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authorMel Gorman <mel@csn.ul.ie>2009-02-11 16:34:16 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2009-02-11 12:38:09 -0800
commit17c9d12e126cb0de8d535dc1908c4819d712bc68 (patch)
treea1a9a07e2eb70e8c474d3bd040d724413bde9718 /mm/migrate.c
parent6c6f1f0f4db31a192916eaa31ec2f114fda7d5e5 (diff)
Do not account for hugetlbfs quota at mmap() time if mapping [SHM|MAP]_NORESERVE
Commit 5a6fe125950676015f5108fb71b2a67441755003 brought hugetlbfs more in line with the core VM by obeying VM_NORESERVE and not reserving hugepages for both shared and private mappings when [SHM|MAP]_NORESERVE are specified. However, it is still taking filesystem quota unconditionally. At fault time, if there are no reserves and attempt is made to allocate the page and account for filesystem quota. If either fail, the fault fails. The impact is that quota is getting accounted for twice. This patch partially reverts 5a6fe125950676015f5108fb71b2a67441755003. To help prevent this mistake happening again, it improves the documentation of hugetlb_reserve_pages() Reported-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/migrate.c')
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