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simpletrace: document Analyzer method signatures

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Users can inherit from the simpletrace.Analyzer class and receive
callbacks when events of interest occur in a trace file.  The method
signature is a little magic because the timestamp and pid arguments are
optional.  Document this.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20170411095654.18383-1-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2017-04-11 10:56:54 +01:00
parent 3d1baccb08
commit 659370f71f
1 changed files with 22 additions and 1 deletions
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23
scripts/simpletrace.py
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@ -116,7 +116,28 @@ class Analyzer(object):
is invoked.
If a method matching a trace event name exists, it is invoked to process
that trace record. Otherwise the catchall() method is invoked."""
that trace record. Otherwise the catchall() method is invoked.
Example:
The following method handles the runstate_set(int new_state) trace event::
def runstate_set(self, new_state):
...
The method can also take a timestamp argument before the trace event
arguments::
def runstate_set(self, timestamp, new_state):
...
Timestamps have the uint64_t type and are in nanoseconds.
The pid can be included in addition to the timestamp and is useful when
dealing with traces from multiple processes::
def runstate_set(self, timestamp, pid, new_state):
...
"""
def begin(self):
"""Called at the start of the trace."""