]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
Ignore madvise(MADV_WILLNEED) for hugetlbfs-backed regions
authorMel Gorman <mel@csn.ul.ie>
Tue, 5 May 2009 15:37:17 +0000 (16:37 +0100)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 5 May 2009 21:37:58 +0000 (14:37 -0700)
commita425a638c858fd10370b573bde81df3ba500e271
tree4cb1f1172467ed07999b0aff952dc12b1e61add6
parent99ee12973e5fd1123ed1779fb4d11ac7d381d430
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>
mm/madvise.c