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scheduler: Add a function for checking if a task is a kthread

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Add a function for checking if a task is a kernel thread.

Signed-off-by: Ondřej Lysoněk <olysonek@redhat.com>
This commit is contained in:
Ondřej Lysoněk 2018-05-28 14:30:06 +02:00
parent 00cda573e3
commit b4ddf47448
1 changed files with 6 additions and 1 deletions
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7
tuned/plugins/plugin_scheduler.py
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@ -189,6 +189,11 @@ class SchedulerPlugin(base.Plugin):
log.error("Failed to set scheduling parameters of PID %d: %s"
% (pid, e))
# process is a procfs.process object
# Raises OSError, IOError
def _is_kthread(self, process):
return process["stat"]["flags"] & procfs.pidstat.PF_KTHREAD != 0
# Return codes:
# 0 - Affinity is fixed
# 1 - Affinity is changeable
@ -201,7 +206,7 @@ class SchedulerPlugin(base.Plugin):
if process["stat"].is_bound_to_cpu():
if process["stat"]["state"] == "Z":
log.debug("Affinity of zombie task with PID %d cannot be changed, the task's affinity mask is fixed." % pid)
elif process["stat"]["flags"] & procfs.pidstat.PF_KTHREAD != 0:
elif self._is_kthread(process):
log.debug("Affinity of kernel thread with PID %d cannot be changed, the task's affinity mask is fixed." % pid)
else:
log.warn("Affinity of task with PID %d cannot be changed, the task's affinity mask is fixed." % pid)