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ksm: fix mlockfreed to munlocked

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When KSM merges an mlocked page, it has been forgetting to munlock it:
that's been left to free_page_mlock(), which reports it in /proc/vmstat as
unevictable_pgs_mlockfreed instead of unevictable_pgs_munlocked (and
whinges "Page flag mlocked set for process" in mmotm, whereas mainline is
silently forgiving).  Call munlock_vma_page() to fix that.

Signed-off-by: Hugh Dickins <[email protected]>
Cc: Izik Eidus <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Chris Wright <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hugh Dickins 2009-12-14 17:59:22 -08:00 • committed by Linus Torvalds
commit 73848b4684
3 changed files with 8 additions and 3 deletions
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4
mm/ksm.c
View file

@ -34,6 +34,7 @@
#include <linux/ksm.h>
#include <asm/tlbflush.h>
#include "internal.h"
/*
* A few notes about the KSM scanning process,
@ -762,6 +763,9 @@ static int try_to_merge_one_page(struct vm_area_struct *vma,
pages_identical(page, kpage))
err = replace_page(vma, page, kpage, orig_pte);
if ((vma->vm_flags & VM_LOCKED) && !err)
munlock_vma_page(page);
unlock_page(page);
out:
return err;