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authorStefan Raspl <raspl@linux.vnet.ibm.com>2017-03-10 13:40:04 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2017-03-29 12:01:26 +0200
commita183606937489ab5ada2215aa8211374a6b26bd3 (patch)
tree24ebd8ff2b2cdd8f99fa8f06d6e7930fa616feb7 /tools/kvm/kvm_stat
parente0ba38765c1d1d670246d6f6c518594aa8e62587 (diff)
downloadlinux-a183606937489ab5ada2215aa8211374a6b26bd3.tar.bz2
tools/kvm_stat: fix trace setup glitch on field updates in TracepointProvider
Updating the fields of the TracepointProvider does not propagate changes to the tracepoints. This shows when a pid filter is enabled, whereby subsequent extensions of the fields of the Tracepoint provider (e.g. by toggling drilldown) will not modify the tracepoints as required. To reproduce, select a specific process via interactive command 'p', and enable drilldown via 'x' - none of the fields with the braces will appear although they should. The fix will always leave all available fields in the TracepointProvider enabled. Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com> Based-on-text-by: Janosch Frank <frankja@linux.vnet.ibm.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'tools/kvm/kvm_stat')
-rwxr-xr-xtools/kvm/kvm_stat/kvm_stat5
1 files changed, 3 insertions, 2 deletions
diff --git a/tools/kvm/kvm_stat/kvm_stat b/tools/kvm/kvm_stat/kvm_stat
index 231186a773aa..6207843b9199 100755
--- a/tools/kvm/kvm_stat/kvm_stat
+++ b/tools/kvm/kvm_stat/kvm_stat
@@ -550,6 +550,7 @@ class TracepointProvider(object):
def setup_traces(self):
"""Creates all event and group objects needed to be able to retrieve
data."""
+ fields = self.get_available_fields()
if self._pid > 0:
# Fetch list of all threads of the monitored pid, as qemu
# starts a thread for each vcpu.
@@ -560,7 +561,7 @@ class TracepointProvider(object):
# The constant is needed as a buffer for python libs, std
# streams and other files that the script opens.
- newlim = len(groupids) * len(self._fields) + 50
+ newlim = len(groupids) * len(fields) + 50
try:
softlim_, hardlim = resource.getrlimit(resource.RLIMIT_NOFILE)
@@ -576,7 +577,7 @@ class TracepointProvider(object):
for groupid in groupids:
group = Group()
- for name in self._fields:
+ for name in fields:
tracepoint = name
tracefilter = None
match = re.match(r'(.*)\((.*)\)', name)