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Subject[PATCH] perf: ftrace: flush output after each writing
Date
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>
---
tools/perf/builtin-ftrace.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 810e3376c7d6..ad2a9ae041f6 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -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);
}
}

--
2.25.1
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