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thp, vmstats: count deferred split events

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Count how many times we put a THP in split queue.  Currently, it happens
on partial unmap of a THP.

Rapidly growing value can indicate that an application behaves
unfriendly wrt THP: often fault in huge page and then unmap part of it.
This leads to unnecessary memory fragmentation and the application may
require tuning.

The event also can help with debugging kernel [mis-]behaviour.

Signed-off-by: Kirill A. Shutemov <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kirill A. Shutemov 2016-03-17 14:18:45 -07:00 • committed by Linus Torvalds
commit f9719a03de
4 changed files with 8 additions and 0 deletions
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1
mm/vmstat.c
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@ -848,6 +848,7 @@ const char * const vmstat_text[] = {
"thp_collapse_alloc_failed",
"thp_split_page",
"thp_split_page_failed",
"thp_deferred_split_page",
"thp_split_pmd",
"thp_zero_page_alloc",
"thp_zero_page_alloc_failed",