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| author |   David Rientjes <rientjes@google.com> | 2017-02-22 15:44:50 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-22 16:41:29 -0800 |
| commit | 7f354a548d1cb6bb01b6ee74aee9264aa152f1ec (patch) | |
| tree | 37036eef9c0d3c708c2fcacebacaa138a884a68e /include/linux/vm_event_item.h | |
| parent | mm/mmzone.c: swap likely to unlikely as code logic is different for next_zones_zonelist() (diff) | |
| download | linux-dev-7f354a548d1cb6bb01b6ee74aee9264aa152f1ec.tar.xz linux-dev-7f354a548d1cb6bb01b6ee74aee9264aa152f1ec.zip | |
mm, compaction: add vmstats for kcompactd work
A "compact_daemon_wake" vmstat exists that represents the number of
times kcompactd has woken up. This doesn't represent how much work it
actually did, though.
It's useful to understand how much compaction work is being done by
kcompactd versus other methods such as direct compaction and explicitly
triggered per-node (or system) compaction.
This adds two new vmstats: "compact_daemon_migrate_scanned" and
"compact_daemon_free_scanned" to represent the number of pages kcompactd
has scanned as part of its migration scanner and freeing scanner,
respectively.
These values are still accounted for in the general
"compact_migrate_scanned" and "compact_free_scanned" for compatibility.
It could be argued that explicitly triggered compaction could also be
tracked separately, and that could be added if others find it useful.
Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1612071749390.69852@chino.kir.corp.google.com
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/vm_event_item.h')
| -rw-r--r-- | include/linux/vm_event_item.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h index 4d6ec58a8d45..6aa1b6cb5828 100644 --- a/include/linux/vm_event_item.h +++ b/include/linux/vm_event_item.h @@ -56,6 +56,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, COMPACTISOLATED, COMPACTSTALL, COMPACTFAIL, COMPACTSUCCESS, KCOMPACTD_WAKE, + KCOMPACTD_MIGRATE_SCANNED, KCOMPACTD_FREE_SCANNED, #endif #ifdef CONFIG_HUGETLB_PAGE HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL, |