From: Alex Shi <alex.shi@linux.alibaba.com>
To: Mel Gorman <mgorman@techsingularity.net>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>,
David Hildenbrand <david@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Vlastimil Babka <vbabka@suse.cz>,
Alexander Duyck <alexander.duyck@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 1/4] mm/pageblock: mitigation cmpxchg false sharing in pageblock flags
Date: Thu, 3 Sep 2020 16:40:40 +0800 [thread overview]
Message-ID: <7813624a-d8af-f09f-d8c3-0d2a01fe5dd3@linux.alibaba.com> (raw)
In-Reply-To: <8275cc70-fd35-25c8-36d4-525a10f05e41@linux.alibaba.com>
在 2020/9/3 下午4:32, Alex Shi 写道:
>>
> I have run thpscale with 'always' defrag setting of THP. The Amean stddev is much
> larger than a very little average run time reducing.
>
> But the left patch 4 could show the cmpxchg retry reduce from thousands to hundreds
> or less.
>
> Subject: [PATCH v4 4/4] add cmpxchg tracing
It's a typical result with the patchset:
Performance counter stats for './run-mmtests.sh -c configs/config-workload-thpscale pageblock-c':
9,564 compaction:mm_compaction_isolate_migratepages
6,430 compaction:mm_compaction_isolate_freepages
5,287 compaction:mm_compaction_migratepages
45,299 compaction:mm_compaction_begin
45,299 compaction:mm_compaction_end
30,557 compaction:mm_compaction_try_to_compact_pages
95,540 compaction:mm_compaction_finished
149,379 compaction:mm_compaction_suitable
0 compaction:mm_compaction_deferred
0 compaction:mm_compaction_defer_compaction
3,949 compaction:mm_compaction_defer_reset
0 compaction:mm_compaction_kcompactd_sleep
0 compaction:mm_compaction_wakeup_kcompactd
0 compaction:mm_compaction_kcompactd_wake
68 pageblock:hit_cmpxchg
113.570974583 seconds time elapsed
14.664451000 seconds user
96.847116000 seconds sys
It's 5.9-rc2 base kernel result:
Performance counter stats for './run-mmtests.sh -c configs/config-workload-thpscale rc2-e':
15,920 compaction:mm_compaction_isolate_migratepages
20,523 compaction:mm_compaction_isolate_freepages
9,752 compaction:mm_compaction_migratepages
27,773 compaction:mm_compaction_begin
27,773 compaction:mm_compaction_end
16,391 compaction:mm_compaction_try_to_compact_pages
62,809 compaction:mm_compaction_finished
69,821 compaction:mm_compaction_suitable
0 compaction:mm_compaction_deferred
0 compaction:mm_compaction_defer_compaction
7,875 compaction:mm_compaction_defer_reset
0 compaction:mm_compaction_kcompactd_sleep
0 compaction:mm_compaction_wakeup_kcompactd
0 compaction:mm_compaction_kcompactd_wake
1,208 pageblock:hit_cmpxchg
116.440414591 seconds time elapsed
15.326913000 seconds user
103.752758000 seconds sys
next prev parent reply other threads:[~2020-09-03 8:41 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-03 7:01 Alex Shi
2020-09-03 7:01 ` [PATCH v4 2/4] mm/pageblock: remove false sharing in pageblock_flags Alex Shi
2020-09-03 7:01 ` [PATCH v4 3/4] mm/pageblock: work around multiple arch's cmpxchg support issue Alex Shi
2020-09-03 7:29 ` Max Filippov
2020-09-03 8:50 ` Alex Shi
2020-09-10 5:51 ` Christoph Hellwig
2020-09-03 7:24 ` [PATCH v4 1/4] mm/pageblock: mitigation cmpxchg false sharing in pageblock flags Mel Gorman
2020-09-03 8:32 ` Alex Shi
2020-09-03 8:40 ` Alex Shi [this message]
2020-09-03 9:00 ` Vlastimil Babka
2020-09-03 9:31 ` Mel Gorman
2020-09-03 8:19 ` David Hildenbrand
2020-09-03 9:14 ` Alex Shi
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