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author | Joe Korty <joe.korty@ccur.com> | 2008-03-05 15:04:59 -0800 |
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committer | Christoph Lameter <clameter@sgi.com> | 2008-03-06 16:21:50 -0800 |
commit | 6d2144d355d2a532e5cc3fc12a6ba2a8d4ef15e4 (patch) | |
tree | 1c27eecfce86a166ca827bfbd2fe7a46888a7bc0 /Documentation/vm | |
parent | b6210386787728b84db25adc4f1eba70440a4c73 (diff) |
slab: NUMA slab allocator migration bugfix
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>
Diffstat (limited to 'Documentation/vm')
0 files changed, 0 insertions, 0 deletions