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 B6667C433EF for ; Mon, 25 Apr 2022 19:18:31 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 1DCCD6B0096; Mon, 25 Apr 2022 15:18:31 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 18E256B0099; Mon, 25 Apr 2022 15:18:31 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0304E6B009A; Mon, 25 Apr 2022 15:18:30 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay.hostedemail.com [64.99.140.27]) by kanga.kvack.org (Postfix) with ESMTP id EB2886B0096 for ; Mon, 25 Apr 2022 15:18:30 -0400 (EDT) Received: from smtpin13.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id C2E0828315 for ; Mon, 25 Apr 2022 19:18:30 +0000 (UTC) X-FDA: 79396362780.13.0EE9350 Received: from mail-pj1-f46.google.com (mail-pj1-f46.google.com [209.85.216.46]) by imf05.hostedemail.com (Postfix) with ESMTP id 87B72100052 for ; Mon, 25 Apr 2022 19:18:24 +0000 (UTC) Received: by mail-pj1-f46.google.com with SMTP id gj17-20020a17090b109100b001d8b390f77bso249544pjb.1 for ; Mon, 25 Apr 2022 12:18:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:from:to:cc:subject:in-reply-to:message-id:references :mime-version; bh=EGrHpQVhbDy5vwZTzhNYK8llc1wnwOLu4wV+jMnBYL4=; b=CaYfhw1w1zCr1TOBWVJ1EiBOGCE0EIxtakImw+XtoEW5vt84RvGptzaYqbrW+innlW +Ku88xj7fg/qsjLAFb4N18ZNeray/Se5SHppUK9OjBl0eB9PHNzoDM2LRPg44ycpi2SJ bjNRJBVIyxkZFe/hZdtOD8UmyZHIiFgfVHm/j3HrJhsuwLJY0Ai5lzZzWklY6oXEwfoZ X7ZFQXszl2q6IOU7xV6dHIkOdnvDUSnutDtxLMhn9QduayUHVDPPQG/uD1X4QAkQnYHM EQ8yY7q6UexyNDJjNR/gFIP/T28r2m2aPkka5RBsU4xqbdHtPNIkvuAc9lKgiFIULCS0 BWcQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:in-reply-to:message-id :references:mime-version; bh=EGrHpQVhbDy5vwZTzhNYK8llc1wnwOLu4wV+jMnBYL4=; b=mtnk8WoNI5xogQQgwR4My/mi5Eh4IA4HjrWV0PzfGGS7TPUpm8TEvjYO9Qs6H5F7xF KzijFDbUMzFD0uDOvhD0gSShIl/ZDk4B/ISmeY7IcefS7ibYh5rhbs0Jcw+YdU6LGlb5 4LjdF7WQ/Qgrm8pLUvFByozMQ8vITWghPUcWAf28/tk28p9L1cb1rk9Nni5Fl3fNqSTy TbxzOmFRAXcknVh97uJbOf5VRIYLkwqPNe7XueItQys7gbCtOhOdrCwAgwNxBJFJqzCQ VURFL6GBRuECUzP0qr6imgeOGKyuDf2tmg2/YKRLziqT53VDCYSsRVVmnrEfzOMKD4cT xmvw== X-Gm-Message-State: AOAM533QojgPDh+bsaYI/Xb4p0nmqBKHiRTrkYU1HYj9ASzsKn2uYSmE Dtg1pYl/TIaUDtEtc/e2sRaV0g== X-Google-Smtp-Source: ABdhPJxe80YjpMyc42uGIuBN4k1cDxK/sBI8c3/84Wz3/UZEwe35L5kGW2HFgSQ97+l0cr2C45Zhpw== X-Received: by 2002:a17:902:7244:b0:158:41d3:b79b with SMTP id c4-20020a170902724400b0015841d3b79bmr19870661pll.50.1650914309214; Mon, 25 Apr 2022 12:18:29 -0700 (PDT) Received: from [2620:15c:29:204:185b:8dcc:84d4:fb71] ([2620:15c:29:204:185b:8dcc:84d4:fb71]) by smtp.gmail.com with ESMTPSA id x1-20020a17090a970100b001cd4989ff41sm97989pjo.8.2022.04.25.12.18.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Apr 2022 12:18:28 -0700 (PDT) Date: Mon, 25 Apr 2022 12:18:28 -0700 (PDT) From: David Rientjes To: Yosry Ahmed cc: Johannes Weiner , Michal Hocko , Shakeel Butt , Andrew Morton , Roman Gushchin , Tejun Heo , Zefan Li , Jonathan Corbet , Shuah Khan , Yu Zhao , Dave Hansen , Wei Xu , Greg Thelen , Chen Wandun , Vaibhav Jain , =?UTF-8?Q?Michal_Koutn=C3=BD?= , Tim Chen , cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH v5 3/4] selftests: cgroup: fix alloc_anon_noexit() instantly freeing memory In-Reply-To: <20220425190040.2475377-4-yosryahmed@google.com> Message-ID: References: <20220425190040.2475377-1-yosryahmed@google.com> <20220425190040.2475377-4-yosryahmed@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Stat-Signature: sbfxe6xbpe6a5g756tq7jmbo8i43ta7h X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 87B72100052 X-Rspam-User: Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=CaYfhw1w; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf05.hostedemail.com: domain of rientjes@google.com designates 209.85.216.46 as permitted sender) smtp.mailfrom=rientjes@google.com X-HE-Tag: 1650914304-777190 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 Mon, 25 Apr 2022, 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 Acked-by: David Rientjes