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Groups > linux.kernel > #1398618
| From | Wanpeng Li <kernellwp@gmail.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: PROBLEM: Scheduling latency not respected in CFS with HRTICK enabled |
| Date | 2016-05-11 03:00 +0200 |
| Message-ID | <rxqFj-5B4-1@gated-at.bofh.it> (permalink) |
| References | <rvQaT-7UW-9@gated-at.bofh.it> <rxqFj-5B4-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
2016-05-11 8:53 GMT+08:00 Wanpeng Li <kernellwp@gmail.com>: > 2016-05-06 23:43 GMT+08:00 Tomasz Grabiec <tgrabiec@scylladb.com>: > [...] >> prev_comm=python prev_pid=873 prev_prio=120 prev_state=R ==> >> next_comm=python next_pid=874 next_prio=120 >> python 874 [002] 3273334.932741: probe:hrtick: (ffffffff8109b430) >> python 874 [002] 3273334.932742: sched:sched_stat_runtime: >> comm=python pid=874 runtime=503174 [ns] vruntime=1549788942230752 [ns] > > hrtick fire after almost 0.5ms(the time slice process 874 get). > >> python 874 [002] 3273334.932743: sched:sched_stat_runtime: >> comm=python pid=874 runtime=948 [ns] vruntime=1549788942231700 [ns] >> python 874 [002] 3273334.936240: probe:scheduler_tick: (ffffffff810a1f30) >> python 874 [002] 3273334.936241: sched:sched_stat_runtime: >> comm=python pid=874 runtime=3497530 [ns] vruntime=1549788945729230 >> [ns] > > continue to run another 3.4ms until next normal scheduler tick fire. > >> python 874 [002] 3273334.936249: sched:sched_stat_runtime: >> comm=python pid=874 runtime=8553 [ns] vruntime=1549788945737783 [ns] >> python 874 [002] 3273334.936250: sched:sched_stat_wait: >> comm=python pid=873 delay=4010205 [ns] >> python 874 [002] 3273334.936250: probe:hrtick_start: (ffffffff8109f4f0) >> python 874 [002] 3273334.936251: sched:sched_switch: >> prev_comm=python prev_pid=874 prev_prio=120 prev_state=R ==> >> next_comm=python next_pid=873 next_prio=120 > > So the process 874 continue to run util next scheduler fick event if s/fick event if/tick even if
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PROBLEM: Scheduling latency not respected in CFS with HRTICK enabled Tomasz Grabiec <tgrabiec@scylladb.com> - 2016-05-06 17:50 +0200
Re: PROBLEM: Scheduling latency not respected in CFS with HRTICK enabled Wanpeng Li <kernellwp@gmail.com> - 2016-05-08 02:20 +0200
Re: PROBLEM: Scheduling latency not respected in CFS with HRTICK enabled Tomasz Grabiec <tgrabiec@scylladb.com> - 2016-05-09 11:00 +0200
Re: PROBLEM: Scheduling latency not respected in CFS with HRTICK enabled Wanpeng Li <kernellwp@gmail.com> - 2016-05-11 03:00 +0200
Re: PROBLEM: Scheduling latency not respected in CFS with HRTICK enabled Wanpeng Li <kernellwp@gmail.com> - 2016-05-11 03:00 +0200
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