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27 March 2024, 02:37:15 UTC
Revision 90d8b7e6129e8f4e5b3bc1a2cfbe585372ce8646 authored by Adam Litke on 15 November 2007, 00:59:42 UTC, committed by Linus Torvalds on 15 November 2007, 02:45:40 UTC 
hugetlb: enforce quotas during reservation for shared mappings
 
When a MAP_SHARED mmap of a hugetlbfs file succeeds, huge pages are reserved
to guarantee no problems will occur later when instantiating pages.  If quotas
are in force, page instantiation could fail due to a race with another process
or an oversized (but approved) shared mapping.

To prevent these scenarios, debit the quota for the full reservation amount up
front and credit the unused quota when the reservation is released.

Signed-off-by: Adam Litke <agl@us.ibm.com>
Cc: Ken Chen <kenchen@google.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: David Gibson <hermes@gibson.dropbear.id.au>
Cc: William Lee Irwin III <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 9a119c0
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Tip revision: 90d8b7e6129e8f4e5b3bc1a2cfbe585372ce8646 authored by Adam Litke on 15 November 2007, 00:59:42 UTC
hugetlb: enforce quotas during reservation for shared mappings
Tip revision: 90d8b7e
.gitignore 
#
# NOTE! Don't add files that are generated in specific
# subdirectories here. Add them in the ".gitignore" file
# in that subdirectory instead.
#
# Normal rules
#
.*
*.o
*.o.*
*.a
*.s
*.ko
*.so
*.so.dbg
*.mod.c
*.i
*.lst
*.symtypes

#
# Top-level generic files
#
tags
TAGS
vmlinux*
!vmlinux.lds.S
System.map
Module.symvers
!.gitignore

#
# Generated include files
#
include/asm
include/asm-*/asm-offsets.h
include/config
include/linux/autoconf.h
include/linux/compile.h
include/linux/version.h
include/linux/utsrelease.h

# stgit generated dirs
patches-*

# quilt's files
patches
series

# cscope files
cscope.*

*.orig
*.rej
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