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| author | Sripathi Kodi | 2008-11-05 14:27:14 +0100 |
|---|---|---|
| committer | Ingo Molnar | 2008-11-06 22:12:09 +0100 |
| commit | cf7f8690e864c6fe11e77202dd847fa60f483418 (patch) | |
| tree | 9f0e3cca10a550698c3761c3ee5de6496ecf1e78 /kernel/sched.c | |
| parent | sched/rt: small optimization to update_curr_rt() (diff) | |
| download | kernel-qcow2-linux-cf7f8690e864c6fe11e77202dd847fa60f483418.tar.gz kernel-qcow2-linux-cf7f8690e864c6fe11e77202dd847fa60f483418.tar.xz kernel-qcow2-linux-cf7f8690e864c6fe11e77202dd847fa60f483418.zip | |
sched, lockdep: inline double_unlock_balance()
We have a test case which measures the variation in the amount of time
needed to perform a fixed amount of work on the preempt_rt kernel. We
started seeing deterioration in it's performance recently. The test
should never take more than 10 microseconds, but we started 5-10%
failure rate.
Using elimination method, we traced the problem to commit
1b12bbc747560ea68bcc132c3d05699e52271da0 (lockdep: re-annotate
scheduler runqueues).
When LOCKDEP is disabled, this patch only adds an additional function
call to double_unlock_balance(). Hence I inlined double_unlock_balance()
and the problem went away. Here is a patch to make this change.
Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index e8819bc6f462..ad10d0aae1d7 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -2825,7 +2825,7 @@ static int double_lock_balance(struct rq *this_rq, struct rq *busiest) return ret; } -static void double_unlock_balance(struct rq *this_rq, struct rq *busiest) +static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest) __releases(busiest->lock) { spin_unlock(&busiest->lock); |