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| author | Hugh Dickins <hugh.dickins@tiscali.co.uk> | 2009-12-14 17:58:58 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-15 08:53:17 -0800 |
| commit | 53f79acb6ecb648afd63e0f13deba167f1a934df (patch) | |
| tree | 48d9b998fa45c4fe510447d17cdc050f31be5e23 /mm/mlock.c | |
| parent | 3ca7b3c5b64d35fe02c35b5d44c2c58b49499fee (diff) | |
| download | lwn-53f79acb6ecb648afd63e0f13deba167f1a934df.tar.gz lwn-53f79acb6ecb648afd63e0f13deba167f1a934df.zip | |
mm: mlocking in try_to_unmap_one
There's contorted mlock/munlock handling in try_to_unmap_anon() and
try_to_unmap_file(), which we'd prefer not to repeat for KSM swapping.
Simplify it by moving it all down into try_to_unmap_one().
One thing is then lost, try_to_munlock()'s distinction between when no vma
holds the page mlocked, and when a vma does mlock it, but we could not get
mmap_sem to set the page flag. But its only caller takes no interest in
that distinction (and is better testing SWAP_MLOCK anyway), so let's keep
the code simple and return SWAP_AGAIN for both cases.
try_to_unmap_file()'s TTU_MUNLOCK nonlinear handling was particularly
amusing: once unravelled, it turns out to have been choosing between two
different ways of doing the same nothing. Ah, no, one way was actually
returning SWAP_FAIL when it meant to return SWAP_SUCCESS.
[kosaki.motohiro@jp.fujitsu.com: comment adding to mlocking in try_to_unmap_one]
[akpm@linux-foundation.org: remove test of MLOCK_PAGES]
Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: Izik Eidus <ieidus@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mlock.c')
| -rw-r--r-- | mm/mlock.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/mlock.c b/mm/mlock.c index bd6f0e466f6c..48691fb08514 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -117,7 +117,7 @@ static void munlock_vma_page(struct page *page) /* * did try_to_unlock() succeed or punt? */ - if (ret == SWAP_SUCCESS || ret == SWAP_AGAIN) + if (ret != SWAP_MLOCK) count_vm_event(UNEVICTABLE_PGMUNLOCKED); putback_lru_page(page); |