sched: Nominate a power-efficient ilb in select_nohz_balancer()

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The CPU that first goes idle becomes the idle-load-balancer and remains
that until either it picks up a task or till all the CPUs of the system
goes idle.

Optimize this further to allow it to relinquish it's post
once all it's siblings in the power-aware sched_domain go idle, thereby
allowing the whole package-core to go idle. While relinquising the post,
nominate another an idle-load balancer from a semi-idle core/package.

Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20090414045535.7645.31641.stgit@sofia.in.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Gautham R Shenoy 2009-04-14 10:25:35 +05:30 • committed by Ingo Molnar

parent f711f6090a

commit e790fb0ba6

1 changed files with 17 additions and 1 deletions

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kernel/sched.c

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