diff --git a/tools/perf/Documentation/perf-diff.txt b/tools/perf/Documentation/perf-diff.txt
index a79c84ae61aaf616b931385c31969911d1d530bd..036d65bded51727599dcee6da3328e41ac174831 100644
--- a/tools/perf/Documentation/perf-diff.txt
+++ b/tools/perf/Documentation/perf-diff.txt
@@ -118,6 +118,51 @@ OPTIONS
sum of shown entries will be always 100%. "absolute" means it retains
the original value before and after the filter is applied.
+--time::
+ Analyze samples within given time window. It supports time
+ percent with multiple time ranges. Time string is 'a%/n,b%/m,...'
+ or 'a%-b%,c%-%d,...'.
+
+ For example:
+
+ Select the second 10% time slice to diff:
+
+ perf diff --time 10%/2
+
+ Select from 0% to 10% time slice to diff:
+
+ perf diff --time 0%-10%
+
+ Select the first and the second 10% time slices to diff:
+
+ perf diff --time 10%/1,10%/2
+
+ Select from 0% to 10% and 30% to 40% slices to diff:
+
+ perf diff --time 0%-10%,30%-40%
+
+ It also supports analyzing samples within a given time window
+ <start>,<stop>. Times have the format seconds.microseconds. If 'start'
+ is not given (i.e., time string is ',x.y') then analysis starts at
+ the beginning of the file. If stop time is not given (i.e, time
+ string is 'x.y,') then analysis goes to the end of the file. Time string is
+ 'a1.b1,c1.d1:a2.b2,c2.d2'. Use ':' to separate timestamps for different
+ perf.data files.
+
+ For example, we get the timestamp information from 'perf script'.
+
+ perf script -i perf.data.old
+ mgen 13940 [000] 3946.361400: ...
+
+ perf script -i perf.data
+ mgen 13940 [000] 3971.150589 ...
+
+ perf diff --time 3946.361400,:3971.150589,
+
+ It analyzes the perf.data.old from the timestamp 3946.361400 to
+ the end of perf.data.old and analyzes the perf.data from the
+ timestamp 3971.150589 to the end of perf.data.
+
COMPARISON
----------
The comparison is governed by the baseline file. The baseline perf.data
diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 58fe0e88215c058b920299d552881c54c878f89e..17cd898074c8944d9e40fc47d31d03cf2e44d833 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -19,12 +19,21 @@
#include "util/util.h"
#include "util/data.h"
#include "util/config.h"
+#include "util/time-utils.h"
#include <errno.h>
#include <inttypes.h>
#include <stdlib.h>
#include <math.h>
+struct perf_diff {
+ struct perf_tool tool;
+ const char *time_str;
+ struct perf_time_interval *ptime_range;
+ int range_size;
+ int range_num;
+};
+
/* Diff command specific HPP columns. */
enum {
PERF_HPP_DIFF__BASELINE,
@@ -323,16 +332,22 @@ static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,
return -1;
}
-static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
+static int diff__process_sample_event(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct perf_evsel *evsel,
struct machine *machine)
{
+ struct perf_diff *pdiff = container_of(tool, struct perf_diff, tool);
struct addr_location al;
struct hists *hists = evsel__hists(evsel);
int ret = -1;
+ if (perf_time__ranges_skip_sample(pdiff->ptime_range, pdiff->range_num,
+ sample->time)) {
+ return 0;
+ }
+
if (machine__resolve(machine, &al, sample) < 0) {
pr_warning("problem processing %d event, skipping it.\n",
event->header.type);
@@ -359,17 +374,19 @@ static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
return ret;
}
-static struct perf_tool tool = {
- .sample = diff__process_sample_event,
- .mmap = perf_event__process_mmap,
- .mmap2 = perf_event__process_mmap2,
- .comm = perf_event__process_comm,
- .exit = perf_event__process_exit,
- .fork = perf_event__process_fork,
- .lost = perf_event__process_lost,
- .namespaces = perf_event__process_namespaces,
- .ordered_events = true,
- .ordering_requires_timestamps = true,
+static struct perf_diff pdiff = {
+ .tool = {
+ .sample = diff__process_sample_event,
+ .mmap = perf_event__process_mmap,
+ .mmap2 = perf_event__process_mmap2,
+ .comm = perf_event__process_comm,
+ .exit = perf_event__process_exit,
+ .fork = perf_event__process_fork,
+ .lost = perf_event__process_lost,
+ .namespaces = perf_event__process_namespaces,
+ .ordered_events = true,
+ .ordering_requires_timestamps = true,
+ },
};
static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
@@ -771,19 +788,110 @@ static void data__free(struct data__file *d)
}
}
+static int abstime_str_dup(char **pstr)
+{
+ char *str = NULL;
+
+ if (pdiff.time_str && strchr(pdiff.time_str, ':')) {
+ str = strdup(pdiff.time_str);
+ if (!str)
+ return -ENOMEM;
+ }
+
+ *pstr = str;
+ return 0;
+}
+
+static int parse_absolute_time(struct data__file *d, char **pstr)
+{
+ char *p = *pstr;
+ int ret;
+
+ /*
+ * Absolute timestamp for one file has the format: a.b,c.d
+ * For multiple files, the format is: a.b,c.d:a.b,c.d
+ */
+ p = strchr(*pstr, ':');
+ if (p) {
+ if (p == *pstr) {
+ pr_err("Invalid time string\n");
+ return -EINVAL;
+ }
+
+ *p = 0;
+ p++;
+ if (*p == 0) {
+ pr_err("Invalid time string\n");
+ return -EINVAL;
+ }
+ }
+
+ ret = perf_time__parse_for_ranges(*pstr, d->session,
+ &pdiff.ptime_range,
+ &pdiff.range_size,
+ &pdiff.range_num);
+ if (ret < 0)
+ return ret;
+
+ if (!p || *p == 0)
+ *pstr = NULL;
+ else
+ *pstr = p;
+
+ return ret;
+}
+
+static int parse_percent_time(struct data__file *d)
+{
+ int ret;
+
+ ret = perf_time__parse_for_ranges(pdiff.time_str, d->session,
+ &pdiff.ptime_range,
+ &pdiff.range_size,
+ &pdiff.range_num);
+ return ret;
+}
+
+static int parse_time_str(struct data__file *d, char *abstime_ostr,
+ char **pabstime_tmp)
+{
+ int ret = 0;
+
+ if (abstime_ostr)
+ ret = parse_absolute_time(d, pabstime_tmp);
+ else if (pdiff.time_str)
+ ret = parse_percent_time(d);
+
+ return ret;
+}
+
static int __cmd_diff(void)
{
struct data__file *d;
- int ret = -EINVAL, i;
+ int ret, i;
+ char *abstime_ostr, *abstime_tmp;
+
+ ret = abstime_str_dup(&abstime_ostr);
+ if (ret)
+ return ret;
+
+ abstime_tmp = abstime_ostr;
+ ret = -EINVAL;
data__for_each_file(i, d) {
- d->session = perf_session__new(&d->data, false, &tool);
+ d->session = perf_session__new(&d->data, false, &pdiff.tool);
if (!d->session) {
pr_err("Failed to open %s\n", d->data.path);
ret = -1;
goto out_delete;
}
+ if (pdiff.time_str) {
+ ret = parse_time_str(d, abstime_ostr, &abstime_tmp);
+ if (ret < 0)
+ goto out_delete;
+ }
+
ret = perf_session__process_events(d->session);
if (ret) {
pr_err("Failed to process %s\n", d->data.path);
@@ -791,6 +899,9 @@ static int __cmd_diff(void)
}
perf_evlist__collapse_resort(d->session->evlist);
+
+ if (pdiff.ptime_range)
+ zfree(&pdiff.ptime_range);
}
data_process();
@@ -802,6 +913,13 @@ static int __cmd_diff(void)
}
free(data__files);
+
+ if (pdiff.ptime_range)
+ zfree(&pdiff.ptime_range);
+
+ if (abstime_ostr)
+ free(abstime_ostr);
+
return ret;
}
@@ -849,6 +967,8 @@ static const struct option options[] = {
OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
"How to display percentage of filtered entries", parse_filter_percentage),
+ OPT_STRING(0, "time", &pdiff.time_str, "str",
+ "Time span (time percent or absolute timestamp)"),
OPT_END()
};