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author | Manfred Spraul <manfred@colorfullife.com> | 2014-12-13 00:58:14 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-13 20:42:52 (GMT) |
commit | e843e7d2c88b7db107a86bd2c7145dc715c058f4 (patch) | |
tree | 01557305cc1446467c9e70ba287f9b0360c9e1ce /Documentation/sysctl | |
parent | 2e094abfd1f29a08a60523b42d4508281b8dee0e (diff) | |
download | linux-e843e7d2c88b7db107a86bd2c7145dc715c058f4.tar.xz |
ipc/sem.c: increase SEMMSL, SEMMNI, SEMOPM
a)
SysV can be abused to allocate locked kernel memory. For most systems, a
small limit doesn't make sense, see the discussion with regards to SHMMAX.
Therefore: Increase the sysv sem limits so that all known applications
will work with these defaults.
b)
With regards to the maximum supported:
Some of the specified hard limits are not correct anymore, therefore the
patch updates the documentation.
- SEMMNI must stay below IPCMNI, which is 32768.
As for SHMMAX: Stay a bit below this limit.
- SEMMSL was limited to 8k, to ensure that the kmalloc for the kernel array
was limited to 16 kB (order=2)
This doesn't apply anymore:
- the allocation size isn't sizeof(short)*nsems anymore.
- ipc_alloc falls back to vmalloc
- SEMOPM should stay below 1000, to limit the kmalloc in semtimedop() to an
order=1 allocation.
Therefore: Leave it at 500 (order=0 allocation).
Note:
If an administrator must limit the memory allocations, then he can set the
values as necessary.
Or he can disable sysv entirely (as e.g. done by Android).
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Acked-by: Rafael Aquini <aquini@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/sysctl')
0 files changed, 0 insertions, 0 deletions