[PATCH 05/14] perf diff: Change compute methods to work with pair directly

Jiri Olsa
2012-11-28T13:53:47Z

Changing compute methods to operate over hist entry and its
pair directly. This makes the code more obvious and readable,
instead of all time checking for pair being != NULL.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/builtin-diff.c | 38 +++++++++++++++++---------------------
tools/perf/ui/hist.c | 40 +++++++++++++++++++++++++---------------
tools/perf/util/hist.h | 7 ++++---
3 files changed, 46 insertions(+), 39 deletions(-)

diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 9fbbc01..342085a 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -146,47 +146,40 @@ static int setup_compute(const struct option *opt, const char *str,
return -EINVAL;
}

-static double get_period_percent(struct hist_entry *he, u64 period)
+double perf_diff__period_percent(struct hist_entry *he, u64 period)
{
u64 total = he->hists->stats.total_period;
return (period * 100.0) / total;
}

-double perf_diff__compute_delta(struct hist_entry *he)
+double perf_diff__compute_delta(struct hist_entry *he, struct hist_entry *pair)
{
- struct hist_entry *pair = hist_entry__next_pair(he);
- double new_percent = get_period_percent(he, he->stat.period);
- double old_percent = pair ? get_period_percent(pair, pair->stat.period) : 0.0;
+ double new_percent = perf_diff__period_percent(he, he->stat.period);
+ double old_percent = perf_diff__period_percent(pair, pair->stat.period);

he->diff.period_ratio_delta = new_percent - old_percent;
he->diff.computed = true;
return he->diff.period_ratio_delta;
}

-double perf_diff__compute_ratio(struct hist_entry *he)
+double perf_diff__compute_ratio(struct hist_entry *he, struct hist_entry *pair)
{
- struct hist_entry *pair = hist_entry__next_pair(he);
double new_period = he->stat.period;
- double old_period = pair ? pair->stat.period : 0;
+ double old_period = pair->stat.period;

he->diff.computed = true;
- he->diff.period_ratio = pair ? (new_period / old_period) : 0;
+ he->diff.period_ratio = new_period / old_period;
return he->diff.period_ratio;
}

-s64 perf_diff__compute_wdiff(struct hist_entry *he)
+s64 perf_diff__compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
{
- struct hist_entry *pair = hist_entry__next_pair(he);
u64 new_period = he->stat.period;
- u64 old_period = pair ? pair->stat.period : 0;
+ u64 old_period = pair->stat.period;

he->diff.computed = true;
-
- if (!pair)
- he->diff.wdiff = 0;
- else
- he->diff.wdiff = new_period * compute_wdiff_w2 -
- old_period * compute_wdiff_w1;
+ he->diff.wdiff = new_period * compute_wdiff_w2 -
+ old_period * compute_wdiff_w1;

return he->diff.wdiff;
}
@@ -385,18 +378,21 @@ static void hists__precompute(struct hists *hists)

while (next != NULL) {
struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node);
+ struct hist_entry *pair = hist_entry__next_pair(he);

next = rb_next(&he->rb_node);
+ if (!pair)
+ continue;

switch (compute) {
case COMPUTE_DELTA:
- perf_diff__compute_delta(he);
+ perf_diff__compute_delta(he, pair);
break;
case COMPUTE_RATIO:
- perf_diff__compute_ratio(he);
+ perf_diff__compute_ratio(he, pair);
break;
case COMPUTE_WEIGHTED_DIFF:
- perf_diff__compute_wdiff(he);
+ perf_diff__compute_wdiff(he, pair);
break;
default:
BUG_ON(1);
diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
index 20a4392..a64c7f9 100644
--- a/tools/perf/ui/hist.c
+++ b/tools/perf/ui/hist.c
@@ -314,14 +314,18 @@ static int hpp__width_delta(struct perf_hpp_fmt *fmt __maybe_unused,
static int hpp__entry_delta(struct perf_hpp_fmt *_fmt __maybe_unused,
struct perf_hpp *hpp, struct hist_entry *he)
{
+ struct hist_entry *pair = hist_entry__next_pair(he);
const char *fmt = symbol_conf.field_sep ? "%s" : "%7.7s";
char buf[32] = " ";
- double diff;
+ double diff = 0.0;

- if (he->diff.computed)
- diff = he->diff.period_ratio_delta;
- else
- diff = perf_diff__compute_delta(he);
+ if (pair) {
+ if (he->diff.computed)
+ diff = he->diff.period_ratio_delta;
+ else
+ diff = perf_diff__compute_delta(he, pair);
+ } else
+ diff = perf_diff__period_percent(he, he->stat.period);

if (fabs(diff) >= 0.01)
scnprintf(buf, sizeof(buf), "%+4.2F%%", diff);
@@ -346,14 +350,17 @@ static int hpp__width_ratio(struct perf_hpp_fmt *_fmt __maybe_unused,
static int hpp__entry_ratio(struct perf_hpp_fmt *_fmt __maybe_unused,
struct perf_hpp *hpp, struct hist_entry *he)
{
+ struct hist_entry *pair = hist_entry__next_pair(he);
const char *fmt = symbol_conf.field_sep ? "%s" : "%14s";
char buf[32] = " ";
- double ratio;
+ double ratio = 0.0;

- if (he->diff.computed)
- ratio = he->diff.period_ratio;
- else
- ratio = perf_diff__compute_ratio(he);
+ if (pair) {
+ if (he->diff.computed)
+ ratio = he->diff.period_ratio;
+ else
+ ratio = perf_diff__compute_ratio(he, pair);
+ }

if (ratio > 0.0)
scnprintf(buf, sizeof(buf), "%+14.6F", ratio);
@@ -378,14 +385,17 @@ static int hpp__width_wdiff(struct perf_hpp_fmt *fmt __maybe_unused,
static int hpp__entry_wdiff(struct perf_hpp_fmt *_fmt __maybe_unused,
struct perf_hpp *hpp, struct hist_entry *he)
{
+ struct hist_entry *pair = hist_entry__next_pair(he);
const char *fmt = symbol_conf.field_sep ? "%s" : "%14s";
char buf[32] = " ";
- s64 wdiff;
+ s64 wdiff = 0;

- if (he->diff.computed)
- wdiff = he->diff.wdiff;
- else
- wdiff = perf_diff__compute_wdiff(he);
+ if (pair) {
+ if (he->diff.computed)
+ wdiff = he->diff.wdiff;
+ else
+ wdiff = perf_diff__compute_wdiff(he, pair);
+ }

if (wdiff != 0)
scnprintf(buf, sizeof(buf), "%14ld", wdiff);
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index e899e2d..53a1679 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -228,8 +228,9 @@ int perf_evlist__gtk_browse_hists(struct perf_evlist *evlist __maybe_unused,

unsigned int hists__sort_list_width(struct hists *self);

-double perf_diff__compute_delta(struct hist_entry *he);
-double perf_diff__compute_ratio(struct hist_entry *he);
-s64 perf_diff__compute_wdiff(struct hist_entry *he);
+double perf_diff__compute_delta(struct hist_entry *he, struct hist_entry *pair);
+double perf_diff__compute_ratio(struct hist_entry *he, struct hist_entry *pair);
+s64 perf_diff__compute_wdiff(struct hist_entry *he, struct hist_entry *pair);
int perf_diff__formula(char *buf, size_t size, struct hist_entry *he);
+double perf_diff__period_percent(struct hist_entry *he, u64 period);
#endif /* __PERF_HIST_H */
--
1.7.11.7