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author | Ken Chen <kenchen@google.com> | 2008-12-07 21:47:37 -0500 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-12-08 07:52:44 -0500 |
commit | 5436499e6098759c2340f8b906ea52f993dc4efb (patch) | |
tree | 5af189c8d0d8bf5bc6261a427c371bd4d8ba7474 /Documentation/preempt-locking.txt | |
parent | 4d117c5c6b00254e51c61ff5b506ccaba21a5a03 (diff) |
sched: fix sd_parent_degenerate on non-numa smp machine
Impact: optimize the sched domains tree some more
The addition of SD_SERIALIZE flag added to SD_NODE_INIT prevented top level
dummy numa sched_domain to be properly degenerated on non-numa smp machine.
The reason is that in sd_parent_degenerate(), it found that the child and
parent does not have comon sched_domain flags due to SD_SERIALIZE. However,
for non-numa smp box, the top level is a dummy with a single sched_group.
Filter out SD_SERIALIZE if it is on non-numa machine to properly degenerate
top level node sched_domain. this will cut back some of the sd domain walk
in the load balancer code.
Signed-off-by: Ken Chen <kenchen@google.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation/preempt-locking.txt')
0 files changed, 0 insertions, 0 deletions