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ftrace: add support to report function profiling data

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Functions profiling data are reported in a set of files, one for each CPU.

This patch adds the required support to collect these data into a single
JSON formatted file. Data are collected using a shutils routing on the
target side and formatted in JSON on the host side.

Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>
This commit is contained in:
Patrick Bellasi
2016-01-26 15:38:44 +00:00
parent 7f5a150b4f
commit 082a82c7c5
2 changed files with 59 additions and 0 deletions
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15
devlib/bin/scripts/shutils.in
View File

@@ -43,6 +43,18 @@ cpufreq_trace_all_frequencies() {
done
}
################################################################################
# FTrace Utility Functions
################################################################################
ftrace_get_function_stats() {
for CPU in $(ls /sys/kernel/debug/tracing/trace_stat | sed 's/function//'); do
REPLACE_STRING="s/ Function/\n Function (CPU$CPU)/"
cat /sys/kernel/debug/tracing/trace_stat/function$CPU \
| sed "$REPLACE_STRING"
done
}
################################################################################
# Main Function Dispatcher
################################################################################
@@ -63,6 +75,9 @@ cpufreq_get_all_governors)
cpufreq_trace_all_frequencies)
cpufreq_trace_all_frequencies $*
;;
ftrace_get_function_stats)
ftrace_get_function_stats
;;
*)
echo "Command [$CMD] not supported"
exit -1

44
devlib/trace/ftrace.py
View File

@@ -15,7 +15,9 @@
from __future__ import division
import os
import json
import time
import re
import subprocess
from devlib.trace import TraceCollector
@@ -27,6 +29,7 @@ from devlib.utils.misc import check_output, which
TRACE_MARKER_START = 'TRACE_MARKER_START'
TRACE_MARKER_STOP = 'TRACE_MARKER_STOP'
OUTPUT_TRACE_FILE = 'trace.dat'
OUTPUT_PROFILE_FILE = 'trace_stat.dat'
DEFAULT_EVENTS = [
'cpu_frequency',
'cpu_idle',
@@ -40,6 +43,9 @@ DEFAULT_EVENTS = [
]
TIMEOUT = 180
# Regexps for parsing of function profiling data
CPU_RE = re.compile(r' Function \(CPU([0-9]+)\)')
STATS_RE = re.compile(r'([^ ]*) +([0-9]+) +([0-9.]+) us +([0-9.]+) us +([0-9.]+) us')
class FtraceCollector(TraceCollector):
@@ -165,6 +171,44 @@ class FtraceCollector(TraceCollector):
if self.autoview:
self.view(outfile)
def get_stats(self, outfile):
if not self.functions:
return
if os.path.isdir(outfile):
outfile = os.path.join(outfile, OUTPUT_PROFILE_FILE)
output = self.target._execute_util('ftrace_get_function_stats',
as_root=True)
function_stats = {}
for line in output.splitlines():
# Match a new CPU dataset
match = CPU_RE.search(line)
if match:
cpu_id = int(match.group(1))
function_stats[cpu_id] = {}
self.logger.debug("Processing stats for CPU%d...", cpu_id)
continue
# Match a new function dataset
match = STATS_RE.search(line)
if match:
fname = match.group(1)
function_stats[cpu_id][fname] = {
'hits' : int(match.group(2)),
'time' : float(match.group(3)),
'avg' : float(match.group(4)),
's_2' : float(match.group(5)),
}
self.logger.debug(" %s: %s",
fname, function_stats[cpu_id][fname])
self.logger.debug("FTrace stats output [%s]...", outfile)
with open(outfile, 'w') as fh:
json.dump(function_stats, fh, indent=4)
self.logger.info("FTrace function stats save in [%s]", outfile)
return function_stats
def report(self, binfile, destfile):
# To get the output of trace.dat, trace-cmd must be installed
# This is done host-side because the generated file is very large