sched: call resched_task() conditionally from new task wake up path

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- During wake up of a new task, task_new_fair() can do a resched_task()
  on the current task. Later in the code path, check_preempt_curr() also ends
  up doing the same, which can be avoided. Check if TIF_NEED_RESCHED is
  already set for the current task.

- task_new_fair() does a resched_task() on the current task unconditionally.
  This can be done only in case when child runs before the parent.

So this is a small speedup.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Bharata B Rao 2008-08-28 14:42:49 +05:30 • committed by Ingo Molnar

parent 65eb3dc609

commit aec0a5142c

1 changed files with 8 additions and 1 deletions

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kernel/sched_fair.c

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