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norefs, disk: reenable readahead_multiply as a custom command

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This commit is contained in:
Jan Vcelak 2012-11-27 18:18:36 +01:00
parent 3991b19662
commit a19e116545
1 changed files with 16 additions and 7 deletions
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23
tuned/plugins/plugin_disk.py
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@ -213,13 +213,22 @@ class DiskPlugin(base.Plugin):
return None
return int(value)
# @command_set("readahead_multiply", per_device=True) #, revert_as="readhead")
# def _multiply_readahead(self, mulitplier, device):
# old_value = self._get_readahead(device)
# new_value = int(old_value * float(multiplier))
# # TODO: implement revert_as (or something suitable)
# log.warn("readhead_multiply not implemented")
# #self._set_readahead(new_value, device)
@command_custom("readahead_multiply", per_device=True)
def _multiply_readahead(self, enabling, multiplier, device):
storage_key = self._storage_key("readahead_multiply", device)
if enabling:
old_readahead = self._get_readahead(device)
if old_readahead is None:
return
new_readahead = int(float(multiplier) * old_readahead)
self._storage.set(storage_key, old_readahead)
self._set_readahead(new_readahead, device)
else:
old_readahead = self._storage.get(storage_key)
if old_readahead is None:
return
self._set_readahead(old_readahead, device)
self._storage.unset(storage_key)
def _scheduler_quantum_file(self, device):
return os.path.join("/sys/block/", device, "queue/iosched/quantum")