[PATCH 07/12] perf diff: Add ratio computation way to compare hist entries
From: Jiri Olsa
Date: Thu Sep 06 2012 - 11:51:03 EST
Adding -c option to select computation method with the current
'Delta' computation as default. Current posible values are of
this option are: 'delta' and 'ratio'.
Adding 'ratio' as new computation way to compare hist entries.
If specified the 'Ratio' column is displayed with value 'r'
computed as:
r = A->period / B->period
with:
- A/B being matching hist entry from first/second file specified
(or perf.data/perf.data.old) respectively.
- period being the hist entry period value
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
tools/perf/Documentation/perf-diff.txt | 33 ++++++++++++++++++++++
tools/perf/builtin-diff.c | 51 +++++++++++++++++++++++++++++++++-
tools/perf/ui/stdio/hist.c | 13 +++++++++
tools/perf/util/hist.h | 1 +
4 files changed, 97 insertions(+), 1 deletion(-)
diff --git a/tools/perf/Documentation/perf-diff.txt b/tools/perf/Documentation/perf-diff.txt
index 6ce9585..8fff061 100644
--- a/tools/perf/Documentation/perf-diff.txt
+++ b/tools/perf/Documentation/perf-diff.txt
@@ -76,6 +76,39 @@ OPTIONS
--baseline-only::
Show only items with match in baseline.
+-c::
+--compute::
+ Differential computation selection - delta,ratio (default is delta).
+ See COMPARISON METHODS section for more info.
+
+COMPARISON METHODS
+------------------
+delta
+~~~~~
+If specified the 'Delta' column is displayed with value 'd' computed as:
+
+ d = A->period_percent - B->period_percent
+
+with:
+ - A/B being matching hist entry from first/second file specified
+ (or perf.data/perf.data.old) respectively.
+
+ - period_percent being the % of the hist entry period value within
+ single data file
+
+ratio
+~~~~~
+If specified the 'Ratio' column is displayed with value 'r' computed as:
+
+ r = A->period / B->period
+
+with:
+ - A/B being matching hist entry from first/second file specified
+ (or perf.data/perf.data.old) respectively.
+
+ - period being the hist entry period value
+
+
SEE ALSO
--------
linkperf:perf-record[1]
diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 46f4a10..cde08d4 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -27,6 +27,39 @@ static bool force;
static bool show_displacement;
static bool show_baseline_only;
+enum {
+ COMPUTE_DELTA,
+ COMPUTE_RATIO,
+ COMPUTE_MAX,
+};
+
+const char *compute_names[COMPUTE_MAX] = {
+ [COMPUTE_DELTA] = "delta",
+ [COMPUTE_RATIO] = "ratio",
+};
+
+static const char *compute_str;
+static int compute;
+
+static int setup_compute(void)
+{
+ unsigned i;
+
+ if (!compute_str) {
+ compute = COMPUTE_DELTA;
+ return 0;
+ }
+
+ for (i = 0; i < COMPUTE_MAX; i++)
+ if (!strcmp(compute_str, compute_names[i])) {
+ compute = i;
+ return 0;
+ }
+
+ pr_err("Failed to find valid compute string\n");
+ return -EINVAL;
+}
+
static int hists__add_entry(struct hists *self,
struct addr_location *al, u64 period)
{
@@ -263,6 +296,8 @@ static const struct option options[] = {
"Show position displacement relative to baseline"),
OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
"Show only items with match in baseline"),
+ OPT_STRING('c', "compute", &compute_str, "delta,ratio (default delta)",
+ "Entries differential computation selection"),
OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
"dump raw trace in ASCII"),
OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
@@ -288,7 +323,18 @@ static void setup_ui_stdio(void)
{
hists_stdio_column__register_idx(HISTC_BASELINE);
hists_stdio_column__register_global();
- hists_stdio_column__register_idx(HISTC_DELTA);
+
+ switch (compute) {
+ case COMPUTE_DELTA:
+ hists_stdio_column__register_idx(HISTC_DELTA);
+ break;
+ case COMPUTE_RATIO:
+ hists_stdio_column__register_idx(HISTC_RATIO);
+ break;
+ default:
+ BUG_ON(1);
+ };
+
if (show_displacement)
hists_stdio_column__register_idx(HISTC_DISPLACEMENT);
}
@@ -315,6 +361,9 @@ int cmd_diff(int argc, const char **argv, const char *prefix __used)
if (symbol__init() < 0)
return -1;
+ if (setup_compute())
+ usage_with_options(diff_usage, options);
+
setup_sorting(diff_usage, options);
setup_ui_stdio();
setup_pager();
diff --git a/tools/perf/ui/stdio/hist.c b/tools/perf/ui/stdio/hist.c
index 48fb0b3..02ba1c7 100644
--- a/tools/perf/ui/stdio/hist.c
+++ b/tools/perf/ui/stdio/hist.c
@@ -31,6 +31,18 @@ hists_stdio_column__delta_snprintf(struct hist_entry *he, char *bf,
}
static int
+hists_stdio_column__ratio_snprintf(struct hist_entry *he, char *bf,
+ size_t size, unsigned int width __used)
+{
+ struct hist_entry *pair = he->pair;
+ double new_period = he->period;
+ double old_period = pair ? pair->period : 0;
+ double ratio = pair ? new_period / old_period : 0;
+
+ return percent_color_snprintf(bf, size, "%14.3F", ratio);
+}
+
+static int
hists_stdio_column__baseline_snprintf(struct hist_entry *he, char *bf,
size_t size, unsigned int width __used)
{
@@ -124,6 +136,7 @@ DEF_COLUMN(cpu_guest_us, HISTC_CPU_UTILIZATION_GUEST_US, 8, "guest us")
DEF_COLUMN(nr_samples, HISTC_NR_SAMPLES, 12, "Samples")
DEF_COLUMN(total_period, HISTC_TOTAL_PERIOD, 12, "Period")
DEF_COLUMN(delta, HISTC_DELTA, 8, "Delta")
+DEF_COLUMN(ratio, HISTC_RATIO, 14, "Ratio")
DEF_COLUMN(displacement, HISTC_DISPLACEMENT, 5, "Displ")
};
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 36ff4c5..b24341d 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -46,6 +46,7 @@ enum hist_column {
HISTC_NR_SAMPLES,
HISTC_TOTAL_PERIOD,
HISTC_DELTA,
+ HISTC_RATIO,
HISTC_DISPLACEMENT,
/* sorted (hist_entry__sort_list) */
--
1.7.11.4
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