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perf script python: Add dict fields introduction to Documentation

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Add a brief introduction about fields to perf-script-python.txt.

It should help python script developers in easily finding what fields
are supported.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1527843663-32288-4-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jin Yao 2018-06-01 17:01:03 +08:00 committed by Arnaldo Carvalho de Melo
parent 48a1f56526
commit ac56aa4549
1 changed files with 26 additions and 0 deletions
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tools/perf/Documentation/perf-script-python.txt
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@ -610,6 +610,32 @@ Various utility functions for use with perf script:
nsecs_str(nsecs) - returns printable string in the form secs.nsecs
avg(total, n) - returns average given a sum and a total number of values
SUPPORTED FIELDS
----------------
Currently supported fields:
ev_name, comm, pid, tid, cpu, ip, time, period, phys_addr, addr,
symbol, dso, time_enabled, time_running, values, callchain,
brstack, brstacksym, datasrc, datasrc_decode, iregs, uregs,
weight, transaction, raw_buf, attr.
Some fields have sub items:
brstack:
from, to, from_dsoname, to_dsoname, mispred,
predicted, in_tx, abort, cycles.
brstacksym:
items: from, to, pred, in_tx, abort (converted string)
For example,
We can use this code to print brstack "from", "to", "cycles".
if 'brstack' in dict:
for entry in dict['brstack']:
print "from %s, to %s, cycles %s" % (entry["from"], entry["to"], entry["cycles"])
SEE ALSO
--------
linkperf:perf-script[1]