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| author | Vincent Guittot <[email protected]> | 2020-06-24 15:44:22 +0000 |
|---|---|---|
| committer | Borislav Petkov <[email protected]> | 2020-06-28 15:01:20 +0000 |
| commit | e21cf43406a190adfcc4bfe592768066fb3aaa9b (patch) | |
| tree | e5f7d137033c19c399fc285d5931a737f7be4f2f /scripts/gcc-plugins/sancov_plugin.c | |
| parent | smp, irq_work: Continue smp_call_function*() and irq_work*() integration (diff) | |
| download | kernel-e21cf43406a190adfcc4bfe592768066fb3aaa9b.tar.gz kernel-e21cf43406a190adfcc4bfe592768066fb3aaa9b.zip | |
sched/cfs: change initial value of runnable_avg
Some performance regression on reaim benchmark have been raised with
commit 070f5e860ee2 ("sched/fair: Take into account runnable_avg to classify group")
The problem comes from the init value of runnable_avg which is initialized
with max value. This can be a problem if the newly forked task is finally
a short task because the group of CPUs is wrongly set to overloaded and
tasks are pulled less agressively.
Set initial value of runnable_avg equals to util_avg to reflect that there
is no waiting time so far.
Fixes: 070f5e860ee2 ("sched/fair: Take into account runnable_avg to classify group")
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Vincent Guittot <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Diffstat (limited to 'scripts/gcc-plugins/sancov_plugin.c')
0 files changed, 0 insertions, 0 deletions