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a=WeWmnZmh0fydH62SvGsd2A==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=kj9zAlcOel0A:10 a=wP3pNCr1ah4A:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=rtf5ve0gEGRHhCDhAaoA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMjA1MDEwNCBTYWx0ZWRfX1XdrlA6lJzOz iJiuWwmkp+L/z1INQYA756X4bMML8agiK2ft40l4u+ZhAOyOGaeZk6hWh9ck68OOOYncoNT5RvQ jbfbKR+Ibnh7eELMwXA2W0F8D10CzI5sfmY04o0GAykxCOw9YgEmDxduW3Gl90YMpl/TTalNF1L zZO195aViCfQmRRG0CHfs4isO+z70MWa3SXre2ldDiEdkw0nzBuEnGaVLblOPke5mGr8sQU4Com dBaFjiMqkCImGQ9P8Gg43qIfztPXKPWwOPO2idbZWsgywfkj46foDWel9EjRbcmjDratfP8uN8r PLI/aO4L5W/qNVTMMVkIE6vYm6MQ85OMCl8VAEd4tl1LGKm8NGP2b9wxGeJmtxWsEaCdjJ63BHo 9AOGRFggwyFY4n30ShdFK7PXc+mgAQ== X-Proofpoint-ORIG-GUID: -rvlsgLV9cNQEvUCbBPodOjr_9Fjn8uX On Fri, Dec 05, 2025 at 12:11:23PM +0000, Lorenzo Stoakes wrote: > On Fri, Dec 05, 2025 at 09:41:37AM +0800, kernel test robot wrote: > > > > > > Hello, > > > > kernel test robot noticed a 34.1% regression of stress-ng.msg.ops_per_sec on: > > > > > > commit: 2b6a3f061f11372af79b862d6184d43193ae927f ("mm: declare VMA flags by bit") > > This is strange, as this _should_ have no actual impact on anything. > > However, it seems that <= 32-bit flags being declared as de-facto unsigned int > is the delta here, and by declaring everything as an unsigned long via BIT() we > have inadvertantly undone this optimisation. > > We can resolve this by having two types of INIT_VM_FLAG() macro - one for 32-bit > flags and one for 64-bit flags and using each as appropriate. > > I will send a patch shortly. > > Cheers, Lorenzo OK, having said that, I've now been able to restore original performance to baseline just by making the result signed rather than unsigned :/ I am digging in to why on earth this is the case, will see if I can figure out which flag and then which bit of code is somehow relying on this. BTW I notice reduced system time before patch/with fixup, but the actual bogo ops/s values are... worse before + after the patch cited as a regression here? All very odd: stress-ng: metrc: [1662] stressor bogo ops real time usr time sys time bogo ops/s bogo ops/s CPU used per RSS Max stress-ng: metrc: [1662] (secs) (secs) (secs) (real time) (usr+sys time) instance (%) (KB) (before patch) stress-ng: metrc: [1217] msg 906205725 60.00 136.42 560.81 15103193.43 1299711.65 18.74 2124 stress-ng: metrc: [1375] msg 901766456 60.00 134.85 552.39 15028736.07 1312159.76 18.47 2128 (after patch) stress-ng: metrc: [776] msg 1186639996 60.01 166.74 615.22 19775640.54 1517517.09 21.02 2144 stress-ng: metrc: [942] msg 1191427646 60.00 168.62 621.92 19855980.65 1507098.28 21.25 2120 (after fixup) stress-ng: metrc: [771] msg 906964106 60.02 135.62 555.29 15111666.71 1312719.21 18.57 2120 stress-ng: metrc: [934] msg 904987762 60.00 135.16 555.69 15082486.49 1309953.15 18.57 2136 Cheers, Lorenzo