Messages in this thread | | | Subject | Re: [PATCH v4 1/4] mm/pageblock: mitigation cmpxchg false sharing in pageblock flags | From | Alex Shi <> | Date | Thu, 3 Sep 2020 16:40:40 +0800 |
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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
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