1-xb2b.google.com [IPv6:2607:f8b0:4864:20::b2b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0CD08C06175F for ; Wed, 7 Jul 2021 14:14:34 -0700 (PDT) Received: by mail-yb1-xb2b.google.com with SMTP id k184so5351459ybf.12 for ; Wed, 07 Jul 2021 14:14:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=loWkjzY4e1q1zoZHIoGMbkPYSZPWyE4TminLeGzRfZ0=; b=JYYnHEW7ZNH43ntTgEZBKHhzqpowBI6y3rHjrmF5uvkQzSK4HhKY0mp3BfQMD3/Me/ 6OXpZA7yQkqZkYGTvHRXjbdhgH8yUWMeVMJpNs13YFwpbsqeka2BQtk/TqKJe+7Mx9fj 2pgDhA88Y7yo0+4F2gl69EALQnn5KkkyHqDfpPbOaeKXV0r+RxcDC49qXe9BXJ+0Hne3 MrW64UATyDb00486dDYc2Lm6aktcqib+A4x3UUSTjrqjrN0DS5ytMkoOInQNvYIDgmG0 ucPCheNEKs6Hnzo3s3bKKEuXk4xj70d1LmyhuXmaK+DF9djnGA2617HjbhhUOtMAFVc4 uUXw== 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=loWkjzY4e1q1zoZHIoGMbkPYSZPWyE4TminLeGzRfZ0=; b=eDrXvGvLatKzrKhPDvOkclKtpjDr7nY04kL7CNYFM729XBHwJd2+AerRJcD6wrUxOM PVoVfpqnfh1aRDfMXeu8Fsel2tYp1zoOW58FBTeb5FbD7P5jy8bq5ZDYJ1qrnlImLcQF vWPZDslav/+W/FTkpe2d/aFc3O4zsDWo7BUAUqRa3LpKM9AzqNGxXoVVxfigHPjVpux/ aD8SCnjXl13E0rBBGoijDLVkPd98qXHcvmkBsBsOFMx5X/cJbwhIMlb6DUUIJyRkZI7L xFCCm+dDoWjxuyBKzshmWeNmuGfxa0AaNREVvrsmG30xQwWXCQuXOv6R4+MSwRRqwf/Y tBMw== X-Gm-Message-State: AOAM530upAZEnlUwLdoc0u1Qd9f7/Q4RBPp6Y/XeX+cKMsHsnBT/rMPc JqHqVgJAoA3yZ8BSf8newZBS+hYVLNgEF1un02OjRQ== X-Google-Smtp-Source: ABdhPJwM1mTHA+Yqp9+iHV/qUeiY6igQYDtZUXENSPDMhTdqNdCJj848vaMBr7B12VFjkhhekQQQBKu5fJF0P0TR+Gc= X-Received: by 2002:a25:83ca:: with SMTP id v10mr35894945ybm.84.1625692473923; Wed, 07 Jul 2021 14:14:33 -0700 (PDT) MIME-Version: 1.0 References: <20210623192822.3072029-1-surenb@google.com> <20210702152724.7fv5tnik4qlap6do@wittgenstein> In-Reply-To: From: Suren Baghdasaryan Date: Wed, 7 Jul 2021 14:14:23 -0700 Message-ID: Subject: Re: [PATCH 1/1] mm: introduce process_reap system call To: Michal Hocko Cc: David Hildenbrand , Christian Brauner , Andy Lutomirski , Johannes Weiner , Andrew Morton , David Rientjes , Matthew Wilcox , Roman Gushchin , Rik van Riel , Minchan Kim , Christian Brauner , Christoph Hellwig , Oleg Nesterov , Jann Horn , Shakeel Butt , Tim Murray , Linux API , Linux-MM , LKML , Android Kernel Team Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 7, 2021 at 5:38 AM Michal Hocko wrote: > > On Mon 05-07-21 09:41:54, David Hildenbrand wrote: > > On 02.07.21 17:27, Christian Brauner wrote: > [...] > > > That one was my favorite from the list I gave too but maybe we can > > > satisfy Andy too if we use one of: > > > - process_mfree() > > > - process_mrelease() > > > > > > > FWIW, I tend to like process_mrelease(), due to the implied "release" ("free > > the memory if there are no other references") semantics. > > Agreed. Ok, sounds like process_mrelease() would be an acceptable compromise. > > > Further, a new > > syscall feels cleaner than some magic sysfs/procfs toggle. Just my 2 cents. > > Yeah, proc based interface is both tricky to use and kinda ugly now that > pidfd can solve all at in once. Sounds good. Will keep it as is then. > My original preference was a more generic kill syscall to allow flags > but a dedicated syscall doesn't look really bad either. Yeah, I have tried that direction unsuccessfully before arriving at this one. Hopefully it represents the right compromise which can satisfy everyone's usecase. > -- > Michal Hocko > SUSE Labs