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sheaves To: Hao Li Cc: "Vlastimil Babka (SUSE)" , Ming Lei , Harry Yoo , 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: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: PA7P264CA0496.FRAP264.PROD.OUTLOOK.COM (2603:10a6:102:3da::10) To DS2PR12MB9750.namprd12.prod.outlook.com (2603:10b6:8:2b0::12) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS2PR12MB9750:EE_|DS5PPFC9877909A:EE_ X-MS-Office365-Filtering-Correlation-Id: 39632b4d-87dc-4af5-8ff8-08de9672f017 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: 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 3zKBJ6YG +yekZSnovSCdom65MuuTPhmXu/Xv+ggQnOorqxHBbIsw+r7UYmc0XLuTVubkliZmjNoUWZTw+rPZZGMapPCLkx66OMBvRiPmObOEi4thXrz7hA0088ydqY5yAFVVff3Egdl66fhmTjCdul8rnWLrSFlJ/SrKyPnoQ4Da6QWalH/hxKMmlsleD9s9w9zxfWBroqXUG0KPebjrlPFelJ8798ILMtZxXcd1LzJX8w/NG8XDNbOlogzX5qS8a7hHjDwmh7zZK7gdMwDWl8+v456o5TJnEL5ufUBtA4bpw0JisMyYPYgJ++nNwIvbsqRuqTUqgO2NI/QgT3nuD/TQSA7mccTZBTqGvjiT86b7NhkLpdTmkCuut3jUxqx/BNTDYaAwpvqPJSLf1o+pH3g0g5Pfs8hhtKK8MP2FwOXH/toXyWpKJD769uz5P7urhXgdfuv1LX6GQEke0JBNwCs7nGyOvvZnhxp+Q/GadC8TP Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 08/04/2026 15:06, Hao Li wrote: > On Wed, Apr 08, 2026 at 02:04:54PM +0100, Jon Hunter wrote: >> 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 > > Hi, Jon > > Thanks for the reporting. > This first bad commit is surprising. In theory, this commit seems couldn't hurt > performance. > Could you possibly manually switch commits to verify this bad commit again, > without using git bisect? So I went back and checked out commit e47c897a29491ade20b27612fdd3107c39a07357 ("slab: add sheaves to most caches") confirmed that the problem exists there and then reverted that and confirmed that I no longer see the problem. Jon -- nvpublic