perf record: Record the first and last sample time in the header

In the default 'perf record' configuration, all samples are processed,
to create the HEADER_BUILD_ID table. So it's very easy to get the
first/last samples and save the time to perf file header via the
function write_sample_time().

Later, at post processing time, perf report/script will fetch the time
from perf file header.

Committer testing:

  # perf record -a sleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 2.099 MB perf.data (1101 samples) ]
  [root@jouet home]# perf report --header | grep "time of "
  # time of first sample : 22947.909226
  # time of last sample : 22948.910704
  #
  # perf report -D | grep PERF_RECORD_SAMPLE\(
  0 22947909226101 0x20bb68 [0x30]: PERF_RECORD_SAMPLE(IP, 0x4001): 0/0: 0xffffffffa21b1af3 period: 1 addr: 0
  0 22947909229928 0x20bb98 [0x30]: PERF_RECORD_SAMPLE(IP, 0x4001): 0/0: 0xffffffffa200d204 period: 1 addr: 0
  <SNIP>
  3 22948910397351 0x219360 [0x30]: PERF_RECORD_SAMPLE(IP, 0x4001): 28251/28251: 0xffffffffa22071d8 period: 169518 addr: 0
  0 22948910652380 0x20f120 [0x30]: PERF_RECORD_SAMPLE(IP, 0x4001): 0/0: 0xffffffffa2856816 period: 198807 addr: 0
  2 22948910704034 0x2172d0 [0x30]: PERF_RECORD_SAMPLE(IP, 0x4001): 0/0: 0xffffffffa2856816 period: 88111 addr: 0
  #

Changelog:

v7: Just update the patch description according to Arnaldo's suggestion.

v6: Currently '--buildid-all' is not enabled at default. So the walking
    on all samples is the default operation. There is no big overhead
    to calculate the timestamp boundary in process_sample_event handler
    once we already go through all samples. So the timestamp boundary
    calculation is enabled by default when '--buildid-all' is not enabled.

    While if '--buildid-all' is enabled, we creates a new option
    "--timestamp-boundary" for user to decide if it enables the
    timestamp boundary calculation.

v5: There is an issue that the sample walking can only work when
    '--buildid-all' is not enabled. So we need to let the walking
    be able to work even if '--buildid-all' is enabled and let the
    processing skips the dso hit marking for this case.

    At first, I want to provide a new option "--record-time-boundaries".
    While after consideration, I think a new option is not very
    necessary.

v3: Remove the definitions of first_sample_time and last_sample_time
    from struct record and directly save them in perf_evlist.

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/1512738826-2628-3-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 5a626ef..3eea6de 100644 (file)
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -430,6 +430,9 @@ Configure all used events to run in user space.
 --timestamp-filename
 Append timestamp to output file name.
 
+--timestamp-boundary::
+Record timestamp boundary (time of first/last samples).
+
 --switch-output[=mode]::
 Generate multiple perf.data files, timestamp prefixed, switching to a new one
 based on 'mode' value:

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 50385d8..65681a1 100644 (file)
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -78,6 +78,7 @@ struct record {
        bool                    no_buildid_cache_set;
        bool                    buildid_all;
        bool                    timestamp_filename;
+       bool                    timestamp_boundary;
        struct switch_output    switch_output;
        unsigned long long      samples;
 };
@@ -409,8 +410,15 @@ static int process_sample_event(struct perf_tool *tool,
 {
        struct record *rec = container_of(tool, struct record, tool);
 
-       rec->samples++;
+       if (rec->evlist->first_sample_time == 0)
+               rec->evlist->first_sample_time = sample->time;
+
+       rec->evlist->last_sample_time = sample->time;
 
+       if (rec->buildid_all)
+               return 0;
+
+       rec->samples++;
        return build_id__mark_dso_hit(tool, event, sample, evsel, machine);
 }
 
@@ -435,9 +443,11 @@ static int process_buildids(struct record *rec)
 
        /*
         * If --buildid-all is given, it marks all DSO regardless of hits,
-        * so no need to process samples.
+        * so no need to process samples. But if timestamp_boundary is enabled,
+        * it still needs to walk on all samples to get the timestamps of
+        * first/last samples.
         */
-       if (rec->buildid_all)
+       if (rec->buildid_all && !rec->timestamp_boundary)
                rec->tool.sample = NULL;
 
        return perf_session__process_events(session);
@@ -1621,6 +1631,8 @@ static struct option __record_options[] = {
                    "Record build-id of all DSOs regardless of hits"),
        OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
                    "append timestamp to output filename"),
+       OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
+                   "Record timestamp boundary (time of first/last samples)"),
        OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str,
                          &record.switch_output.set, "signal,size,time",
                          "Switch output when receive SIGUSR2 or cross size,time threshold",