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| author | Mel Gorman <mel@csn.ul.ie> | 2009-05-05 19:37:17 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-05-06 01:37:58 +0400 |
| commit | a425a638c858fd10370b573bde81df3ba500e271 (patch) | |
| tree | 4cb1f1172467ed07999b0aff952dc12b1e61add6 /Documentation/iostats.txt | |
| parent | 99ee12973e5fd1123ed1779fb4d11ac7d381d430 (diff) | |
| download | linux-a425a638c858fd10370b573bde81df3ba500e271.tar.xz | |
Ignore madvise(MADV_WILLNEED) for hugetlbfs-backed regions
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>
Diffstat (limited to 'Documentation/iostats.txt')
0 files changed, 0 insertions, 0 deletions