| commit | ea20dec21f7b8ddd40b9ab307f3c7e9a2b00fb84 | |
| author | Mel Gorman <mel@csn.ul.ie> | |
| Tue, 5 May 2009 15:37:17 +0000 (5 16:37 +0100) | ||
| committer | Greg Kroah-Hartman <gregkh@suse.de> | |
| Fri, 8 May 2009 22:45:11 +0000 (8 15:45 -0700) | ||
| tree | 3479ad9a4dc7e505851ec96c2d8eee649f878bb2 | treesnapshot (tar.gz zip) |
| parent | 1fff7d359d6cc49bb9a276134bd7d90366f74110 | commitdiff |
Ignore madvise(MADV_WILLNEED) for hugetlbfs-backed regions
commit a425a638c858fd10370b573bde81df3ba500e271 upstream.
madvise(MADV_WILLNEED) forces page cache readahead on a range of memory
backed by a file. The assumption is made that the page required is
order-0 and "normal" page cache.
On hugetlbfs, this assumption is not true and order-0 pages are
allocated and inserted into the hugetlbfs page cache. This leaks
hugetlbfs page reservations and can cause BUGs to trigger related to
corrupted page tables.
This patch causes MADV_WILLNEED to be ignored for hugetlbfs-backed
regions.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
commit a425a638c858fd10370b573bde81df3ba500e271 upstream.
madvise(MADV_WILLNEED) forces page cache readahead on a range of memory
backed by a file. The assumption is made that the page required is
order-0 and "normal" page cache.
On hugetlbfs, this assumption is not true and order-0 pages are
allocated and inserted into the hugetlbfs page cache. This leaks
hugetlbfs page reservations and can cause BUGs to trigger related to
corrupted page tables.
This patch causes MADV_WILLNEED to be ignored for hugetlbfs-backed
regions.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| mm/madvise.c | diffblobblamehistory |