On Wed, Mar 03, 2021 at 11:46:57AM +0800, Chengming Zhou wrote: > Move the reclaim detection from the timer tick to the task state > tracking machinery using the recently added ONCPU state. And we > also add task psi_flags changes checking in the psi_task_switch() > optimization to update the parents properly. > > In terms of performance and cost, this ONCPU task state tracking > is not cheaper than previous timer tick in aggregate. But the code is > simpler and shorter this way, so it's a maintainability win. And > Johannes did some testing with perf bench, the performace and cost > changes would be acceptable for real workloads. > > Thanks to Johannes Weiner for pointing out the psi_task_switch() > optimization things and the clearer changelog. > > Signed-off-by: Muchun Song <[email protected]> > Signed-off-by: Chengming Zhou <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
