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David Howells 165b239270 [PATCH] NOMMU: make SYSV SHM nattch work correctly 
Make the SYSV SHM nattch counter work correctly by forcing multiple VMAs to
be produced to represent MAP_SHARED segments, even if they overlap exactly.

Using this test program:

	http://people.redhat.com/~dhowells/doshm.c

Run as:

	doshm sysv

I can see nattch going from one before the patch:

	# /doshm sysv
	Command: sysv
	shmid: 65536
	memory: 0xc3700000
	c0b00000-c0b04000 rw-p 00000000 00:00 0
	c0bb0000-c0bba788 r-xs 00000000 00:0b 14582157  /lib/ld-uClibc-0.9.28.so
	c3180000-c31dede4 r-xs 00000000 00:0b 14582179  /lib/libuClibc-0.9.28.so
	c3520000-c352278c rw-p 00000000 00:0b 13763417  /doshm
	c3584000-c35865e8 r-xs 00000000 00:0b 13763417  /doshm
	c3588000-c358aa00 rw-p 00008000 00:0b 14582157  /lib/ld-uClibc-0.9.28.so
	c3590000-c359b6c0 rw-p 00000000 00:00 0
	c3620000-c3640000 rwxp 00000000 00:00 0
	c3700000-c37fa000 rw-S 00000000 00:06 1411      /SYSV00000000 (deleted)
	c3700000-c37fa000 rw-S 00000000 00:06 1411      /SYSV00000000 (deleted)
	nattch 1

To two after the patch:

	# /doshm sysv
	Command: sysv
	shmid: 0
	memory: 0xc3700000
	c0bb0000-c0bba788 r-xs 00000000 00:0b 14582157  /lib/ld-uClibc-0.9.28.so
	c3180000-c31dede4 r-xs 00000000 00:0b 14582179  /lib/libuClibc-0.9.28.so
	c3320000-c3340000 rwxp 00000000 00:00 0
	c3530000-c35325e8 r-xs 00000000 00:0b 13763417  /doshm
	c3534000-c353678c rw-p 00000000 00:0b 13763417  /doshm
	c3538000-c353aa00 rw-p 00008000 00:0b 14582157  /lib/ld-uClibc-0.9.28.so
	c3590000-c359b6c0 rw-p 00000000 00:00 0
	c35a4000-c35a8000 rw-p 00000000 00:00 0
	c3700000-c37fa000 rw-S 00000000 00:06 1369      /SYSV00000000 (deleted)
	c3700000-c37fa000 rw-S 00000000 00:06 1369      /SYSV00000000 (deleted)
	nattch 2

That's +1 to nattch for each shmat() made.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-03-22 19:39:06 -07:00
..
allocpercpu.c
backing-dev.c [PATCH] nfs: fix congestion control 2007-03-16 19:25:05 -07:00
bootmem.c
bounce.c
fadvise.c
filemap.c [PATCH] dio: invalidate clean pages before dio write 2007-03-16 19:25:04 -07:00
filemap.h
filemap_xip.c [PATCH] mm: mremap correct rmap accounting 2007-01-30 08:33:32 -08:00
fremap.c
highmem.c [PATCH] Use ZVC for free_pages 2007-02-11 10:51:17 -08:00
hugetlb.c [PATCH] hugetlb: preserve hugetlb pte dirty state 2007-02-09 09:25:46 -08:00
internal.h
Kconfig [PATCH] Set CONFIG_ZONE_DMA for arches with GENERIC_ISA_DMA 2007-02-11 10:51:19 -08:00
madvise.c [PATCH] mm: fix madvise infinine loop 2007-03-16 19:25:04 -07:00
Makefile
memory.c [PATCH] Add NOPFN_REFAULT result from vm_ops->nopfn() 2007-02-12 09:48:27 -08:00
memory_hotplug.c
mempolicy.c [PATCH] Page migration: Fix vma flag checking 2007-03-05 07:57:51 -08:00
mempool.c [PATCH] Numerous fixes to kernel-doc info in source files. 2007-02-11 10:51:32 -08:00
migrate.c [PATCH] Page migration: Fix vma flag checking 2007-03-05 07:57:51 -08:00
mincore.c [PATCH] mincore: vma crossing fix 2007-02-15 09:57:03 -08:00
mlock.c
mmap.c [PATCH] Bug in MM_RB debugging 2007-03-01 14:53:38 -08:00
mmzone.c
mprotect.c
mremap.c [PATCH] mm: mremap correct rmap accounting 2007-01-30 08:33:32 -08:00
msync.c
nommu.c [PATCH] NOMMU: make SYSV SHM nattch work correctly 2007-03-22 19:39:06 -07:00
oom_kill.c [PATCH] oom fix: prevent oom from killing a process with children/sibling unkillable 2007-03-16 19:25:06 -07:00
page-writeback.c [PATCH] throttle_vm_writeout(): don't loop on GFP_NOFS and GFP_NOIO allocations 2007-03-01 14:53:38 -08:00
page_alloc.c [PATCH] Rename PG_checked to PG_owner_priv_1 2007-03-01 14:53:37 -08:00
page_io.c
pdflush.c
prio_tree.c
readahead.c [PATCH] Drop __get_zone_counts() 2007-02-11 10:51:18 -08:00
rmap.c [PATCH] adapt page_lock_anon_vma() to PREEMPT_RCU 2007-03-01 14:53:39 -08:00
shmem.c [PATCH] shmem and simple const super_operations 2007-03-05 07:57:51 -08:00
shmem_acl.c
slab.c [PATCH] kernel-doc fixes for 2.6.20-git15 (non-drivers) 2007-03-01 14:53:37 -08:00
slob.c
sparse.c
swap.c
swap_state.c
swapfile.c
thrash.c
tiny-shmem.c [PATCH] mm/{,tiny-}shmem.c cleanups 2007-03-01 14:53:35 -08:00
truncate.c [PATCH] VM: invalidate_inode_pages2_range() should not exit early 2007-03-01 14:53:39 -08:00
util.c
vmalloc.c [PATCH] Numerous fixes to kernel-doc info in source files. 2007-02-11 10:51:32 -08:00
vmscan.c [PATCH] throttle_vm_writeout(): don't loop on GFP_NOFS and GFP_NOIO allocations 2007-03-01 14:53:38 -08:00
vmstat.c [PATCH] optional ZONE_DMA: optional ZONE_DMA in the VM 2007-02-11 10:51:18 -08:00