diff mbox series

[linux-next,v2,2/4] sched/psi: Avoid update triggers and rtpoll_total when it is unnecessary

Message ID 202310101120445530640@zte.com.cn
State New
Headers
Series sched/psi: Optimize the process of updating triggers and rtpoll_total |

Commit Message

Yang Yang Oct. 10, 2023, 3:20 a.m. UTC 
  From: Yang Yang <yang.yang29@zte.com.cn>

When psimon wakes up and there are no state changes for rtpoll_states,
it's unnecessary to update triggers and rtpoll_total because the pressures
being monitored by user had not changed.
This will help to slightly reduce unnecessary computations of psi.

Signed-off-by: Yang Yang <yang.yang29@zte.com.cn>
Cc: Zhang Yunkai <zhang.yunkai@zte.com.cn>
Cc: Ran Xiaokai <ran.xiaokai@zte.com.cn>
---
 kernel/sched/psi.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
index fec8aab096a8..143f8eb34f9d 100644
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@@ -705,10 +705,11 @@  static void psi_rtpoll_work(struct psi_group *group)

 	if (now >= group->rtpoll_next_update) {
 		group->rtpoll_next_update = now + group->rtpoll_min_period;
-		update_triggers(group, now, &update_total, PSI_POLL);
-		if (update_total)
+		if (changed_states & group->rtpoll_states) {
+			update_triggers(group, now, &update_total, PSI_POLL);
 			memcpy(group->rtpoll_total, group->total[PSI_POLL],
 				   sizeof(group->rtpoll_total));
+		}
 	}

 	psi_schedule_rtpoll_work(group,