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kvm_stat: allow choosing between tracepoints and old stats 

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)