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cpupower: Enable disabled Cstates if they are below max latency 

cpupower idle-set -D <latency>
currently only disables all C-states that have a higher latency than the
specified <latency>. But if deep sleep states were already disabled and
have a lower latency, they should get enabled again.

For example:
This call:
cpupower idle-set -D 30
disables all C-states with a higher or equal latency than 30.
If one then calls:
cpupower idle-set -D 100
C-states with a latency between 30-99 will get enabled again with this patch
now. It is ensured that only C-states with a latency of 100 and higher are
disabled.

Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
Thomas Renninger 2015-10-22 17:17:07 +02:00 committed by Rafael J. Wysocki
parent 645209472d
commit 19c9fb896f
2 changed files with 16 additions and 5 deletions
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4
tools/power/cpupower/man/cpupower-idle-set.1
View File

@ -20,7 +20,9 @@ Disable a specific processor sleep state.
Enable a specific processor sleep state.
.TP
\fB\-D\fR \fB\-\-disable-by-latency\fR <LATENCY>
Disable all idle states with a equal or higher latency than <LATENCY>
Disable all idle states with a equal or higher latency than <LATENCY>.
Enable all idle states with a latency lower than <LATENCY>.
.TP
\fB\-E\fR \fB\-\-enable-all\fR
Enable all idle states if not enabled already.

17
tools/power/cpupower/utils/cpuidle-set.c
View File

@ -148,12 +148,21 @@ int cmd_idle_set(int argc, char **argv)
(cpu, idlestate);
state_latency = sysfs_get_idlestate_latency
(cpu, idlestate);
if (disabled == 1 || latency > state_latency)
if (disabled == 1) {
if (latency > state_latency){
ret = sysfs_idlestate_disable
(cpu, idlestate, 0);
if (ret == 0)
printf(_("Idlestate %u enabled on CPU %u\n"), idlestate, cpu);
}
continue;
ret = sysfs_idlestate_disable
(cpu, idlestate, 1);
if (ret == 0)
}
if (latency <= state_latency){
ret = sysfs_idlestate_disable
(cpu, idlestate, 1);
if (ret == 0)
printf(_("Idlestate %u disabled on CPU %u\n"), idlestate, cpu);
}
}
break;
case 'E':