Commit 0076d546 authored by Feng Tang's avatar Feng Tang Committed by Arnaldo Carvalho de Melo

perf scripts python: Add event_analyzing_sample.py as a sample for general event handling

Currently only trace point events are supported in perf/python script,
the first 3 patches of this serie add the support for all types of
events. This script is just a simple sample to show how to gather the
basic information of the events and analyze them.

This script will create one object for each event sample and insert them
into a table in a database, then leverage the simple SQL commands to
sort/group them. User can modify or write their brand new functions
according to their specific requirment.

Here is the sample of how to use the script:

 $ perf record -a tree
 $ perf script -s process_event.py

There is 100 records in gen_events table
Statistics about the general events grouped by thread/symbol/dso:

            comm   number         histgram
==========================================
         swapper       56     ######
            tree       20     #####
            perf       10     ####
            sshd        8     ####
     kworker/7:2        4     ###
     ksoftirqd/7        1     #
 plugin-containe        1     #

                          symbol   number         histgram
==========================================================
           native_write_msr_safe       40     ######
                  __lock_acquire        8     ####
             ftrace_graph_caller        4     ###
           prepare_ftrace_return        4     ###
                      intel_idle        3     ##
              native_sched_clock        3     ##
                  Unknown_symbol        2     ##
                      do_softirq        2     ##
                    lock_release        2     ##
           lock_release_holdtime        2     ##
               trace_graph_entry        2     ##
                        _IO_putc        1     #
                  __d_lookup_rcu        1     #
                      __do_fault        1     #
                      __schedule        1     #
                  _raw_spin_lock        1     #
                       delay_tsc        1     #
             generic_exec_single        1     #
                generic_fillattr        1     #

                                     dso   number         histgram
==================================================================
                       [kernel.kallsyms]       95     #######
                     /lib/libc-2.12.1.so        5     ###
Signed-off-by: default avatarFeng Tang <feng.tang@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1344419875-21665-6-git-send-email-feng.tang@intel.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 02f1c33f
# process_event.py: general event handler in python
#
# Current perf report is alreay very powerful with the anotation integrated,
# and this script is not trying to be as powerful as perf report, but
# providing end user/developer a flexible way to analyze the events other
# than trace points.
#
# The 2 database related functions in this script just show how to gather
# the basic information, and users can modify and write their own functions
# according to their specific requirment.
#
# The first sample "show_general_events" just does a baisc grouping for all
# generic events with the help of sqlite, and the 2nd one "show_pebs_ll" is
# for a x86 HW PMU event: PEBS with load latency data.
#
import os
import sys
import math
import struct
import sqlite3
sys.path.append(os.environ['PERF_EXEC_PATH'] + \
'/scripts/python/Perf-Trace-Util/lib/Perf/Trace')
from perf_trace_context import *
from EventClass import *
#
# If the perf.data has a big number of samples, then the insert operation
# will be very time consuming (about 10+ minutes for 10000 samples) if the
# .db database is on disk. Move the .db file to RAM based FS to speedup
# the handling, which will cut the time down to several seconds.
#
con = sqlite3.connect("/dev/shm/perf.db")
con.isolation_level = None
def trace_begin():
print "In trace_begin:\n"
#
# Will create several tables at the start, pebs_ll is for PEBS data with
# load latency info, while gen_events is for general event.
#
con.execute("""
create table if not exists gen_events (
name text,
symbol text,
comm text,
dso text
);""")
con.execute("""
create table if not exists pebs_ll (
name text,
symbol text,
comm text,
dso text,
flags integer,
ip integer,
status integer,
dse integer,
dla integer,
lat integer
);""")
#
# Create and insert event object to a database so that user could
# do more analysis with simple database commands.
#
def process_event(param_dict):
event_attr = param_dict["attr"]
sample = param_dict["sample"]
raw_buf = param_dict["raw_buf"]
comm = param_dict["comm"]
name = param_dict["ev_name"]
# Symbol and dso info are not always resolved
if (param_dict.has_key("dso")):
dso = param_dict["dso"]
else:
dso = "Unknown_dso"
if (param_dict.has_key("symbol")):
symbol = param_dict["symbol"]
else:
symbol = "Unknown_symbol"
# Creat the event object and insert it to the right table in database
event = create_event(name, comm, dso, symbol, raw_buf)
insert_db(event)
def insert_db(event):
if event.ev_type == EVTYPE_GENERIC:
con.execute("insert into gen_events values(?, ?, ?, ?)",
(event.name, event.symbol, event.comm, event.dso))
elif event.ev_type == EVTYPE_PEBS_LL:
event.ip &= 0x7fffffffffffffff
event.dla &= 0x7fffffffffffffff
con.execute("insert into pebs_ll values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
(event.name, event.symbol, event.comm, event.dso, event.flags,
event.ip, event.status, event.dse, event.dla, event.lat))
def trace_end():
print "In trace_end:\n"
# We show the basic info for the 2 type of event classes
show_general_events()
show_pebs_ll()
con.close()
#
# As the event number may be very big, so we can't use linear way
# to show the histgram in real number, but use a log2 algorithm.
#
def num2sym(num):
# Each number will have at least one '#'
snum = '#' * (int)(math.log(num, 2) + 1)
return snum
def show_general_events():
# Check the total record number in the table
count = con.execute("select count(*) from gen_events")
for t in count:
print "There is %d records in gen_events table" % t[0]
if t[0] == 0:
return
print "Statistics about the general events grouped by thread/symbol/dso: \n"
# Group by thread
commq = con.execute("select comm, count(comm) from gen_events group by comm order by -count(comm)")
print "\n%16s %8s %16s\n%s" % ("comm", "number", "histgram", "="*42)
for row in commq:
print "%16s %8d %s" % (row[0], row[1], num2sym(row[1]))
# Group by symbol
print "\n%32s %8s %16s\n%s" % ("symbol", "number", "histgram", "="*58)
symbolq = con.execute("select symbol, count(symbol) from gen_events group by symbol order by -count(symbol)")
for row in symbolq:
print "%32s %8d %s" % (row[0], row[1], num2sym(row[1]))
# Group by dso
print "\n%40s %8s %16s\n%s" % ("dso", "number", "histgram", "="*74)
dsoq = con.execute("select dso, count(dso) from gen_events group by dso order by -count(dso)")
for row in dsoq:
print "%40s %8d %s" % (row[0], row[1], num2sym(row[1]))
#
# This function just shows the basic info, and we could do more with the
# data in the tables, like checking the function parameters when some
# big latency events happen.
#
def show_pebs_ll():
count = con.execute("select count(*) from pebs_ll")
for t in count:
print "There is %d records in pebs_ll table" % t[0]
if t[0] == 0:
return
print "Statistics about the PEBS Load Latency events grouped by thread/symbol/dse/latency: \n"
# Group by thread
commq = con.execute("select comm, count(comm) from pebs_ll group by comm order by -count(comm)")
print "\n%16s %8s %16s\n%s" % ("comm", "number", "histgram", "="*42)
for row in commq:
print "%16s %8d %s" % (row[0], row[1], num2sym(row[1]))
# Group by symbol
print "\n%32s %8s %16s\n%s" % ("symbol", "number", "histgram", "="*58)
symbolq = con.execute("select symbol, count(symbol) from pebs_ll group by symbol order by -count(symbol)")
for row in symbolq:
print "%32s %8d %s" % (row[0], row[1], num2sym(row[1]))
# Group by dse
dseq = con.execute("select dse, count(dse) from pebs_ll group by dse order by -count(dse)")
print "\n%32s %8s %16s\n%s" % ("dse", "number", "histgram", "="*58)
for row in dseq:
print "%32s %8d %s" % (row[0], row[1], num2sym(row[1]))
# Group by latency
latq = con.execute("select lat, count(lat) from pebs_ll group by lat order by lat")
print "\n%32s %8s %16s\n%s" % ("latency", "number", "histgram", "="*58)
for row in latq:
print "%32s %8d %s" % (row[0], row[1], num2sym(row[1]))
def trace_unhandled(event_name, context, event_fields_dict):
print ' '.join(['%s=%s'%(k,str(v))for k,v in sorted(event_fields_dict.items())])
def print_header(event_name, cpu, secs, nsecs, pid, comm):
print "%-20s %5u %05u.%09u %8u %-20s " % \
(event_name, cpu, secs, nsecs, pid, comm),
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