Messages in this thread Patch in this message | | | Date | Tue, 20 Jun 2017 02:05:53 -0700 | From | tip-bot for Namhyung Kim <> | Subject | [tip:perf/core] perf ftrace: Move setup_pager before opening trace_pipe |
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Commit-ID: 29681bc5bb4326c2f9eac5dc68d8fad3e88b4bb5 Gitweb: http://git.kernel.org/tip/29681bc5bb4326c2f9eac5dc68d8fad3e88b4bb5 Author: Namhyung Kim <namhyung@kernel.org> AuthorDate: Sun, 18 Jun 2017 23:23:00 +0900 Committer: Arnaldo Carvalho de Melo <acme@redhat.com> CommitDate: Mon, 19 Jun 2017 22:05:52 -0300
perf ftrace: Move setup_pager before opening trace_pipe
The 'perf ftrace' command fails to reset tracer after finishing recording like below:
$ sudo perf ftrace -v hello write 'nop' to tracing/current_tracer failed: Device or resource busy ...
This is because the trace_pipe file is open in pager process. Move the pager setup to before opening the file.
Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: kernel-team@lge.com Fixes: 583359646fde ("perf ftrace: Use pager for displaying result") Link: http://lkml.kernel.org/r/20170618142302.25390-2-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/builtin-ftrace.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index 966a94f..982b98e 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -231,6 +231,8 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) goto out_reset; } + setup_pager(); + trace_file = get_tracing_file("trace_pipe"); if (!trace_file) { pr_err("failed to open trace_pipe\n"); @@ -254,8 +256,6 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) goto out_close_fd; } - setup_pager(); - perf_evlist__start_workload(ftrace->evlist); while (!done) {
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