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mm: fix up the vmscan stat in vmstat 

The "pgsteal" stat is confusing because it counts both direct reclaim as
well as background reclaim.  However, we have "kswapd_steal" which also
counts background reclaim value.

This patch fixes it and also makes it match the existng "pgscan_" stats.

Test:
pgsteal_kswapd_dma32 447623
pgsteal_kswapd_normal 42272677
pgsteal_kswapd_movable 0
pgsteal_direct_dma32 2801
pgsteal_direct_normal 44353270
pgsteal_direct_movable 0

Signed-off-by: Ying Han <yinghan@google.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Mel Gorman <mel@csn.ul.ie>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>
Reviewed-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ying Han 2012-04-25 16:01:48 -07:00 committed by Linus Torvalds
parent 13d518074a
commit 904249aa68
3 changed files with 13 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/vm_event_item.h
View File

@ -26,13 +26,14 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
PGFREE, PGACTIVATE, PGDEACTIVATE, PGFREE, PGACTIVATE, PGDEACTIVATE,
PGFAULT, PGMAJFAULT, PGFAULT, PGMAJFAULT,
FOR_ALL_ZONES(PGREFILL), FOR_ALL_ZONES(PGREFILL),
FOR_ALL_ZONES(PGSTEAL), FOR_ALL_ZONES(PGSTEAL_KSWAPD),
FOR_ALL_ZONES(PGSTEAL_DIRECT),
FOR_ALL_ZONES(PGSCAN_KSWAPD), FOR_ALL_ZONES(PGSCAN_KSWAPD),
FOR_ALL_ZONES(PGSCAN_DIRECT), FOR_ALL_ZONES(PGSCAN_DIRECT),
#ifdef CONFIG_NUMA #ifdef CONFIG_NUMA
PGSCAN_ZONE_RECLAIM_FAILED, PGSCAN_ZONE_RECLAIM_FAILED,
#endif #endif
PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL, PGINODESTEAL, SLABS_SCANNED, KSWAPD_INODESTEAL,
KSWAPD_LOW_WMARK_HIT_QUICKLY, KSWAPD_HIGH_WMARK_HIT_QUICKLY, KSWAPD_LOW_WMARK_HIT_QUICKLY, KSWAPD_HIGH_WMARK_HIT_QUICKLY,
KSWAPD_SKIP_CONGESTION_WAIT, KSWAPD_SKIP_CONGESTION_WAIT,
PAGEOUTRUN, ALLOCSTALL, PGROTATED, PAGEOUTRUN, ALLOCSTALL, PGROTATED,

11
mm/vmscan.c
View File

@ -1568,9 +1568,14 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
reclaim_stat->recent_scanned[0] += nr_anon; reclaim_stat->recent_scanned[0] += nr_anon;
reclaim_stat->recent_scanned[1] += nr_file; reclaim_stat->recent_scanned[1] += nr_file;
if (current_is_kswapd()) if (global_reclaim(sc)) {
__count_vm_events(KSWAPD_STEAL, nr_reclaimed); if (current_is_kswapd())
__count_zone_vm_events(PGSTEAL, zone, nr_reclaimed); __count_zone_vm_events(PGSTEAL_KSWAPD, zone,
nr_reclaimed);
else
__count_zone_vm_events(PGSTEAL_DIRECT, zone,
nr_reclaimed);
}
putback_inactive_pages(mz, &page_list); putback_inactive_pages(mz, &page_list);

4
mm/vmstat.c
View File

@ -738,7 +738,8 @@ const char * const vmstat_text[] = {
"pgmajfault", "pgmajfault",
TEXTS_FOR_ZONES("pgrefill") TEXTS_FOR_ZONES("pgrefill")
TEXTS_FOR_ZONES("pgsteal") TEXTS_FOR_ZONES("pgsteal_kswapd")
TEXTS_FOR_ZONES("pgsteal_direct")
TEXTS_FOR_ZONES("pgscan_kswapd") TEXTS_FOR_ZONES("pgscan_kswapd")
TEXTS_FOR_ZONES("pgscan_direct") TEXTS_FOR_ZONES("pgscan_direct")
@ -747,7 +748,6 @@ const char * const vmstat_text[] = {
#endif #endif
"pginodesteal", "pginodesteal",
"slabs_scanned", "slabs_scanned",
"kswapd_steal",
"kswapd_inodesteal", "kswapd_inodesteal",
"kswapd_low_wmark_hit_quickly", "kswapd_low_wmark_hit_quickly",
"kswapd_high_wmark_hit_quickly", "kswapd_high_wmark_hit_quickly",