The --percentage option is for controlling overhead percentage
displayed. It can only receive either of "relative" or "absolute" and
affects -c delta output only.
For more information, please see previous commit same thing done to
"perf report".
Cc: Jiri Olsa <jo...@redhat.com>
Signed-off-by: Namhyung Kim <namhy...@kernel.org>
---
tools/perf/Documentation/perf-diff.txt | 21 +++++++++++++---
tools/perf/builtin-diff.c | 46 +++++++++++++++++++++++++++++-----
2 files changed, 58 insertions(+), 9 deletions(-)
diff --git a/tools/perf/Documentation/perf-diff.txt
b/tools/perf/Documentation/perf-diff.txt
index fdfceee0ffd0..fbfa1192923c 100644
--- a/tools/perf/Documentation/perf-diff.txt
+++ b/tools/perf/Documentation/perf-diff.txt
@@ -33,17 +33,20 @@ OPTIONS
-d::
--dsos=::
Only consider symbols in these dsos. CSV that understands
- file://filename entries.
+ file://filename entries. This option will affect the percentage
+ of the Baseline/Delta column. See --percentage for more info.
-C::
--comms=::
Only consider symbols in these comms. CSV that understands
- file://filename entries.
+ file://filename entries. This option will affect the percentage
+ of the Baseline/Delta column. See --percentage for more info.
-S::
--symbols=::
Only consider these symbols. CSV that understands
- file://filename entries.
+ file://filename entries. This option will affect the percentage
+ of the Baseline/Delta column. See --percentage for more info.
-s::
--sort=::
@@ -89,6 +92,14 @@ OPTIONS
--order::
Specify compute sorting column number.
+--percentage::
+ Determine how to display the overhead percentage of filtered entries.
+ Filters can be applied by --comms, --dsos and/or --symbols options.
+
+ "relative" means it's relative to filtered entries only so that the
+ sum of shown entries will be always 100%. "absolute" means it retains
+ the original value before and after the filter is applied.
+
COMPARISON
----------
The comparison is governed by the baseline file. The baseline perf.data
@@ -157,6 +168,10 @@ with:
- period_percent being the % of the hist entry period value within
single data file
+ - with filtering by -C, -d and/or -S, period_percent might be changed
+ relative to how entries are filtered. Use --percentage=absolute to
+ prevent such fluctuation.
+
ratio
~~~~~
If specified the 'Ratio' column is displayed with value 'r' computed as:
diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index a77e31246c00..2c7406d9eb5d 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -221,6 +221,10 @@ static int setup_compute(const struct option *opt, const
char *str,
static double period_percent(struct hist_entry *he, u64 period)
{
u64 total = he->hists->stats.total_period;
+
+ if (symbol_conf.filter_relative)
+ total = he->hists->stats.total_filtered_period;
+
return (period * 100.0) / total;
}
@@ -259,11 +263,18 @@ static s64 compute_wdiff(struct hist_entry *he, struct
hist_entry *pair)
static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
char *buf, size_t size)
{
+ u64 he_total = he->hists->stats.total_period;
+ u64 pair_total = pair->hists->stats.total_period;
+
+ if (symbol_conf.filter_relative) {
+ he_total = he->hists->stats.total_filtered_period;
+ pair_total = pair->hists->stats.total_filtered_period;
+ }
return scnprintf(buf, size,
"(%" PRIu64 " * 100 / %" PRIu64 ") - "
"(%" PRIu64 " * 100 / %" PRIu64 ")",
- pair->stat.period, pair->hists->stats.total_period,
- he->stat.period, he->hists->stats.total_period);
+ pair->stat.period, pair_total,
+ he->stat.period, he_total);
}
static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
@@ -327,15 +338,16 @@ static int diff__process_sample_event(struct perf_tool
*tool __maybe_unused,
return -1;
}
- if (al.filtered)
- return 0;
-
if (hists__add_entry(&evsel->hists, &al, sample->period,
sample->weight, sample->transaction)) {
pr_warning("problem incrementing symbol period, skipping
event\n");
return -1;
}
+ if (al.filtered == 0) {
+ evsel->hists.stats.total_filtered_period += sample->period;
+ evsel->hists.nr_filtered_entries++;
+ }
evsel->hists.stats.total_period += sample->period;
return 0;
}
@@ -565,7 +577,9 @@ static void hists__compute_resort(struct hists *hists)
next = rb_first(root);
hists->nr_entries = 0;
+ hists->nr_filtered_entries = 0;
hists->stats.total_period = 0;
+ hists->stats.total_filtered_period = 0;
hists__reset_col_len(hists);
while (next != NULL) {
@@ -695,6 +709,19 @@ static int __cmd_diff(void)
return ret;
}
+static int parse_percentage(const struct option *opt __maybe_unused,
+ const char *arg, int unset __maybe_unused)
+{
+ if (!strcmp(arg, "relative"))
+ symbol_conf.filter_relative = true;
+ else if (!strcmp(arg, "absolute"))
+ symbol_conf.filter_relative = false;
+ else
+ return -1;
+
+ return 0;
+}
+
static const char * const diff_usage[] = {
"perf diff [<options>] [old_file] [new_file]",
NULL,
@@ -732,13 +759,20 @@ static const struct option options[] = {
OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
"Look for files with symbols relative to this directory"),
OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
+ OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
+ "How to display percentage of filtered entries",
parse_percentage),
OPT_END()
};
static double baseline_percent(struct hist_entry *he)
{
struct hists *hists = he->hists;
- return 100.0 * he->stat.period / hists->stats.total_period;
+ u64 total = hists->stats.total_period;
+
+ if (symbol_conf.filter_relative)
+ total = hists->stats.total_filtered_period;
+
+ return 100.0 * he->stat.period / total;
}
static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
--
1.7.11.7
--
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