Re: [PATCH v8 05/18] perf ftrace: show trace column header
Em Fri, Aug 14, 2020 at 08:56:55AM -0300, Arnaldo Carvalho de Melo escreveu: > Em Sat, Aug 08, 2020 at 10:31:28AM +0800, Changbin Du escreveu: > > This makes perf-ftrace display column header before printing trace. > > > > $ sudo perf ftrace > > # tracer: function > > # > > # entries-in-buffer/entries-written: 0/0 #P:8 > > # > > #TASK-PID CPU# TIMESTAMP FUNCTION > > # | | | | | > > <...>-9246 [006] 10726.262760: mutex_unlock <-rb_simple_write > > <...>-9246 [006] 10726.262764: __fsnotify_parent <-vfs_write > > <...>-9246 [006] 10726.262765: fsnotify <-vfs_write > > <...>-9246 [006] 10726.262766: __sb_end_write <-vfs_write > > <...>-9246 [006] 10726.262767: > > fpregs_assert_state_consistent <-do_syscall_64 > > We have: > > # perf report -h header > >Usage: perf report [] > > --header Show data header. > --header-only Show only data header. > > # > > So perhaps we should have those as well, in the 'ftrace' case one would > perhaps want to use --no-header, for instance, to do some scripting > parsing just the trace lines. This as well can be done after I process this series, to make progress. Applied. - Arnaldo
Re: [PATCH v8 05/18] perf ftrace: show trace column header
Em Sat, Aug 08, 2020 at 10:31:28AM +0800, Changbin Du escreveu: > This makes perf-ftrace display column header before printing trace. > > $ sudo perf ftrace > # tracer: function > # > # entries-in-buffer/entries-written: 0/0 #P:8 > # > #TASK-PID CPU# TIMESTAMP FUNCTION > # | | | | | > <...>-9246 [006] 10726.262760: mutex_unlock <-rb_simple_write > <...>-9246 [006] 10726.262764: __fsnotify_parent <-vfs_write > <...>-9246 [006] 10726.262765: fsnotify <-vfs_write > <...>-9246 [006] 10726.262766: __sb_end_write <-vfs_write > <...>-9246 [006] 10726.262767: fpregs_assert_state_consistent > <-do_syscall_64 We have: # perf report -h header Usage: perf report [] --header Show data header. --header-only Show only data header. # So perhaps we should have those as well, in the 'ftrace' case one would perhaps want to use --no-header, for instance, to do some scripting parsing just the trace lines. - Arnaldo > Signed-off-by: Changbin Du > --- > tools/perf/builtin-ftrace.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c > index a3a4f4be9dde..39c694be2b71 100644 > --- a/tools/perf/builtin-ftrace.c > +++ b/tools/perf/builtin-ftrace.c > @@ -435,6 +435,9 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int > argc, const char **argv) > fcntl(trace_fd, F_SETFL, O_NONBLOCK); > pollfd.fd = trace_fd; > > + /* display column headers */ > + read_tracing_file_to_stdout("trace"); > + > if (write_tracing_file("tracing_on", "1") < 0) { > pr_err("can't enable tracing\n"); > goto out_close_fd; > -- > 2.25.1 > -- - Arnaldo
[PATCH v8 05/18] perf ftrace: show trace column header
This makes perf-ftrace display column header before printing trace. $ sudo perf ftrace # tracer: function # # entries-in-buffer/entries-written: 0/0 #P:8 # #TASK-PID CPU# TIMESTAMP FUNCTION # | | | | | <...>-9246 [006] 10726.262760: mutex_unlock <-rb_simple_write <...>-9246 [006] 10726.262764: __fsnotify_parent <-vfs_write <...>-9246 [006] 10726.262765: fsnotify <-vfs_write <...>-9246 [006] 10726.262766: __sb_end_write <-vfs_write <...>-9246 [006] 10726.262767: fpregs_assert_state_consistent <-do_syscall_64 Signed-off-by: Changbin Du --- tools/perf/builtin-ftrace.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index a3a4f4be9dde..39c694be2b71 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -435,6 +435,9 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) fcntl(trace_fd, F_SETFL, O_NONBLOCK); pollfd.fd = trace_fd; + /* display column headers */ + read_tracing_file_to_stdout("trace"); + if (write_tracing_file("tracing_on", "1") < 0) { pr_err("can't enable tracing\n"); goto out_close_fd; -- 2.25.1