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readahead_multiplier

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This commit is contained in:
Jan Kaluza 2012-04-17 10:23:59 +02:00
parent 7ceef4705f
commit 1b781271d6
1 changed files with 34 additions and 0 deletions
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34
tuned/plugins/plugin_disk.py
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@ -52,6 +52,8 @@ class DiskPlugin(tuned.plugins.Plugin):
"elevator" : "",
"disk_alpm" : "",
"disk_apm" : "",
"disk_spindown" : "",
"disk_readahead_multiplier" : "",
}
def _update_idle(self, dev):
@ -101,6 +103,7 @@ class DiskPlugin(tuned.plugins.Plugin):
os.system("hdparm -S0 -B255 /dev/"+dev+" > /dev/null 2>&1")
self._revert_elevator(dev)
self._revert_disk_apm(dev)
self._revert_disk_readahead_multiplier(dev)
self._revert_disk_alpm()
@ -110,6 +113,8 @@ class DiskPlugin(tuned.plugins.Plugin):
if not self._elevator_set:
self._apply_elevator(dev)
self._apply_disk_apm(dev)
self._apply_disk_spindown(dev)
self._apply_disk_readahead_multiplier(dev)
self._init_stats(dev)
self._update_stats(dev, devload)
@ -205,4 +210,33 @@ class DiskPlugin(tuned.plugins.Plugin):
if storage.data["disk"].has_key("disk_apm_" + dev):
tuned.utils.commands.execute(["hdparm", "-B", storage.data["disk"]["disk_apm_" + dev], "/dev/" + dev])
del storage.data["disk"]["disk_apm_" + dev]
def _apply_disk_spindown(self, dev):
if len(self._options["disk_spindown"]) == 0:
return False
tuned.utils.commands.execute(["hdparm", "-S", self._options["disk_spindown"], "/dev/" + dev])
return True
def _apply_disk_readahead_multiplier(self, dev):
self._revert_elevator(dev)
if len(self._options["elevator"]) == 0:
return False
sys_file = os.path.join("/sys/block/", dev, "queue/read_ahead_kb")
try:
value = open(sys_file).read().strip()
except (OSError,IOError) as e:
log.error("Reading %s error: %s" % (sys_file, e))
return
new_value = int(int(value) * float(self._options["disk_readahead_multiplier"]))
tuned.utils.commands.set_file("disk", "disk_readahead_multiplier_" + dev, sys_file, str(new_value))
return True
def _revert_disk_readahead_multiplier(self, dev):
sys_file = os.path.join("/sys/block/", dev, "queue/read_ahead_kb")
tuned.utils.commands.revert_file("disk", "disk_readahead_multiplier_" + dev, sys_file)