From: Bharata B Rao <bharata@linux.vnet.ibm.com>
Date: Thu, 28 Aug 2008 09:12:49 +0000 (+0530)
Subject: sched: call resched_task() conditionally from new task wake up path
X-Git-Tag: v2.6.28-rc1~725^2~2^2~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aec0a5142cb52aaa152d962d84a838e25d520742;p=pandora-kernel.git

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

- 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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