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kvm_stat: allow choosing between tracepoints and old stats

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The old stats contain information not available in the tracepoints.
By default, keep the old behavior, but allow choosing which set of stats
to present, or even both.

Inspired by a patch from Marcelo Tosatti.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-05-21 12:42:26 +02:00
parent a096b3a673
commit b763adf1a6
1 changed files with 41 additions and 19 deletions
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60
scripts/kvm/kvm_stat
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@ -352,8 +352,8 @@ class TracepointProvider(object):
return ret
class Stats:
def __init__(self, provider, fields = None):
self.provider = provider
def __init__(self, providers, fields = None):
self.providers = providers
self.fields_filter = fields
self._update()
def _update(self):
@ -362,22 +362,25 @@ class Stats:
if not self.fields_filter:
return True
return re.match(self.fields_filter, key) is not None
self.values = dict([(key, None)
for key in provider.fields()
if wanted(key)])
self.provider.select(self.values.keys())
self.values = dict()
for d in providers:
provider_fields = [key for key in d.fields() if wanted(key)]
for key in provider_fields:
self.values[key] = None
d.select(provider_fields)
def set_fields_filter(self, fields_filter):
self.fields_filter = fields_filter
self._update()
def get(self):
new = self.provider.read()
for key in self.provider.fields():
oldval = self.values.get(key, (0, 0))
newval = new[key]
newdelta = None
if oldval is not None:
newdelta = newval - oldval[0]
self.values[key] = (newval, newdelta)
for d in providers:
new = d.read()
for key in d.fields():
oldval = self.values.get(key, (0, 0))
newval = new[key]
newdelta = None
if oldval is not None:
newdelta = newval - oldval[0]
self.values[key] = (newval, newdelta)
return self.values
if not os.access('/sys/kernel/debug', os.F_OK):
@ -487,6 +490,18 @@ options.add_option('-l', '--log',
dest = 'log',
help = 'run in logging mode (like vmstat)',
)
options.add_option('-t', '--tracepoints',
action = 'store_true',
default = False,
dest = 'tracepoints',
help = 'retrieve statistics from tracepoints',
)
options.add_option('-d', '--debugfs',
action = 'store_true',
default = False,
dest = 'debugfs',
help = 'retrieve statistics from debugfs',
)
options.add_option('-f', '--fields',
action = 'store',
default = None,
@ -495,12 +510,19 @@ options.add_option('-f', '--fields',
)
(options, args) = options.parse_args(sys.argv)
try:
provider = TracepointProvider()
except:
provider = DebugfsProvider()
providers = []
if options.tracepoints:
providers.append(TracepointProvider())
if options.debugfs:
providers.append(DebugfsProvider())
stats = Stats(provider, fields = options.fields)
if len(providers) == 0:
try:
providers = [TracepointProvider()]
except:
providers = [DebugfsProvider()]
stats = Stats(providers, fields = options.fields)
if options.log:
log(stats)