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Wed, 17 Jun 2026 05:26:03 -0700 (PDT) Date: Wed, 17 Jun 2026 14:26:01 +0200 From: Michal =?utf-8?Q?Koutn=C3=BD?= To: Li Wang Cc: akpm@linux-foundation.org, tj@kernel.org, longman@redhat.com, roman.gushchin@linux.dev, hannes@cmpxchg.org, yosry@kernel.org, jiayuan.chen@linux.dev, nphamcs@gmail.com, chengming.zhou@linux.dev, shuah@kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Michal Hocko , Muchun Song , Shakeel Butt Subject: Re: [PATCH v7 2/8] selftests/cgroup: avoid OOM in test_swapin_nozswap Message-ID: References: <20260424040059.12940-1-li.wang@linux.dev> <20260424040059.12940-3-li.wang@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="n7t6jkbdigw2ibo4" Content-Disposition: inline In-Reply-To: <20260424040059.12940-3-li.wang@linux.dev> --n7t6jkbdigw2ibo4 Content-Type: text/plain; protected-headers=v1; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [PATCH v7 2/8] selftests/cgroup: avoid OOM in test_swapin_nozswap MIME-Version: 1.0 On Fri, Apr 24, 2026 at 12:00:53PM +0800, Li Wang wrote: > test_swapin_nozswap can hit OOM before reaching its assertions on some > setups. Is it because of differences in available IO or what does it depend on? > The test currently sets memory.max=3D8M and then allocates/reads > 32M with memory.zswap.max=3D0, which may over-constrain reclaim and kill > the workload process. >=20 > Replace hardcoded sizes with PAGE_SIZE-based values: > - control_allocation_size =3D PAGE_SIZE * 512 > - memory.max =3D control_allocation_size * 3 / 4 > - minimum expected swap =3D control_allocation_size / 4 >=20 > This keeps the test pressure model intact (allocate/read beyond memory.ma= x to > force swap-in/out) while making it more robust across different environme= nts. I see you used allocation value that is preserve absolute values from 64k s= ystems test is differnt on 4k ones. Any specific reason for that? Thanks, Michal --n7t6jkbdigw2ibo4 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iJEEABYKADkWIQRCE24Fn/AcRjnLivR+PQLnlNv4CAUCajKSVRsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMiwyLDIACgkQfj0C55Tb+AhqQQEAhKvnU2uXdtmJBVHmhU0h vihGBStgNmEeFai/1TzvfbMA/jfIjPkmuNEjQrWZRoxCNCCn746++JvMF9TKwDBC VKQL =xbR8 -----END PGP SIGNATURE----- --n7t6jkbdigw2ibo4--