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thp, vmstat: implement HZP_ALLOC and HZP_ALLOC_FAILED events

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hzp_alloc is incremented every time a huge zero page is successfully
	allocated. It includes allocations which where dropped due
	race with other allocation. Note, it doesn't count every map
	of the huge zero page, only its allocation.

hzp_alloc_failed is incremented if kernel fails to allocate huge zero
	page and falls back to using small pages.

Signed-off-by: Kirill A. Shutemov <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: David Rientjes <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kirill A. Shutemov 2012-12-12 13:51:09 -08:00 • committed by Linus Torvalds
commit d8a8e1f0da
4 changed files with 16 additions and 1 deletions
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2
mm/vmstat.c
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@ -801,6 +801,8 @@ const char * const vmstat_text[] = {
"thp_collapse_alloc",
"thp_collapse_alloc_failed",
"thp_split",
"thp_zero_page_alloc",
"thp_zero_page_alloc_failed",
#endif
#endif /* CONFIG_VM_EVENTS_COUNTERS */