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authorChen, Kenneth W <kenneth.w.chen@intel.com>2006-06-23 05:03:15 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-23 10:42:48 -0400
commita43a8c39bbb493c9e93f6764b350de2e33e18e92 (patch)
treea3f0042371810ce6d076751d8e403baaa3d2630e /init
parente8f03d02080b25f53cd6bba8dc3a297803f18c01 (diff)
[PATCH] tightening hugetlb strict accounting
Current hugetlb strict accounting for shared mapping always assume mapping starts at zero file offset and reserves pages between zero and size of the file. This assumption often reserves (or lock down) a lot more pages then necessary if application maps at none zero file offset. libhugetlbfs is one example that requires proper reservation on shared mapping starts at none zero offset. This patch extends the reservation and hugetlb strict accounting to support any arbitrary pair of (offset, len), resulting a much more robust and accurate scheme. More importantly, it won't lock down any hugetlb pages outside file mapping. Signed-off-by: Ken Chen <kenneth.w.chen@intel.com> Acked-by: Adam Litke <agl@us.ibm.com> Cc: David Gibson <david@gibson.dropbear.id.au> Cc: William Lee Irwin III <wli@holomorphy.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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