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| author |   Paul Jackson <pj@sgi.com> | 2006-01-14 13:21:06 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-14 18:27:10 -0800 |
| commit | 505970b96e3b7d22177c38e03435a68376628e7a (patch) | |
| tree | 5508317e391961355bf3d946a6aac05bb21569eb /scripts | |
| parent | [PATCH] s390: fix blk_queue_ordered call in dasd.c fixup (diff) | |
| download | linux-dev-505970b96e3b7d22177c38e03435a68376628e7a.tar.xz linux-dev-505970b96e3b7d22177c38e03435a68376628e7a.zip | |
[PATCH] cpuset oom lock fix
The problem, reported in:
http://bugzilla.kernel.org/show_bug.cgi?id=5859
and by various other email messages and lkml posts is that the cpuset hook
in the oom (out of memory) code can try to take a cpuset semaphore while
holding the tasklist_lock (a spinlock).
One must not sleep while holding a spinlock.
The fix seems easy enough - move the cpuset semaphore region outside the
tasklist_lock region.
This required a few lines of mechanism to implement. The oom code where
the locking needs to be changed does not have access to the cpuset locks,
which are internal to kernel/cpuset.c only. So I provided a couple more
cpuset interface routines, available to the rest of the kernel, which
simple take and drop the lock needed here (cpusets callback_sem).
Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'scripts')
0 files changed, 0 insertions, 0 deletions