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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0034CC433EF for ; Sat, 23 Apr 2022 14:03:17 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 515D06B0073; Sat, 23 Apr 2022 10:03:17 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 49EB46B0074; Sat, 23 Apr 2022 10:03:17 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 318876B0075; Sat, 23 Apr 2022 10:03:17 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay.hostedemail.com [64.99.140.26]) by kanga.kvack.org (Postfix) with ESMTP id 233456B0073 for ; Sat, 23 Apr 2022 10:03:17 -0400 (EDT) Received: from smtpin16.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay11.hostedemail.com (Postfix) with ESMTP id C790681056 for ; Sat, 23 Apr 2022 14:03:15 +0000 (UTC) X-FDA: 79388310750.16.EC86221 Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) by imf04.hostedemail.com (Postfix) with ESMTP id A52314003A for ; Sat, 23 Apr 2022 14:03:12 +0000 (UTC) Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-2eb2bc9018aso93674777b3.18 for ; Sat, 23 Apr 2022 07:03:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=fa8nrg7PnSBHWiz/ixAu3+CbgP2gabmfB3kka70Ad0U=; b=RBzRm8aigFAmC2YQq4Au63IrMg4vk5mNEbXU0HTFREh1S8MkXIo2r1//dLE4dyUX/e 6NozTIV4b1f9CJCUnvT4w7Sx7ybqXpLGTEuCwKk4b3Cr+DCdjlOpNBVoS7xw+1IljbxX WY9TJe1wbjl3aDMWyDZjVVUsZQ+WpulkaJM5CwkywnoIXR0oQof2FUp7skcLKtWIfukx VknJtnGg5S6NNilEWi8UYh+oR7TXcfJ/JyaSL8lv6ju9ciyY4p8a1ydjQvkXybSBiEhR MVC/MmsNWdd9lqggkQCwKJIffrY3xA8wW9Gow+xt10wW2staPBbArzYc4Kx+820Ntvm+ KDpg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=fa8nrg7PnSBHWiz/ixAu3+CbgP2gabmfB3kka70Ad0U=; b=3vkEwQsRMINJWDhmiaEgi9gpxiVKF1laMHgqN1qpbAVLUZBjRz2CqM9CcM4YfbOavg Bn7hVFUnFvQtzRytSVMekF+LHpZfT1aLaOxVa06FWpj997PGZzgFwQau/1WEGC7WM5kD cmdfo7QR17YPH+vZ9h6zJEUieXdnTWBaD+ocibV7yJ1y97IwM3xYoCsdir3yrV/zG+4Z SEpfSaA1uHt1s4fBYJxlZjzjDjvI17kClyx9DCffk+mSVeRA/ic761eqIAzz7oE+Urvz Kk4MOR+WWQOMROrrZJXzvh+AGleB+CEeMKVef6oo3ie7VgRviM1asxukPS1dfPsofiXG BX0w== X-Gm-Message-State: AOAM533Aj3x25vL6LimAh7e5yQR1rQZ52sW6JADvWfmYz2eB2d51kEiW WjdoQV3jL+poSdIX6ANOhAaAgVsRpelTGg== X-Google-Smtp-Source: ABdhPJwStmJpcHiA2mFTxcNMhfws2BRPRjdd+RlFHxUK+bhjIRki3ilpkcFSKTXyuoE3Fh60b9kljL0wiOv+vg== X-Received: from shakeelb.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:28b]) (user=shakeelb job=sendgmr) by 2002:a81:18d7:0:b0:2eb:553e:f3ee with SMTP id 206-20020a8118d7000000b002eb553ef3eemr9135814ywy.393.1650722594556; Sat, 23 Apr 2022 07:03:14 -0700 (PDT) Date: Sat, 23 Apr 2022 14:03:12 +0000 In-Reply-To: <20220421234426.3494842-4-yosryahmed@google.com> Message-Id: <20220423140312.fxsxjwcebvor2x5l@google.com> Mime-Version: 1.0 References: <20220421234426.3494842-1-yosryahmed@google.com> <20220421234426.3494842-4-yosryahmed@google.com> Subject: Re: [PATCH v4 3/4] selftests: cgroup: fix alloc_anon_noexit() instantly freeing memory From: Shakeel Butt To: Yosry Ahmed Cc: Johannes Weiner , Michal Hocko , Andrew Morton , Roman Gushchin , David Rientjes , Tejun Heo , Zefan Li , Jonathan Corbet , Shuah Khan , Yu Zhao , Dave Hansen , Wei Xu , Greg Thelen , Chen Wandun , Vaibhav Jain , "Michal =?utf-8?Q?Koutn=C3=BD?=" , Tim Chen , Dan Schatzberg , cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Content-Type: text/plain; charset="us-ascii" X-Rspamd-Queue-Id: A52314003A X-Stat-Signature: kh8ppwwakkugqsmuoif18ninmfiyyg1r Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=RBzRm8ai; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf04.hostedemail.com: domain of 3IgdkYggKCNkNC5F99G6BJJBG9.7JHGDIPS-HHFQ57F.JMB@flex--shakeelb.bounces.google.com designates 209.85.128.201 as permitted sender) smtp.mailfrom=3IgdkYggKCNkNC5F99G6BJJBG9.7JHGDIPS-HHFQ57F.JMB@flex--shakeelb.bounces.google.com X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1650722592-645484 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Apr 21, 2022 at 11:44:25PM +0000, Yosry Ahmed wrote: > Currently, alloc_anon_noexit() calls alloc_anon() which instantly frees > the allocated memory. alloc_anon_noexit() is usually used with > cg_run_nowait() to run a process in the background that allocates > memory. It makes sense for the background process to keep the memory > allocated and not instantly free it (otherwise there is no point of > running it in the background). > > Signed-off-by: Yosry Ahmed > Acked-by: Roman Gushchin Acked-by: Shakeel Butt