From: Feng Tang <feng.tang@intel.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Mel Gorman <mgorman@techsingularity.net>,
Andrew Morton <akpm@linux-foundation.org>,
Hillf Danton <hdanton@sina.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Vlastimil Babka <vbabka@suse.cz>,
Michal Hocko <mhocko@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>
Subject: Re: [PATCH 0/6 v2] Calculate pcp->high based on zone sizes and active CPUs
Date: Mon, 31 May 2021 20:00:15 +0800 [thread overview]
Message-ID: <20210531120015.GA89301@shbuild999.sh.intel.com> (raw)
In-Reply-To: <c847e968-670a-ff6b-2f14-7fa4066955dd@intel.com>
On Fri, May 28, 2021 at 09:17:41AM -0700, Dave Hansen wrote:
> On 5/28/21 8:18 AM, Mel Gorman wrote:
> >> BTW, to do some of this testing, Feng was doing a plain old kernel
> >> build. On the one system where this got run, he noted a ~2% regression
> >> in build times. Nothing major, but you might want to be on the lookout
> >> in case 0day or the other test harnesses find something similar once
> >> this series gets to them.
> >>
> > What type of system was it?
> >
> > I noticed minor differences for some thread counts on kernel compilations
> > but for CascadeLake at least, it was mostly neutral. Below is an old test
> > result based on a previous revision.
>
> It's a Cascade Lake as well. But, I never trust hardware at a hardware
> company. These could be preproduction CPUs or BIOS or both, or have
> some bonkers configuration knob flipped.
>
> It's also got a bunch of PMEM plugged and onlined, including the
> _possibility_ of kernel data structures ended up on PMEM. They *mostly*
> don't end up there, but it does happen on occasion.
>
> Anyway, I'll see if we can do some more runs with your latest version.
> It looks like it's been picked up for -mm so 0day should be pounding on
> it soon enough.
Yes, usually 0day has more benchmark test covering -mm tree.
As for the kbuild test run for v2, after more runs, the previous 2%
longer kbuild time turns to 1% shorter time, seems to be in normal
deviation range.
Also I checked Mel's v3 branch which has the fix for cpuless node,
the pcp 'high' looks normal on PMEM node:
pagesets
cpu: 0
count: 67
high: 724
batch: 63
vm stats threshold: 125
Thanks,
Feng
prev parent reply other threads:[~2021-05-31 12:00 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-25 8:01 [PATCH 0/6 v2] Calculate pcp->high based on zone sizes and active CPUs Mel Gorman
2021-05-25 8:01 ` [PATCH 1/6] mm/page_alloc: Delete vm.percpu_pagelist_fraction Mel Gorman
2021-05-26 17:41 ` Vlastimil Babka
2021-05-25 8:01 ` [PATCH 2/6] mm/page_alloc: Disassociate the pcp->high from pcp->batch Mel Gorman
2021-05-26 18:14 ` Vlastimil Babka
2021-05-27 10:52 ` Mel Gorman
2021-05-28 10:27 ` Vlastimil Babka
2021-05-25 8:01 ` [PATCH 3/6] mm/page_alloc: Adjust pcp->high after CPU hotplug events Mel Gorman
2021-05-28 11:08 ` Vlastimil Babka
2021-05-25 8:01 ` [PATCH 4/6] mm/page_alloc: Scale the number of pages that are batch freed Mel Gorman
2021-05-28 11:19 ` Vlastimil Babka
2021-05-25 8:01 ` [PATCH 5/6] mm/page_alloc: Limit the number of pages on PCP lists when reclaim is active Mel Gorman
2021-05-28 11:43 ` Vlastimil Babka
2021-05-25 8:01 ` [PATCH 6/6] mm/page_alloc: Introduce vm.percpu_pagelist_high_fraction Mel Gorman
2021-05-28 11:59 ` Vlastimil Babka
2021-05-28 12:53 ` Mel Gorman
2021-05-28 14:38 ` Vlastimil Babka
2021-05-27 19:36 ` [PATCH 0/6 v2] Calculate pcp->high based on zone sizes and active CPUs Dave Hansen
2021-05-28 8:55 ` Mel Gorman
2021-05-28 9:03 ` David Hildenbrand
2021-05-28 9:08 ` David Hildenbrand
2021-05-28 9:49 ` Mel Gorman
2021-05-28 9:52 ` David Hildenbrand
2021-05-28 10:09 ` Mel Gorman
2021-05-28 10:21 ` David Hildenbrand
2021-05-28 12:12 ` Vlastimil Babka
2021-05-28 12:37 ` Mel Gorman
2021-05-28 14:39 ` Dave Hansen
2021-05-28 15:18 ` Mel Gorman
2021-05-28 16:17 ` Dave Hansen
2021-05-31 12:00 ` Feng Tang [this message]
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