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author | Sripathi Kodi <sripathik@in.ibm.com> | 2008-11-05 18:57:14 +0530 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-11-06 22:12:09 +0100 |
commit | cf7f8690e864c6fe11e77202dd847fa60f483418 (patch) | |
tree | 9f0e3cca10a550698c3761c3ee5de6496ecf1e78 /sound | |
parent | e113a745f693af196c8081b328bf42def086989b (diff) | |
download | op-kernel-dev-cf7f8690e864c6fe11e77202dd847fa60f483418.zip op-kernel-dev-cf7f8690e864c6fe11e77202dd847fa60f483418.tar.gz |
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 'sound')
0 files changed, 0 insertions, 0 deletions