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SubjectRe: [PATCH 5/6] mm/page_alloc: Free pages in a single pass during bulk free
On Fri, Feb 18, 2022 at 12:20:03PM +0800, Aaron Lu wrote:
> On Thu, Feb 17, 2022 at 09:31:13AM +0000, Mel Gorman wrote:
> > On Thu, Feb 17, 2022 at 09:53:08AM +0800, Aaron Lu wrote:
> > > > 2-socket CascadeLake (40 cores, 80 CPUs HT enabled)
> > > > 5.17.0-rc3 5.17.0-rc3
> > > > vanilla mm-highpcpopt-v2
> > > > Hmean page_fault1-processes-2 2694662.26 ( 0.00%) 2695780.35 ( 0.04%)
> > > > Hmean page_fault1-processes-5 6425819.34 ( 0.00%) 6435544.57 * 0.15%*
> > > > Hmean page_fault1-processes-8 9642169.10 ( 0.00%) 9658962.39 ( 0.17%)
> > > > Hmean page_fault1-processes-12 12167502.10 ( 0.00%) 12190163.79 ( 0.19%)
> > > > Hmean page_fault1-processes-21 15636859.03 ( 0.00%) 15612447.26 ( -0.16%)
> > > > Hmean page_fault1-processes-30 25157348.61 ( 0.00%) 25169456.65 ( 0.05%)
> > > > Hmean page_fault1-processes-48 27694013.85 ( 0.00%) 27671111.46 ( -0.08%)
> > > > Hmean page_fault1-processes-79 25928742.64 ( 0.00%) 25934202.02 ( 0.02%) <--
> > > > Hmean page_fault1-processes-110 25730869.75 ( 0.00%) 25671880.65 * -0.23%*
> > > > Hmean page_fault1-processes-141 25626992.42 ( 0.00%) 25629551.61 ( 0.01%)
> > > > Hmean page_fault1-processes-172 25611651.35 ( 0.00%) 25614927.99 ( 0.01%)
> > > > Hmean page_fault1-processes-203 25577298.75 ( 0.00%) 25583445.59 ( 0.02%)
> > > > Hmean page_fault1-processes-234 25580686.07 ( 0.00%) 25608240.71 ( 0.11%)
> > > > Hmean page_fault1-processes-265 25570215.47 ( 0.00%) 25568647.58 ( -0.01%)
> > > > Hmean page_fault1-processes-296 25549488.62 ( 0.00%) 25543935.00 ( -0.02%)
> > > > Hmean page_fault1-processes-320 25555149.05 ( 0.00%) 25575696.74 ( 0.08%)
> > > >
> > > > The differences are mostly within the noise and the difference close to
> > > > $nr_cpus is negligible.
> > >
> > > I have queued will-it-scale/page_fault1/processes/$nr_cpu on 2 4-sockets
> > > servers: CascadeLake and CooperLaker and will let you know the result
> > > once it's out.
> > >
> >
> > Thanks, 4 sockets and a later generation would be nice to cover.
> >
> > > I'm using 'https://github.com/hnaz/linux-mm master' and doing the
> > > comparison with commit c000d687ce22("mm/page_alloc: simplify how many
> > > pages are selected per pcp list during bulk free") and commit 8391e0a7e172
> > > ("mm/page_alloc: free pages in a single pass during bulk free") there.
> > >
> >
> > The baseline looks fine. It's different to what I used but the page_alloc
> > shouldn't have much impact.
> >
> > When looking at will-it-scale, please pay attention to lower CPU counts
> > as well and take account changes in standard deviation. Looking at the
>
> I'll also test nr_task=4/16/64 on the 4sockets CooperLake(nr_cpu=144) then.
>

For the record, these tests don't show any visible performance changes
on CooperLake.

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