ANDROID: sched/fair: Add eas (& cas) specific rq, sd and task stats
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>
[fixed schedstat macros calls to match modifications
made in commit ae92882e5646d8661a3ca182ba988752fe4b773f]
Signed-off-by: Quentin Perret <quentin.perret@arm.com>
5 files changed