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perf evlist: Support pipe mode display 

Likewise, perf evlist command should print event attributes by reading
PERF_RECORD_HEADER_ATTR records.

Before:
  $ perf record -o- true | ./perf evlist -i-
  (prints nothing)

After:
  $ perf record -o- true | ./perf evlist -i-
  cycles:pppH

Committer testing:

Verbose mode also works as expected:

  $ perf record -o- true | perf evlist -i-
  cycles:uhH
  $ perf record -o- true | perf evlist -vi-
  cycles:uhH: size: 120, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|ID|PERIOD, read_format: ID, disabled: 1, inherit: 1, exclude_kernel: 1, mmap: 1, comm: 1, freq: 1, enable_on_exec: 1, task: 1, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1, ksymbol: 1, bpf_event: 1
  $

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20201210061302.88213-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2020-12-10 15:13:02 +09:00 committed by Arnaldo Carvalho de Melo
parent 03de8656c7
commit 96aea4daa6
1 changed files with 17 additions and 1 deletions
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18
tools/perf/builtin-evlist.c
View File

@ -17,6 +17,14 @@
#include "util/data.h"
#include "util/debug.h"
#include <linux/err.h>
#include "util/tool.h"
static int process_header_feature(struct perf_session *session __maybe_unused,
union perf_event *event __maybe_unused)
{
session_done = 1;
return 0;
}
static int __cmd_evlist(const char *file_name, struct perf_attr_details *details)
{
@ -27,12 +35,20 @@ static int __cmd_evlist(const char *file_name, struct perf_attr_details *details
.mode = PERF_DATA_MODE_READ,
.force = details->force,
};
struct perf_tool tool = {
/* only needed for pipe mode */
.attr = perf_event__process_attr,
.feature = process_header_feature,
};
bool has_tracepoint = false;
session = perf_session__new(&data, 0, NULL);
session = perf_session__new(&data, 0, &tool);
if (IS_ERR(session))
return PTR_ERR(session);
if (data.is_pipe)
perf_session__process_events(session);
evlist__for_each_entry(session->evlist, pos) {
evsel__fprintf(pos, details, stdout);