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perf diff: Add -F option to display formula for computation

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Adding -F option to display the formula for specified computation.

This is mainly to facilitate debugging, but can be useful anyway.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1349448287-18919-7-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2012-10-05 16:44:45 +02:00 • committed by Arnaldo Carvalho de Melo
parent 61949b212e
commit ed279da2fc
5 changed files with 96 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

67
tools/perf/builtin-diff.c
View file

@ -25,6 +25,7 @@ static char diff__default_sort_order[] = "dso,symbol";
static bool force;
static bool show_displacement;
static bool show_period;
static bool show_formula;
static bool show_baseline_only;
static bool sort_compute;
@ -190,6 +191,62 @@ s64 perf_diff__compute_wdiff(struct hist_entry *he)
return he->diff.wdiff;
}
static int formula_delta(struct hist_entry *he, char *buf, size_t size)
{
struct hist_entry *pair = he->pair;
if (!pair)
return -1;
return scnprintf(buf, size,
"(%" PRIu64 " * 100 / %" PRIu64 ") - "
"(%" PRIu64 " * 100 / %" PRIu64 ")",
he->stat.period, he->hists->stats.total_period,
pair->stat.period, pair->hists->stats.total_period);
}
static int formula_ratio(struct hist_entry *he, char *buf, size_t size)
{
struct hist_entry *pair = he->pair;
double new_period = he->stat.period;
double old_period = pair ? pair->stat.period : 0;
if (!pair)
return -1;
return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
}
static int formula_wdiff(struct hist_entry *he, char *buf, size_t size)
{
struct hist_entry *pair = he->pair;
u64 new_period = he->stat.period;
u64 old_period = pair ? pair->stat.period : 0;
if (!pair)
return -1;
return scnprintf(buf, size,
"(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
}
int perf_diff__formula(char *buf, size_t size, struct hist_entry *he)
{
switch (compute) {
case COMPUTE_DELTA:
return formula_delta(he, buf, size);
case COMPUTE_RATIO:
return formula_ratio(he, buf, size);
case COMPUTE_WEIGHTED_DIFF:
return formula_wdiff(he, buf, size);
default:
BUG_ON(1);
}
return -1;
}
static int hists__add_entry(struct hists *self,
struct addr_location *al, u64 period)
{
@ -543,6 +600,8 @@ static const struct option options[] = {
setup_compute),
OPT_BOOLEAN('p', "period", &show_period,
"Show period values."),
OPT_BOOLEAN('F', "formula", &show_formula,
"Show formula."),
OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
"dump raw trace in ASCII"),
OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
@ -571,7 +630,10 @@ static void ui_init(void)
/* No overhead column. */
perf_hpp__column_enable(PERF_HPP__OVERHEAD, false);
/* Display baseline/delta/ratio/displacement/periods columns. */
/*
* Display baseline/delta/ratio/displacement/
* formula/periods columns.
*/
perf_hpp__column_enable(PERF_HPP__BASELINE, true);
switch (compute) {
@ -591,6 +653,9 @@ static void ui_init(void)
if (show_displacement)
perf_hpp__column_enable(PERF_HPP__DISPL, true);
if (show_formula)
perf_hpp__column_enable(PERF_HPP__FORMULA, true);
if (show_period) {
perf_hpp__column_enable(PERF_HPP__PERIOD, true);
perf_hpp__column_enable(PERF_HPP__PERIOD_BASELINE, true);