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plugin_cpu: Support cstate settings of pm_qos_resume_latency_us

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The `force_latency` option already supports using C-state IDs/names.
This commit extends the support to the `pm_qos_resume_latency_us` option,
together with the ability to set fallback values (including the special
"n/a" value which disables all C-states).

Resolves: RHEL-21129
This commit is contained in:
Pavol Žáčik 2024-01-11 11:02:08 +01:00
parent 954bc4624d
commit 1183333c52
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GPG key ID: B99527D5E6487A92
1 changed files with 8 additions and 13 deletions
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21
tuned/plugins/plugin_cpu.py
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@ -458,7 +458,7 @@ class CPULatencyPlugin(hotplug.Plugin):
return latency
# returns (latency, skip), skip means we want to skip latency settings
def _parse_latency(self, latency):
def _parse_latency(self, latency, allow_na=False):
self.cstates_latency = None
latencies = str(latency).split("|")
log.debug("parsing latency")
@ -478,6 +478,8 @@ class CPULatencyPlugin(hotplug.Plugin):
elif latency in ["none", "None"]:
log.debug("latency 'none' specified")
return None, True
elif allow_na and latency == "n/a":
pass
else:
latency = None
log.debug("invalid latency specified: '%s'" % str(latency))
@ -717,18 +719,11 @@ class CPULatencyPlugin(hotplug.Plugin):
if not self._is_cpu_online(device):
log.debug("%s is not online, skipping" % device)
return None
try:
latency = int(pm_qos_resume_latency_us)
log.debug("parsed directly specified latency value: %d" % latency)
if latency < 0:
raise ValueError
except ValueError:
if pm_qos_resume_latency_us == "n/a":
latency = pm_qos_resume_latency_us
else:
log.warning("Invalid latency specified: '%s'" % str(pm_qos_resume_latency_us))
return None
if not self._check_pm_qos_resume_latency_us(device):
latency, skip = self._parse_latency(pm_qos_resume_latency_us, allow_na=True)
if skip or not self._check_pm_qos_resume_latency_us(device):
return None
if latency is None or (latency != "n/a" and latency < 0):
log.warning("Failed to set pm_qos_resume_latency_us on cpu '%s'. Is the value in the profile correct?" % device)
return None
if not sim:
self._cmd.write_to_file(self._pm_qos_resume_latency_us_path(device), latency, \