perf report: Support time percent and multiple time ranges

perf report has a --time option to limit the time range of output.  It
only supports absolute time.

Now this option is extended to support multiple time ranges and support
the percent of time.

For example:

1. Select the first and second 10% time slices:

perf report --time 10%/1,10%/2

2. Select from 0% to 10% and 30% to 40% slices:

perf report --time 0%-10%,30%-40%

Changelog:

v6: Fix the merge issue with latest perf/core branch.
    No functional changes.

v5: Add checking of first/last sample time to detect if it's recorded
    in perf.data. If it's not recorded, returns error message to user.

v4: Remove perf_time__skip_sample, only uses perf_time__ranges_skip_sample

v3: Since the definitions of first_sample_time/last_sample_time
    are moved from perf_session to perf_evlist so change the
    related code.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1512738826-2628-6-git-send-email-yao.jin@linux.intel.com
[ Add missing colons at end of examples in the man page ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index ddde2b54af572e2407c364cd6441aaba2742e43e..1e02c4e1a81f03629ab5e1c1ebf9507041d35d18 100644 (file)
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -402,6 +402,26 @@ OPTIONS
        stop time is not given (i.e, time string is 'x.y,') then analysis goes
        to end of file.
 
+       Also support time percent with multiple time range. Time string is
+       'a%/n,b%/m,...' or 'a%-b%,c%-%d,...'. The maximum number of slices is 10.
+
+       For example:
+       Select the second 10% time slice:
+
+         perf report --time 10%/2
+
+       Select from 0% to 10% time slice:
+
+         perf report --time 0%-10%
+
+       Select the first and second 10% time slices:
+
+         perf report --time 10%/1,10%/2
+
+       Select from 0% to 10% and 30% to 40% slices:
+
+         perf report --time 0%-10%,30%-40%
+
 --itrace::
        Options for decoding instruction tracing data. The options are:
 

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 07827cd5148039d02a3d7291c145a96876383eb3..770bf8a614f22fe89dfb93806f182c2cdf9f6b9f 100644 (file)
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -52,6 +52,8 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
+#define PTIME_RANGE_MAX        10
+
 struct report {
        struct perf_tool        tool;
        struct perf_session     *session;
@@ -69,7 +71,8 @@ struct report {
        const char              *cpu_list;
        const char              *symbol_filter_str;
        const char              *time_str;
-       struct perf_time_interval ptime;
+       struct perf_time_interval ptime_range[PTIME_RANGE_MAX];
+       int                     range_num;
        float                   min_percent;
        u64                     nr_entries;
        u64                     queue_size;
@@ -202,8 +205,10 @@ static int process_sample_event(struct perf_tool *tool,
        };
        int ret = 0;
 
-       if (perf_time__skip_sample(&rep->ptime, sample->time))
+       if (perf_time__ranges_skip_sample(rep->ptime_range, rep->range_num,
+                                         sample->time)) {
                return 0;
+       }
 
        if (machine__resolve(machine, &al, sample) < 0) {
                pr_debug("problem processing %d event, skipping it.\n",
@@ -1093,9 +1098,25 @@ repeat:
        if (symbol__init(&session->header.env) < 0)
                goto error;
 
-       if (perf_time__parse_str(&report.ptime, report.time_str) != 0) {
-               pr_err("Invalid time string\n");
-               return -EINVAL;
+       if (perf_time__parse_str(report.ptime_range, report.time_str) != 0) {
+               if (session->evlist->first_sample_time == 0 &&
+                   session->evlist->last_sample_time == 0) {
+                       pr_err("No first/last sample time in perf data\n");
+                       return -EINVAL;
+               }
+
+               report.range_num = perf_time__percent_parse_str(
+                                       report.ptime_range, PTIME_RANGE_MAX,
+                                       report.time_str,
+                                       session->evlist->first_sample_time,
+                                       session->evlist->last_sample_time);
+
+               if (report.range_num < 0) {
+                       pr_err("Invalid time string\n");
+                       return -EINVAL;
+               }
+       } else {
+               report.range_num = 1;
        }
 
        sort__setup_elide(stdout);