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disk_scheduler_quantum

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This commit is contained in:
Jan Kaluza 2012-04-25 08:25:25 +02:00
parent 2a3422fcd1
commit 0c64bf3926
1 changed files with 22 additions and 0 deletions
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22
tuned/plugins/plugin_disk.py
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@ -48,6 +48,10 @@ class DiskPlugin(tuned.plugins.Plugin):
self.register_command("disk_spindown",
self._set_disk_spindown,
is_per_dev = True)
self.register_command("disk_scheduler_quantum",
self._set_disk_scheduler_quantum,
self._revert_disk_scheduler_quantum,
is_per_dev = True)
@classmethod
def tunable_devices(cls):
@ -73,6 +77,7 @@ class DiskPlugin(tuned.plugins.Plugin):
"disk_apm" : "",
"disk_spindown" : "",
"disk_readahead_multiplier" : "",
"disk_scheduler_quantum" : "",
}
def _update_idle(self, dev):
@ -231,3 +236,20 @@ class DiskPlugin(tuned.plugins.Plugin):
sys_file = os.path.join("/sys/block/", dev, "queue/read_ahead_kb")
tuned.utils.commands.write_to_file(sys_file, value)
@command("disk", "disk_scheduler_quantum")
def _set_disk_scheduler_quantum(self, dev, value):
sys_file = os.path.join("/sys/block/", dev, "queue/iosched/quantum")
old_value = tuned.utils.commands.read_file(sys_file).strip()
if len(old_value) == 0:
log.info("disk_scheduler_quantum option is not supported by this HW")
return ""
tuned.utils.commands.write_to_file(sys_file, value)
return old_value
@command_revert("disk", "disk_scheduler_quantum")
def _revert_disk_scheduler_quantum(self, dev, value):
sys_file = os.path.join("/sys/block/", dev, "queue/iosched/quantum")
tuned.utils.commands.write_to_file(sys_file, value)