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| author | Lina Iyer <ilina@codeaurora.org> | 2020-09-22 12:34:16 -0600 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-09-23 14:10:31 +0200 |
| commit | f49735f4978f479b0de4f50ab217d5a56bc83c55 (patch) | |
| tree | ff16650624327711ecff8d9a6b2b885585dd9245 /drivers/cpuidle | |
| parent | 70c179b49870929ca183421935415622d30875b5 (diff) | |
| download | linux-f49735f4978f479b0de4f50ab217d5a56bc83c55.tar.gz | |
cpuidle: record state entry rejection statistics
CPUs may fail to enter the chosen idle state if there was a
pending interrupt, causing the cpuidle driver to return an error
value.
Record that and export it via sysfs along with the other idle state
statistics.
This could prove useful in understanding behavior of the governor
and the system during usecases that involve multiple CPUs.
Signed-off-by: Lina Iyer <ilina@codeaurora.org>
[ rjw: Changelog and documentation edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpuidle')
| -rw-r--r-- | drivers/cpuidle/cpuidle.c | 1 | ||||
| -rw-r--r-- | drivers/cpuidle/sysfs.c | 3 |
2 files changed, 4 insertions, 0 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 6c7e5621cf9a8..0ed5030b89d6d 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -307,6 +307,7 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, } } else { dev->last_residency_ns = 0; + dev->states_usage[index].rejected++; } return entered_state; diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c index 091d1caceb417..53ec9585ccd44 100644 --- a/drivers/cpuidle/sysfs.c +++ b/drivers/cpuidle/sysfs.c @@ -256,6 +256,7 @@ define_show_state_time_function(exit_latency) define_show_state_time_function(target_residency) define_show_state_function(power_usage) define_show_state_ull_function(usage) +define_show_state_ull_function(rejected) define_show_state_str_function(name) define_show_state_str_function(desc) define_show_state_ull_function(above) @@ -312,6 +313,7 @@ define_one_state_ro(latency, show_state_exit_latency); define_one_state_ro(residency, show_state_target_residency); define_one_state_ro(power, show_state_power_usage); define_one_state_ro(usage, show_state_usage); +define_one_state_ro(rejected, show_state_rejected); define_one_state_ro(time, show_state_time); define_one_state_rw(disable, show_state_disable, store_state_disable); define_one_state_ro(above, show_state_above); @@ -325,6 +327,7 @@ static struct attribute *cpuidle_state_default_attrs[] = { &attr_residency.attr, &attr_power.attr, &attr_usage.attr, + &attr_rejected.attr, &attr_time.attr, &attr_disable.attr, &attr_above.attr, |