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vmstat: mlocked pages statistics

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Add NR_MLOCK zone page state, which provides a (conservative) count of
mlocked pages (actually, the number of mlocked pages moved off the LRU).

Reworked by lts to fit in with the modified mlock page support in the
Reclaim Scalability series.

[[email protected]: fix incorrect Mlocked field of /proc/meminfo]
[[email protected]: mlocked-pages: add event counting with statistics]
Signed-off-by: Nick Piggin <[email protected]>
Signed-off-by: Lee Schermerhorn <[email protected]>
Signed-off-by: Rik van Riel <[email protected]>
Signed-off-by: KOSAKI Motohiro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nick Piggin 2008-10-18 20:26:51 -07:00 • committed by Linus Torvalds
commit 5344b7e648
7 changed files with 65 additions and 9 deletions
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41
mm/mlock.c
View file

@ -60,6 +60,8 @@ void __clear_page_mlock(struct page *page)
return;
}
dec_zone_page_state(page, NR_MLOCK);
count_vm_event(UNEVICTABLE_PGCLEARED);
if (!isolate_lru_page(page)) {
putback_lru_page(page);
} else {
@ -69,6 +71,9 @@ void __clear_page_mlock(struct page *page)
lru_add_drain_all();
if (!isolate_lru_page(page))
putback_lru_page(page);
else if (PageUnevictable(page))
count_vm_event(UNEVICTABLE_PGSTRANDED);
}
}
@ -80,8 +85,12 @@ void mlock_vma_page(struct page *page)
{
BUG_ON(!PageLocked(page));
if (!TestSetPageMlocked(page) && !isolate_lru_page(page))
putback_lru_page(page);
if (!TestSetPageMlocked(page)) {
inc_zone_page_state(page, NR_MLOCK);
count_vm_event(UNEVICTABLE_PGMLOCKED);
if (!isolate_lru_page(page))
putback_lru_page(page);
}
}
/*
@ -106,9 +115,31 @@ static void munlock_vma_page(struct page *page)
{
BUG_ON(!PageLocked(page));
if (TestClearPageMlocked(page) && !isolate_lru_page(page)) {
try_to_munlock(page);
putback_lru_page(page);
if (TestClearPageMlocked(page)) {
dec_zone_page_state(page, NR_MLOCK);
if (!isolate_lru_page(page)) {
int ret = try_to_munlock(page);
/*
* did try_to_unlock() succeed or punt?
*/
if (ret == SWAP_SUCCESS || ret == SWAP_AGAIN)
count_vm_event(UNEVICTABLE_PGMUNLOCKED);
putback_lru_page(page);
} else {
/*
* We lost the race. let try_to_unmap() deal
* with it. At least we get the page state and
* mlock stats right. However, page is still on
* the noreclaim list. We'll fix that up when
* the page is eventually freed or we scan the
* noreclaim list.
*/
if (PageUnevictable(page))
count_vm_event(UNEVICTABLE_PGSTRANDED);
else
count_vm_event(UNEVICTABLE_PGMUNLOCKED);
}
}
}