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 DsjKXiMh 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this suffices to rule this one out... I will try to get a > > > functional and reliable performance environment locally so I can properly > > > address this and then we can try something else. > > > > > > Thanks! > > > Lorenzo > > > > > > > OK Oliver, could you try the below patch? I have got aim9.brk up and > > running locally and for me this seems to address the issue. > > > > This is against Andrew's tree [0] in the mm-unstable branch. It should > > hopefully apply cleanly to -next also. > > I found the patch still be able to applied to cacded5e42 cleanly, so below data > still based on this applyment. > > $ git log --oneline 9cecc5dc893886 > 9cecc5dc893886 mm: add expand-only VMA merge mode and optimise do_brk_flags() > cacded5e42b960 mm: avoid using vma_merge() for new VMAs > fc21959f74bc11 mm: abstract vma_expand() to use vma_merge_struct > ... > > again, if some patches in mm-unstable or -next have some impacts, please let me > know then I can re-apply the patch and do the tests again. thanks > > > by this patch, we do see performance recovery but not fully. > > e.g. for > model: Granite Rapids > nr_node: 1 > nr_cpu: 240 > memory: 192G > > we got better score from the patch than cacded5e42b960, but still 2.0% > regression than fc21959f74bc11 (the parent of cacded5e42b960) Thanks for this. As far as I'm concerned this puts us into noise territory, so we'll go with this as the solution! A side-note, the brk2 test from the will-it-scale suite, written explicitly to be more real-world representative, sees an actual performance _improvement_ here (though small). So overall I'm comfortable with this, we can revisit if anybody raises any objection! The benefit in de-duplicating code is very significant. Thanks for all your help, hugely appreciated! Cheers, Lorenzo [snip]