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Hugh Dickins 4e6a510a74 [PATCH] mm: hugepage accounting fix 2.6.15's hugepage faulting introduced huge_pages_needed accounting into hugetlbfs: to count how many pages are already in cache, for spot check on how far a new mapping may be allowed to extend the file. But it's muddled: each hugepage found covers HPAGE_SIZE, not PAGE_SIZE. Once pages were already in cache, it would overshoot, wrap its hugepages count backwards, and so fail a harmless repeat mapping with -ENOMEM. Fixes the problem found by Don Dupuis. Signed-off-by: Hugh Dickins <hugh@veritas.com> Acked-By: Adam Litke <agl@us.ibm.com> Acked-by: William Irwin <wli@holomorphy.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>	2006-02-01 08:53:15 -08:00
..
Makefile	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
inode.c	[PATCH] mm: hugepage accounting fix	2006-02-01 08:53:15 -08:00

Hugh Dickins 4e6a510a74 [PATCH] mm: hugepage accounting fix

2.6.15's hugepage faulting introduced huge_pages_needed accounting into
hugetlbfs: to count how many pages are already in cache, for spot check on
how far a new mapping may be allowed to extend the file.  But it's muddled:
each hugepage found covers HPAGE_SIZE, not PAGE_SIZE.  Once pages were
already in cache, it would overshoot, wrap its hugepages count backwards,
and so fail a harmless repeat mapping with -ENOMEM.  Fixes the problem
found by Don Dupuis.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Acked-By: Adam Litke <agl@us.ibm.com>
Acked-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2006-02-01 08:53:15 -08:00

Makefile

Linux-2.6.12-rc2

2005-04-16 15:20:36 -07:00

inode.c

[PATCH] mm: hugepage accounting fix

2006-02-01 08:53:15 -08:00