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| author | Sripathi Kodi <sripathik@in.ibm.com> | 2008-11-05 14:27:14 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-06 22:12:09 +0100 |
| commit | cf7f8690e864c6fe11e77202dd847fa60f483418 (patch) | |
| tree | 9f0e3cca10a550698c3761c3ee5de6496ecf1e78 /kernel/sched_rt.c | |
| parent | sched/rt: small optimization to update_curr_rt() (diff) | |
| download | linux-cf7f8690e864c6fe11e77202dd847fa60f483418.tar.xz 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_rt.c')
| -rw-r--r-- | kernel/sched_rt.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c index c7963d5d0625..2bdd44423599 100644 --- a/kernel/sched_rt.c +++ b/kernel/sched_rt.c @@ -910,7 +910,8 @@ static void put_prev_task_rt(struct rq *rq, struct task_struct *p) #define RT_MAX_TRIES 3 static int double_lock_balance(struct rq *this_rq, struct rq *busiest); -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); static void deactivate_task(struct rq *rq, struct task_struct *p, int sleep); |