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Wed, 1 Apr 2026 14:08:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775052485; bh=bVa8O4fwTG1tjCVclLBS4//gcP3cU/KztS+qU9zJiIU=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=J76Ug42E+fQObk7s9g8QR0SUmtCwVlz3vosaqR92/k9ma26Whbo+9/s7UKl/KV6QN iAmWdjQAmjwejHm4+4BD4x2j2hiWa8mxr+GnywY/itHAigaanX4Ps/zJdLwZEaA54O dDnZarHpco6Ua9OAj7i3OXebtVUd4jCvbMKZjtTx1y2HgBY3k6pl1e8rgbJ6xtkSyT B3JHJ/b/e1XEx9q9oh0zi3ESYg13hZ3ZH5W6prmZV+gpBsZl2B7DKLoCWXFO3JXKfG MG+3eWARiCMWThrcEVv1W30SVPkgQg8w8hFnFMVPCbsZXfgPeAjn4NgPcuGk5A3+lj fMa7I6BGXFMLQ== Message-ID: <7dadb91c-745d-4fde-8a2b-c141b26823a7@kernel.org> Date: Wed, 1 Apr 2026 16:08:00 +0200 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 04/13] selftest/mm: fix cgroup task placement and drop memory.current checks in hugetlb_reparenting_test.sh To: Sayali Patil , Andrew Morton , Shuah Khan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Ritesh Harjani Cc: Zi Yan , Michal Hocko , Oscar Salvador , Lorenzo Stoakes , Dev Jain , Liam.Howlett@oracle.com, linuxppc-dev@lists.ozlabs.org References: <1ac1cac332a692e8d2dd70922bb09c0582340143.1774591179.git.sayalip@linux.ibm.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 3/27/26 08:15, Sayali Patil wrote: > Launch write_to_hugetlbfs as a separate process and move only its PID > into the target cgroup before waiting for completion. This avoids moving > the test shell itself, prevents unintended charging to the shell, and > ensures hugetlb and memcg accounting is attributed only to the intended > workload. > > Add a short delay before the hugetlb allocation to avoid a race where > memory may be charged before the task migration takes effect, which > can lead to incorrect accounting and intermittent test failures. Isn't there still a chance for a race, for example, when running in a VM? -- Cheers, David