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To: "Vlastimil Babka (SUSE)" , Ming Lei Cc: Harry Yoo , Hao Li , Andrew Morton , Christoph Lameter , David Rientjes , Roman Gushchin , linux-mm@kvack.org, linux-kernel@vger.kernel.org, "linux-tegra@vger.kernel.org" References: <20260311-b4-slab-memoryless-barns-v1-0-70ab850be4ce@kernel.org> <8ab58ecb-1fc1-42a1-b67a-c3107de2ece4@kernel.org> From: Jon Hunter Content-Language: en-US In-Reply-To: <8ab58ecb-1fc1-42a1-b67a-c3107de2ece4@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: LO4P265CA0097.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:2bc::16) To DS2PR12MB9750.namprd12.prod.outlook.com (2603:10b6:8:2b0::12) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS2PR12MB9750:EE_|PH7PR12MB8778:EE_ X-MS-Office365-Filtering-Correlation-Id: e048d609-b813-425a-5e85-08de956f7075 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: 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U2FsdGVkX186lpuU3NcrZ+I+v/mMHkUoLrArBWiWIlX5Ybfp8pBeoE1P7s8qNR7Lf4TVD4xs7vHVCjOPcoH1q+62zkw7x4GQLAxp1wRbmV5AlXB80PzusV+xI+CzxLI1gQJ6wbmjk7mBuebbSmASynHbqyzrScRif3RReBLnTuywoEmQAUbD+YHd+AKSS8vCYYyn/W+Yn2CBQz0E2ouQgAhuiwsFQYCljhqnBClvaGhuhPbEF4QoMGB+/LrsYQIQ00zWZECkddSBjxlN+8Rz5mmtXGXz8aBDfnACMlxoyf0QvukmlbpLgQMQc2QyStVjBjAUJ1DUQdVM0k5ovixqB02FtHj0DRtb3FLwxvsltussj59+f9lPsfT4qYvRKqLNqVK7SHOfWr2TA1ap9zVhw8zqwZEWHWqujXmmVmUZHq8KMTkcUMftT6kKkqfElzR0SpS1xfQeblxrsBjS3AZGZyUG1N60Rz9K6IzBNrQW2yKHOaXcQS4c0D9giUWA7V9W2M7e/UY7i1QZCDht4s5vpOOq4WLsJMFeVBh7FiV0Sk2hF7Rr+qTAY27PZjX+rUSSeAZk87GE4KSmfmXbHtRaitASw/mjc6CpxwhPd6hkp9ep45YqvjxdTg0fc8lEE9MN/ReK+ZvhkGr002SZdNTgHo84jQEtLSmlCE1NF4Q66WUUMoPxbvj0E7PIsDOQiTBWsY60Ywvr9Igdg6gkvyLI/f91yuLV3EQXWC9QTUsFeFLfF+RmWEHnuKTBf/vjgaheflKoxzS/Uit3Z0qCnzl2i9ktJv9hKTGHjBpX4+zo/ESIg27M+VAczFoOCQUBwPPz5k9YBtWoz81VDo8TzE92lBF92YsjG9QyGxUyf0nzan74fYfRQXSvDOnk0k4icMbhDNyB6xS8sgQHu+Eyq6YTa0P1CCR2wTi+0rBzl9lOR4zCh3CoOU2uvthx5Anw1yBVpdWiK1+xcyEbXT23KH7 hGis/zAm WW+sR1Ckv1bkmTs1Hlqq2Lxwkfa8N+SdNkMn5FHFlwSvZo36hYX+j2jvK4T8UgHp+hs7JKTB6P536kzKOASW0E+WTbzwK/GcxkVKZeKpVJ0X+DBNQvujcas9wRLNvwhpfeIhZrYHaFmWxDJJ3f5AmFNDHmm7mckUJqw4QeMgs4kpHXBRS8zZMO+xwiW5y/wAPAufFPjyQKXJQBMLMLyC2/fNqNwaIeuXyCRLc/+CDP6UVqUBVoyg3P1xzTstQLIdX3lMfl1hyV4uXb8XWzsWTCI6jAg3GZcMW9QsQZSfQARVgvYUUjjV3jrFIWuXeBOHCxvQXTl2a3nyO7RYBZZTLsn2e2FAf1dPJ9qWGnHqE64G2ywJjPpBmkhU/K4ZCuR8s8k0H9lUHAYOnc4LV+pL9rTXYoTAD91Wt1tZ4wD9Sqe+lldnyc+dRvFt1l++lqWBIqSrNEWvvxBYDinuGDsr1xgUOhwWPGNcYAj4+ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi Vlastimil, On 11/03/2026 17:22, Vlastimil Babka (SUSE) wrote: > On 3/11/26 10:49, Ming Lei wrote: >> On Wed, Mar 11, 2026 at 09:25:54AM +0100, Vlastimil Babka (SUSE) wrote: >>> This is the draft patch from [1] turned into a proper series with >>> incremental changes. It's based on v7.0-rc3. It's too intrusive for a >>> 7.0 hotfix, so we'll only be able to fix/reduce the regression in 7.1. I >>> hope it's acceptable given it's a non-standard configuration, 7.0 is not >>> a LTS, and it's a perf regression, not functionality. >>> >>> Ming can you please retest this on top of v7.0-rc3, which already has >>> fb1091febd66 ("mm/slab: allow sheaf refill if blocking is not >>> allowed"). Separate data point for v7.0-rc3 could be also useful. >>> >>> [1] https://lore.kernel.org/all/c6a01f7e-c6eb-454b-9b9e-734526dd659d@kernel.org/ >>> >>> Signed-off-by: Vlastimil Babka (SUSE) >>> --- >>> Vlastimil Babka (SUSE) (3): >>> slab: decouple pointer to barn from kmem_cache_node >>> slab: create barns for online memoryless nodes >>> slab: free remote objects to sheaves on memoryless nodes >> >> Hi Vlastimil and Guys, >> >> I re-run the test case used in https://lore.kernel.org/all/aZ0SbIqaIkwoW2mB@fedora/ >> >> - v6.19-rc5: 34M >> >> - 815c8e35511d Merge branch 'slab/for-7.0/sheaves' into slab/for-next: 13M >> >> - v7.0-rc3: 13M > > Thanks, that's in line with your previous testing of "mm/slab: allow sheaf > refill if blocking is not allowed" making no difference here. At least we > just learned it helps other benchmarks :) > >> - v7.0-rc3 + the three patches: 24M > > OK. So now it might be really the total per-cpu caching capacity difference. I have also observed a performance regresssion for Linux v7.0-rc for some graphics related tests we run. I bisected to ... # first bad commit: [e47c897a29491ade20b27612fdd3107c39a07357] slab: add sheaves to most caches I came across Ming's report and hence, found this series. I have also tested the 3 patches in this series and it did appear to help with one test, but overall I am still seeing a ~25% performance regression (the tests are taking about 25% longer to run). I am not the owner or author of these specific tests and I have not dived into see exactly what is taking longer, but I just know they are taking longer to run. Anyway, I have not seen any recent updates on this, and so I am not sure if there are any other updates or what the current status of this is? If there are any more patches available I will be happy to test. Thanks! Jon -- nvpublic