From: Steven Rostedt <rostedt@goodmis.org>
To: linux-trace-devel@vger.kernel.org
Cc: "Steven Rostedt (Google)" <rostedt@goodmis.org>
Subject: [PATCH 3/4] trace-cmd show: Add option to read buffer_percent
Date: Thu, 28 Dec 2023 22:16:46 -0500 [thread overview]
Message-ID: <20231229031907.69432-4-rostedt@goodmis.org> (raw)
In-Reply-To: <20231229031907.69432-1-rostedt@goodmis.org>
From: "Steven Rostedt (Google)" <rostedt@goodmis.org>
Add trace-cmd show --buffer_percent to show the value of the buffer_percent
file.
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
Documentation/trace-cmd/trace-cmd-show.1.txt | 8 ++++++++
tracecmd/trace-show.c | 6 ++++++
tracecmd/trace-usage.c | 1 +
3 files changed, 15 insertions(+)
diff --git a/Documentation/trace-cmd/trace-cmd-show.1.txt b/Documentation/trace-cmd/trace-cmd-show.1.txt
index ac40dacf7061..f85c070b0598 100644
--- a/Documentation/trace-cmd/trace-cmd-show.1.txt
+++ b/Documentation/trace-cmd/trace-cmd-show.1.txt
@@ -65,6 +65,14 @@ OPTIONS
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).
+*--buffer_percent*::
+ Show the percentage the buffer must be filled before a reader that is blocked
+ on the trace_pipe_raw file will be woken up.
+
+ 0 : wake up immediately on any new data
+ 1 - 99 : wake up on this percentage of the sub-buffers being full
+ 100 : wake up after the buffer is full and the writer is on the last sub-buffer
+
*--ftrace_filter*::
Show what function filters are set.
diff --git a/tracecmd/trace-show.c b/tracecmd/trace-show.c
index 17eb098952f7..d91362e47c50 100644
--- a/tracecmd/trace-show.c
+++ b/tracecmd/trace-show.c
@@ -20,6 +20,7 @@ enum {
OPT_buffer_subbuf_size_kb,
OPT_buffer_total_size_kb,
OPT_buffer_size_kb,
+ OPT_buffer_percent,
OPT_current_tracer,
OPT_tracing_on,
};
@@ -44,6 +45,7 @@ void trace_show(int argc, char **argv)
{"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},
+ {"buffer_percent", no_argument, NULL, OPT_buffer_percent},
{"ftrace_filter", no_argument, NULL, OPT_ftrace_filter},
{"ftrace_notrace", no_argument, NULL, OPT_ftrace_notrace},
{"ftrace_pid", no_argument, NULL, OPT_ftrace_pid},
@@ -108,6 +110,10 @@ void trace_show(int argc, char **argv)
show_instance_file(instance, "buffer_subbuf_size_kb");
stop = 1;
break;
+ case OPT_buffer_percent:
+ show_instance_file(instance, "buffer_percent");
+ 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 7dc9b1871398..3e5456d27e3d 100644
--- a/tracecmd/trace-usage.c
+++ b/tracecmd/trace-usage.c
@@ -181,6 +181,7 @@ static struct usage_help usage_help[] = {
" --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"
+ " --buffer_percent (for buffer_percent)\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
next prev parent reply other threads:[~2023-12-29 3:18 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-29 3:16 [PATCH 0/4] trace-cmd: Add ways to read more tracefs files Steven Rostedt
2023-12-29 3:16 ` [PATCH 1/4] trace-cmd show: Re-arrange the enum long option values Steven Rostedt
2023-12-29 3:16 ` [PATCH 2/4] trace-cmd show: Add --buffer-subbuf-size option Steven Rostedt
2023-12-29 3:16 ` Steven Rostedt [this message]
2023-12-29 3:16 ` [PATCH 4/4] trace-cmd stat: Use tracefs_instance_file_read() Steven Rostedt
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