This patch add pgvolatile vmstat so admin can see how many of volatile
pages are discarded by VM until now. It could be a good indicator of
patch effect during test but still not sure we need it in real practice.
Will rethink it.
Cc: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
Cc: Arun Sharma <asharma@xxxxxx>
Cc: sanjay@xxxxxxxxxx
Cc: Paul Turner <pjt@xxxxxxxxxx>
CC: David Rientjes <rientjes@xxxxxxxxxx>
Cc: John Stultz <john.stultz@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Android Kernel Team <kernel-team@xxxxxxxxxxx>
Cc: Robert Love <rlove@xxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Dave Hansen <dave@xxxxxxxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Neil Brown <neilb@xxxxxxx>
Cc: Mike Hommey <mh@xxxxxxxxxxxx>
Cc: Taras Glek <tglek@xxxxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
---
include/linux/vm_event_item.h | 2 +-
mm/vmscan.c | 1 +
mm/vmstat.c | 1 +
3 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 3d31145..f83c3d2 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -23,7 +23,7 @@
enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
FOR_ALL_ZONES(PGALLOC),
- PGFREE, PGACTIVATE, PGDEACTIVATE,
+ PGFREE, PGVOLATILE, PGACTIVATE, PGDEACTIVATE,
PGFAULT, PGMAJFAULT,
FOR_ALL_ZONES(PGREFILL),
FOR_ALL_ZONES(PGSTEAL_KSWAPD),
diff --git a/mm/vmscan.c b/mm/vmscan.c
index cfe95d3..1ec7345 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -794,6 +794,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
if (page_mapped(page) && mapping) {
switch (try_to_unmap(page, ttu_flags)) {
case SWAP_DISCARD:
+ count_vm_event(PGVOLATILE);
goto discard_page;
case SWAP_FAIL:
goto activate_locked;
diff --git a/mm/vmstat.c b/mm/vmstat.c
index c737057..9fd8ead 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -747,6 +747,7 @@ const char * const vmstat_text[] = {
TEXTS_FOR_ZONES("pgalloc")
"pgfree",
+ "pgvolatile",
"pgactivate",
"pgdeactivate",
--
1.7.9.5
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