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perf ftrace: Flush output after each writing

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The pager will result stdout in full buffering mode instead of line
buffering. We need to make the trace visible timely.

Signed-off-by: Changbin Du <changbin.du@huawei.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230513074000.733550-1-changbin.du@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Changbin Du 2023-05-13 15:40:00 +08:00 committed by Arnaldo Carvalho de Melo
parent 6d491b37e7
commit 40bf1cb07e
1 changed files with 2 additions and 0 deletions
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2
tools/perf/builtin-ftrace.c
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@ -650,6 +650,8 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace)
break;
if (fwrite(buf, n, 1, stdout) != 1)
break;
/* flush output since stdout is in full buffering mode due to pager */
fflush(stdout);
}
}