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author | Stefan Raspl <raspl@linux.vnet.ibm.com> | 2017-03-10 13:40:04 +0100 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-03-29 12:01:26 +0200 |
commit | a183606937489ab5ada2215aa8211374a6b26bd3 (patch) | |
tree | 24ebd8ff2b2cdd8f99fa8f06d6e7930fa616feb7 /tools/kvm/kvm_stat | |
parent | e0ba38765c1d1d670246d6f6c518594aa8e62587 (diff) | |
download | linux-stable-a183606937489ab5ada2215aa8211374a6b26bd3.tar.gz linux-stable-a183606937489ab5ada2215aa8211374a6b26bd3.tar.bz2 linux-stable-a183606937489ab5ada2215aa8211374a6b26bd3.zip |
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-x | tools/kvm/kvm_stat/kvm_stat | 5 |
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) |