https://github.com/torvalds/linux
Revision 6d2144d355d2a532e5cc3fc12a6ba2a8d4ef15e4 authored by Joe Korty on 05 March 2008, 23:04:59 UTC, committed by Christoph Lameter on 07 March 2008, 00:21:50 UTC
NUMA slab allocator cpu migration bugfix

The NUMA slab allocator (specifically, cache_alloc_refill)
is not refreshing its local copies of what cpu and what
numa node it is on, when it drops and reacquires the irq
block that it inherited from its caller.  As a result
those values become invalid if an attempt to migrate the
process to another numa node occured while the irq block
had been dropped.

The solution is to make cache_alloc_refill reload these
variables whenever it drops and reacquires the irq block.

The error is very difficult to hit.  When it does occur,
one gets the following oops + stack traceback bits in
check_spinlock_acquired:

	kernel BUG at mm/slab.c:2417
	cache_alloc_refill+0xe6
	kmem_cache_alloc+0xd0
	...

This patch was developed against 2.6.23, ported to and
compiled-tested only against 2.6.25-rc4.

Signed-off-by: Joe Korty <joe.korty@ccur.com>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
1 parent b621038
History
Tip revision: 6d2144d355d2a532e5cc3fc12a6ba2a8d4ef15e4 authored by Joe Korty on 05 March 2008, 23:04:59 UTC
slab: NUMA slab allocator migration bugfix
Tip revision: 6d2144d
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