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authorSteven Rostedt <srostedt@redhat.com>2010-12-06 17:10:31 -0500
committerSteven Rostedt <rostedt@goodmis.org>2010-12-13 19:56:43 -0500
commite69c634190dc724ef2d845ace8d783031d3e492e (patch)
tree03c16d8f6f3ec24408adbe9042bc42546725141a /kernel/sched_rt.c
parent63f01241176d7cbc976385aec32f0a209b0bc36a (diff)
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sched: Remove unlikely() from ttwu_post_activation
The unlikely() used in ttwu_post_activation() tests if the rq->idle_stamp is set. But since this is for a wakeup, and wakeups happen when tasks block on IO, and blocking tasks on IO may put the system into idle, this can actually be a common occurence. Running the annotated branch profiler on an average desktop running firefox, evolution, xchat and distcc, the report shows: correct incorrect % Function File Line ------- --------- - -------- ---- ---- 34884862 146110926 80 ttwu_post_activation sched.c 2309 80% of the time, this unlikely is incorrect. Best not to assume what the result is, and just remove the branch annotation. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/sched_rt.c')
0 files changed, 0 insertions, 0 deletions
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