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7fae6c8171
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. Co-developed-by: Muchun Song <songmuchun@bytedance.com> Signed-off-by: Muchun Song <songmuchun@bytedance.com> Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Link: https://lkml.kernel.org/r/20210303034659.91735-3-zhouchengming@bytedance.com |
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