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From: Dave Hansen <dave.hansen@intel.com>
To: Mel Gorman <mgorman@techsingularity.net>
Cc: 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>, "Tang, Feng" <feng.tang@intel.com>
Subject: Re: [PATCH 0/6 v2] Calculate pcp->high based on zone sizes and active CPUs
Date: Fri, 28 May 2021 09:17:41 -0700	[thread overview]
Message-ID: <c847e968-670a-ff6b-2f14-7fa4066955dd@intel.com> (raw)
In-Reply-To: <20210528151834.GR30378@techsingularity.net>

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.

  reply	other threads:[~2021-05-28 16:18 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 [this message]
2021-05-31 12:00           ` Feng Tang

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