From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx>
Add an option to trace-cmd show that displays the subbuffer size in
kilobytes.
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
---
Documentation/trace-cmd/trace-cmd-show.1.txt | 5 +++++
tracecmd/trace-show.c | 6 ++++++
tracecmd/trace-usage.c | 1 +
3 files changed, 12 insertions(+)
diff --git a/Documentation/trace-cmd/trace-cmd-show.1.txt b/Documentation/trace-cmd/trace-cmd-show.1.txt
index ea2fda285e18..ac40dacf7061 100644
--- a/Documentation/trace-cmd/trace-cmd-show.1.txt
+++ b/Documentation/trace-cmd/trace-cmd-show.1.txt
@@ -60,6 +60,11 @@ OPTIONS
*--buffer_total_size*::
Show the total size of all buffers.
+*--buffer_subbuf_size*::
+ Show the size in kilobytes of the sub-buffers of the ring buffer.
+ The ring buffer is broken up into equal size sub-buffers were an event can only
+ be as big as the sub-buffer data section (the size minus its meta data).
+
*--ftrace_filter*::
Show what function filters are set.
diff --git a/tracecmd/trace-show.c b/tracecmd/trace-show.c
index 796c587c0cd0..17eb098952f7 100644
--- a/tracecmd/trace-show.c
+++ b/tracecmd/trace-show.c
@@ -17,6 +17,7 @@ enum {
OPT_ftrace_pid,
OPT_ftrace_notrace,
OPT_ftrace_filter,
+ OPT_buffer_subbuf_size_kb,
OPT_buffer_total_size_kb,
OPT_buffer_size_kb,
OPT_current_tracer,
@@ -42,6 +43,7 @@ void trace_show(int argc, char **argv)
{"current_tracer", no_argument, NULL, OPT_current_tracer},
{"buffer_size", no_argument, NULL, OPT_buffer_size_kb},
{"buffer_total_size", no_argument, NULL, OPT_buffer_total_size_kb},
+ {"buffer_subbuf_size", no_argument, NULL, OPT_buffer_subbuf_size_kb},
{"ftrace_filter", no_argument, NULL, OPT_ftrace_filter},
{"ftrace_notrace", no_argument, NULL, OPT_ftrace_notrace},
{"ftrace_pid", no_argument, NULL, OPT_ftrace_pid},
@@ -102,6 +104,10 @@ void trace_show(int argc, char **argv)
show_instance_file(instance, "buffer_total_size_kb");
stop = 1;
break;
+ case OPT_buffer_subbuf_size_kb:
+ show_instance_file(instance, "buffer_subbuf_size_kb");
+ stop = 1;
+ break;
case OPT_ftrace_filter:
show_instance_file(instance, "set_ftrace_filter");
stop = 1;
diff --git a/tracecmd/trace-usage.c b/tracecmd/trace-usage.c
index 37d576b009ac..7dc9b1871398 100644
--- a/tracecmd/trace-usage.c
+++ b/tracecmd/trace-usage.c
@@ -180,6 +180,7 @@ static struct usage_help usage_help[] = {
" --current_tracer\n"
" --buffer_size (for buffer_size_kb)\n"
" --buffer_total_size (for buffer_total_size_kb)\n"
+ " --buffer_subbuf_size (for buffer_subbuf_size_kb)\n"
" --ftrace_filter (for set_ftrace_filter)\n"
" --ftrace_notrace (for set_ftrace_notrace)\n"
" --ftrace_pid (for set_ftrace_pid)\n"
--
2.42.0
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