48d818f6e3
The statistic counter are placed in the eas (& cas) wakeup path. Each of them has one representation for the runqueue (rq), the sched_domain (sd) and the task. A task counter is always incremented. A rq counter is always incremented for the rq the scheduler is currently running on. A sd counter is only incremented if a relation to a sd exists. The counters are exposed: (1) In /proc/schedstat for rq's and sd's: $ cat /proc/schedstat ... cpu0 71422 0 2321254 ... eas 44144 0 0 19446 0 24698 568435 51621 156932 133 222011 17459 120279 516814 83 0 156962 359235 176439 139981 <- runqueue for cpu0 ... domain0 3 42430 42331 ... eas 0 0 0 14200 0 0 0 0 0 0 0 0 0 0 0 0 0 0 66355 0 <- MC sched domain for cpu0 ... The per-cpu eas vector has the following elements: sis_attempts sis_idle sis_cache_affine sis_suff_cap sis_idle_cpu sis_count || secb_attempts secb_sync secb_idle_bt secb_insuff_cap secb_no_nrg_sav secb_nrg_sav secb_count || fbt_attempts fbt_no_cpu fbt_no_sd fbt_pref_idle fbt_count || cas_attempts cas_count The following relations exist between these counters (from cpu0 eas vector above): sis_attempts = sis_idle + sis_cache_affine + sis_suff_cap + sis_idle_cpu + sis_count 44144 = 0 + 0 + 19446 + 0 + 24698 secb_attempts = secb_sync + secb_idle_bt + secb_insuff_cap + secb_no_nrg_sav + secb_nrg_sav + secb_count 568435 = 51621 + 156932 + 133 + 222011 + 17459 + 120279 fbt_attempts = fbt_no_cpu + fbt_no_sd + fbt_pref_idle + fbt_count + (return -1) 516814 = 83 + 0 + 156962 + 359235 + (534) cas_attempts = cas_count + (return -1 or smp_processor_id()) 176439 = 139981 + (36458) (2) In /proc/$PROCESS_PID/task/$TASK_PID/sched for a task. example: main thread of system_server $ cat /proc/1083/task/1083/sched ... se.statistics.nr_wakeups_sis_attempts : 945 se.statistics.nr_wakeups_sis_idle : 0 se.statistics.nr_wakeups_sis_cache_affine : 0 se.statistics.nr_wakeups_sis_suff_cap : 219 se.statistics.nr_wakeups_sis_idle_cpu : 0 se.statistics.nr_wakeups_sis_count : 726 se.statistics.nr_wakeups_secb_attempts : 10376 se.statistics.nr_wakeups_secb_sync : 1462 se.statistics.nr_wakeups_secb_idle_bt : 6984 se.statistics.nr_wakeups_secb_insuff_cap : 3 se.statistics.nr_wakeups_secb_no_nrg_sav : 927 se.statistics.nr_wakeups_secb_nrg_sav : 206 se.statistics.nr_wakeups_secb_count : 794 se.statistics.nr_wakeups_fbt_attempts : 8914 se.statistics.nr_wakeups_fbt_no_cpu : 0 se.statistics.nr_wakeups_fbt_no_sd : 0 se.statistics.nr_wakeups_fbt_pref_idle : 6987 se.statistics.nr_wakeups_fbt_count : 1554 se.statistics.nr_wakeups_cas_attempts : 3107 se.statistics.nr_wakeups_cas_count : 1195 ... The same relation between the counters as in the per-cpu case apply. Change-Id: Ie7d01267c78a3f41f60a3ef52917d5a5d463f195 Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Signed-off-by: Chris Redpath <chris.redpath@arm.com> |
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| .. | ||
| acpi | ||
| asm-generic | ||
| clocksource | ||
| crypto | ||
| drm | ||
| dt-bindings | ||
| keys | ||
| kvm | ||
| linux | ||
| math-emu | ||
| media | ||
| memory | ||
| misc | ||
| net | ||
| pcmcia | ||
| ras | ||
| rdma | ||
| rxrpc | ||
| scsi | ||
| soc | ||
| sound | ||
| target | ||
| trace | ||
| uapi | ||
| video | ||
| xen | ||
| Kbuild | ||