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| author | Mel Gorman <mel@csn.ul.ie> | 2009-05-05 16:37:17 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-05-08 15:45:11 -0700 |
| commit | ea20dec21f7b8ddd40b9ab307f3c7e9a2b00fb84 (patch) | |
| tree | 3479ad9a4dc7e505851ec96c2d8eee649f878bb2 /mm/mmap.c | |
| parent | 1fff7d359d6cc49bb9a276134bd7d90366f74110 (diff) | |
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>
Diffstat (limited to 'mm/mmap.c')
0 files changed, 0 insertions, 0 deletions