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| author | Zhenhua Huang <quic_zhenhuah@quicinc.com> | 2022-09-07 16:01:13 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-10-03 14:03:03 -0700 |
| commit | 0bba9af03d55d2cc1aa7616a8b9e522ceb49d180 (patch) | |
| tree | a55d1fe90a935eadeb8720b842196b5064b8f5a5 /mm/compaction.c | |
| parent | 61768a1b37c664faf028d925e6b7825768afcc00 (diff) | |
| download | linux-0bba9af03d55d2cc1aa7616a8b9e522ceb49d180.tar.gz | |
mm/page_owner.c: remove redundant drain_all_pages
Remove an expensive and unnecessary operation as PCP pages are safely skipped when reading page owner.PCP pages can be skipped because PAGE_EXT_OWNER_ALLOCATED is cleared. With draining PCP pages, these pages are moved to buddy list so they can be identified as buddy pages and skipped quickly. Although it improved efficiency of PFN walker, the drain is guaranteed expensive that is unlikely to be offset by a slight increase in efficiency when skipping free pages. PAGE_EXT_OWNER_ALLOCATED is cleared in the page owner reset path below: free_unref_page -> free_unref_page_prepare -> free_pcp_prepare -> free_pages_prepare which do page owner reset -> free_unref_page_commit which add pages into pcp list Link: https://lkml.kernel.org/r/1662704326-15899-1-git-send-email-quic_zhenhuah@quicinc.com Link: https://lkml.kernel.org/r/1662633204-10044-1-git-send-email-quic_zhenhuah@quicinc.com Link: https://lkml.kernel.org/r/1662537673-9392-1-git-send-email-quic_zhenhuah@quicinc.com Signed-off-by: Zhenhua Huang <quic_zhenhuah@quicinc.com> Acked-by: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/compaction.c')
0 files changed, 0 insertions, 0 deletions