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| author | Hugh Dickins <hughd@google.com> | 2012-03-10 01:37:32 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-03-10 03:32:20 +0400 |
| commit | be22aece684f5a700e6247b9861c3759d5798a3c (patch) | |
| tree | 07d423a2cdb16140e8704a69788f8b9bd5ddbe13 | |
| parent | a7f4255f906f60f72e00aad2fb000939449ff32e (diff) | |
| download | linux-be22aece684f5a700e6247b9861c3759d5798a3c.tar.xz | |
memcg: revert fix to mapcount check for this release
Respectfully revert commit e6ca7b89dc76 "memcg: fix mapcount check
in move charge code for anonymous page" for the 3.3 release, so that
it behaves exactly like releases 2.6.35 through 3.2 in this respect.
Horiguchi-san's commit is correct in itself, 1 makes much more sense
than 2 in that check; but it does not go far enough - swapcount
should be considered too - if we really want such a check at all.
We appear to have reached agreement now, and expect that 3.4 will
remove the mapcount check, but had better not make 3.3 different.
Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/memcontrol.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 5585dc3d3646..d0e57a3cda18 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5075,7 +5075,7 @@ static struct page *mc_handle_present_pte(struct vm_area_struct *vma, return NULL; if (PageAnon(page)) { /* we don't move shared anon */ - if (!move_anon() || page_mapcount(page) > 1) + if (!move_anon() || page_mapcount(page) > 2) return NULL; } else if (!move_file()) /* we ignore mapcount for file pages */ |