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From: Shakeel Butt To: Jiayuan Chen Cc: linux-mm@kvack.org, Jiayuan Chen , Tejun Heo , Johannes Weiner , Michal =?utf-8?Q?Koutn=C3=BD?= , Jonathan Corbet , Michal Hocko , Roman Gushchin , Muchun Song , Andrew Morton , Yosry Ahmed , Nhat Pham , Chengming Zhou , Shuah Khan , cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH v2 2/2] selftests/cgroup: add test for zswap incompressible pages Message-ID: References: <20260206072220.144008-1-jiayuan.chen@linux.dev> <20260206072220.144008-3-jiayuan.chen@linux.dev> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260206072220.144008-3-jiayuan.chen@linux.dev> X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Rspamd-Queue-Id: 62AF31C0015 X-Rspamd-Server: rspam07 X-Stat-Signature: 635a46tpinr9pihq3a6bi5wbmfm8p5bb X-HE-Tag: 1770401631-677146 X-HE-Meta: U2FsdGVkX19jb6s1AxddCN1fGeNR6RQkWhjXLvVDknmU1L97bajr52IFv0Hf8APfgmVUQ1nahzH9xzXsyiIKLzR0VIwNMlbkHghwBriM8/n/kx1g6ncMFG5E5EuYMLwFOV/FpolBfx81EBkq7nIK1O/8Xsp7jyS/jgLFshwXl5lVudFsLKmwfcNnFrasohfEMMMwZqUqAWFpMCMW6g5oZLW3ZkwjKM99rkc34SY8Vh6nNNGa7KpEehzYN3AQ1FLz4n7H1nl4emfTnDa13Dnk1oelN/thw+neddqFNkze5XqD3kC0CPgEbrdV/qlkm3wq/DBe1OO/B3fl49sQZ9Lg5vk8t/WzrqmcETAGSAwa1Uiwybq9WLCtihhDTGDLzgQ67roJWL+hROE/Km9MR+u2cn/PwLEd6nzCqx1sYM0m6D23VpGAk0Zyj/KlP/Tq7rKryUTcToYomtEc6WBbjv7qs0VSsErpkva4VxGcAqlEL+SwJzDpN4KV31UA8sucn4+DkkZ3GfCVkUPl7WEUpweJd3I7GD06kdPFIS6IEh9eVHxNMma1JvsCs0SgfLW/7cTf+bRy8cHbtrkleFb0IZF1P/I6dK9Ak7uuUU+/S1ttqSeXJJAvAAniL3+AN3lJ6ny0xFKo8xCTt1MJn+z0grJkWx93wp3nMQH7X5n/mlZO/piAMjKDShhXP/1wRlvF8jnyedYM8xZQSg/vJOSb/MOojobMlMPXnzj8oP/Ap4Rloy1u8Lspazqb4SQhsQiLN5FM29nGEjq/lsetWqH6r1aH2AYwm/AsIcwJZoZGC4ppk2GgXzWt44MAoTG4d7nNqSuTr8Q9Zd0sOkUrQ+ei3GspTYDATXfIyaeqg/pnSVZsywHE8DccaXxWMnQgZ5XEnxgRe6zwLqET/NDBsTREMqKnuc6y33ACINGWNrq7OibM+CTNU8mgwzTEh+cnDDIsq4XF6bkZB9SIIjFsHCOo+fn sPqrT5XS FJlplZfFUi+sTBas4/lQnnk4EGySoy9tCOo4ag3BasYz5PInctuRkaRuUNT9BBYZSqVecofTMzfCzrks78ptLTSiu0oYH9I226SzHcDw68BniM+cYrXH0rLej/tEH0gzGvaVxbKl4Pz4jMlihHBjy1lLBL6FTZcLPjBVg6Ap1P7U/s2xVvoq2ibdc4Mrw/tDn4PI7UtsJkBi95V3F33Ux0Y51X5cSHMiNMKbVp4nX912uqNOIovuP5S3lENK/PD0tc3m8/nL6anAYRhexAWQaIkeqXA== 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: List-Subscribe: List-Unsubscribe: On Fri, Feb 06, 2026 at 03:22:16PM +0800, Jiayuan Chen wrote: > From: Jiayuan Chen > > Add test_zswap_incompressible() to verify that the zswap_incomp memcg > stat correctly tracks incompressible pages. > > The test allocates memory filled with random data from /dev/urandom, > which cannot be effectively compressed by zswap. When this data is > swapped out to zswap, it should be stored as-is and tracked by the > zswap_incomp counter. > > The test verifies that: > 1. Pages are swapped out to zswap (zswpout increases) > 2. Incompressible pages are tracked (zswap_incomp increases) > > test: > dd if=/dev/zero of=/swapfile bs=1M count=2048 > chmod 600 /swapfile > mkswap /swapfile > swapon /swapfile > echo Y > /sys/module/zswap/parameters/enabled > > ./test_zswap > TAP version 13 > 1..8 > ok 1 test_zswap_usage > ok 2 test_swapin_nozswap > ok 3 test_zswapin > ok 4 test_zswap_writeback_enabled > ok 5 test_zswap_writeback_disabled > ok 6 test_no_kmem_bypass > ok 7 test_no_invasive_cgroup_shrink > ok 8 test_zswap_incompressible > Totals: pass:8 fail:0 xfail:0 xpass:0 skip:0 error:0 > > Signed-off-by: Jiayuan Chen Acked-by: Shakeel Butt