From: Aaron Lu <aaron.lu@intel.com>
To: Mel Gorman <mgorman@techsingularity.net>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Vlastimil Babka <vbabka@suse.cz>,
Michal Hocko <mhocko@kernel.org>,
Jesper Dangaard Brouer <brouer@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>
Subject: Re: [PATCH 5/6] mm/page_alloc: Free pages in a single pass during bulk free
Date: Mon, 21 Feb 2022 21:38:22 +0800 [thread overview]
Message-ID: <YhOVzktqtWIJFjiJ@ziqianlu-nuc9qn> (raw)
In-Reply-To: <Yg8ec9MLblOkHTY9@ziqianlu-nuc9qn>
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.
next prev parent reply other threads:[~2022-02-21 13:38 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-17 0:22 [PATCH v2 0/6] Follow-up on high-order PCP caching Mel Gorman
2022-02-17 0:22 ` [PATCH 1/6] mm/page_alloc: Fetch the correct pcp buddy during bulk free Mel Gorman
2022-02-17 1:43 ` Aaron Lu
2022-02-17 0:22 ` [PATCH 2/6] mm/page_alloc: Track range of active PCP lists " Mel Gorman
2022-02-17 9:41 ` Vlastimil Babka
2022-02-17 0:22 ` [PATCH 3/6] mm/page_alloc: Simplify how many pages are selected per pcp list " Mel Gorman
2022-02-17 0:22 ` [PATCH 4/6] mm/page_alloc: Drain the requested list first " Mel Gorman
2022-02-17 9:42 ` Vlastimil Babka
2022-02-17 0:22 ` [PATCH 5/6] mm/page_alloc: Free pages in a single pass " Mel Gorman
2022-02-17 1:53 ` Aaron Lu
2022-02-17 8:49 ` Aaron Lu
2022-02-17 9:31 ` Mel Gorman
2022-02-18 4:20 ` Aaron Lu
2022-02-18 9:20 ` Mel Gorman
2022-02-21 13:38 ` Aaron Lu [this message]
2022-02-23 11:30 ` Aaron Lu
2022-02-23 13:05 ` Mel Gorman
2022-02-24 1:34 ` Lu, Aaron
2022-02-18 6:07 ` Aaron Lu
2022-02-18 9:47 ` Mel Gorman
2022-02-18 12:13 ` Aaron Lu
2022-02-17 0:22 ` [PATCH 6/6] mm/page_alloc: Limit number of high-order pages on PCP " Mel Gorman
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