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author | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2015-04-16 02:14:35 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-16 02:35:19 +0300 |
commit | 822fc61367f062d36c5b5a4d517e9bd2b65a741f (patch) | |
tree | 01e85731a4d8b4e4f9252d9e6e2e6a8e597d05ff /mm/swap.c | |
parent | 9fcd145717e6496d0c376acb1a5cc551a716c305 (diff) | |
download | linux-822fc61367f062d36c5b5a4d517e9bd2b65a741f.tar.xz |
mm: don't call __page_cache_release for hugetlb
__put_compound_page() calls __page_cache_release() to do some freeing
work, but it's obviously for thps, not for hugetlb. We don't care because
PageLRU is always cleared and page->mem_cgroup is always NULL for hugetlb.
But it's not correct and has potential risks, so let's make it
conditional.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Hugh Dickins <hughd@google.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/swap.c')
-rw-r--r-- | mm/swap.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/mm/swap.c b/mm/swap.c index e3a4feac9b0e..a7251a8ed532 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -31,6 +31,7 @@ #include <linux/memcontrol.h> #include <linux/gfp.h> #include <linux/uio.h> +#include <linux/hugetlb.h> #include "internal.h" @@ -75,7 +76,14 @@ static void __put_compound_page(struct page *page) { compound_page_dtor *dtor; - __page_cache_release(page); + /* + * __page_cache_release() is supposed to be called for thp, not for + * hugetlb. This is because hugetlb page does never have PageLRU set + * (it's never listed to any LRU lists) and no memcg routines should + * be called for hugetlb (it has a separate hugetlb_cgroup.) + */ + if (!PageHuge(page)) + __page_cache_release(page); dtor = get_compound_page_dtor(page); (*dtor)(page); } |