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perf record: Generate tracking events for process forked by perf 

With 'perf record --switch-output' without -a, record__synthesize() in
record__switch_output() won't generate tracking events because there's
no thread_map in evlist. Which causes newly created perf.data doesn't
contain map and comm information.

This patch creates a fake thread_map and directly call
perf_event__synthesize_thread_map() for those events.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1461178794-40467-8-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
hifive-unleashed-5.1
Wang Nan 2016-04-20 18:59:54 +00:00 committed by Arnaldo Carvalho de Melo
parent 0c1d46a879
commit be7b0c9e37
1 changed files with 30 additions and 1 deletions
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31
tools/perf/builtin-record.c
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@ -500,6 +500,23 @@ record__finish_output(struct record *rec)
return;
}
static int record__synthesize_workload(struct record *rec)
{
struct {
struct thread_map map;
struct thread_map_data map_data;
} thread_map;
thread_map.map.nr = 1;
thread_map.map.map[0].pid = rec->evlist->workload.pid;
thread_map.map.map[0].comm = NULL;
return perf_event__synthesize_thread_map(&rec->tool, &thread_map.map,
process_synthesized_event,
&rec->session->machines.host,
rec->opts.sample_address,
rec->opts.proc_map_timeout);
}
static int record__synthesize(struct record *rec);
static int
@ -532,9 +549,21 @@ record__switch_output(struct record *rec, bool at_exit)
file->path, timestamp);
/* Output tracking events */
if (!at_exit)
if (!at_exit) {
record__synthesize(rec);
/*
* In 'perf record --switch-output' without -a,
* record__synthesize() in record__switch_output() won't
* generate tracking events because there's no thread_map
* in evlist. Which causes newly created perf.data doesn't
* contain map and comm information.
* Create a fake thread_map and directly call
* perf_event__synthesize_thread_map() for those events.
*/
if (target__none(&rec->opts.target))
record__synthesize_workload(rec);
}
return fd;
}