diff options
author | Pekka Paalanen <pq@iki.fi> | 2008-09-16 15:06:42 -0400 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2008-10-14 04:37:20 -0400 |
commit | 5bf9a1ee350a10feb94107de32a203d81fbbe706 (patch) | |
tree | ac6b11aaa35194aed9fe9f1403c9542d070d0c62 /Documentation/tracers/mmiotrace.txt | |
parent | 4427414170a63331a9cc36b9598502c5cdfe453b (diff) |
ftrace: inject markers via trace_marker file
Allow a user to inject a marker (TRACE_PRINT entry) into the trace ring
buffer. The related file operations are derived from code by Frédéric
Weisbecker <fweisbec@gmail.com>.
Signed-off-by: Pekka Paalanen <pq@iki.fi>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation/tracers/mmiotrace.txt')
-rw-r--r-- | Documentation/tracers/mmiotrace.txt | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/Documentation/tracers/mmiotrace.txt b/Documentation/tracers/mmiotrace.txt index a4afb560a45b..5bbbe2096223 100644 --- a/Documentation/tracers/mmiotrace.txt +++ b/Documentation/tracers/mmiotrace.txt | |||
@@ -36,7 +36,7 @@ $ mount -t debugfs debugfs /debug | |||
36 | $ echo mmiotrace > /debug/tracing/current_tracer | 36 | $ echo mmiotrace > /debug/tracing/current_tracer |
37 | $ cat /debug/tracing/trace_pipe > mydump.txt & | 37 | $ cat /debug/tracing/trace_pipe > mydump.txt & |
38 | Start X or whatever. | 38 | Start X or whatever. |
39 | $ echo "X is up" > /debug/tracing/marker | 39 | $ echo "X is up" > /debug/tracing/trace_marker |
40 | $ echo none > /debug/tracing/current_tracer | 40 | $ echo none > /debug/tracing/current_tracer |
41 | Check for lost events. | 41 | Check for lost events. |
42 | 42 | ||
@@ -59,9 +59,8 @@ The 'cat' process should stay running (sleeping) in the background. | |||
59 | Load the driver you want to trace and use it. Mmiotrace will only catch MMIO | 59 | Load the driver you want to trace and use it. Mmiotrace will only catch MMIO |
60 | accesses to areas that are ioremapped while mmiotrace is active. | 60 | accesses to areas that are ioremapped while mmiotrace is active. |
61 | 61 | ||
62 | [Unimplemented feature:] | ||
63 | During tracing you can place comments (markers) into the trace by | 62 | During tracing you can place comments (markers) into the trace by |
64 | $ echo "X is up" > /debug/tracing/marker | 63 | $ echo "X is up" > /debug/tracing/trace_marker |
65 | This makes it easier to see which part of the (huge) trace corresponds to | 64 | This makes it easier to see which part of the (huge) trace corresponds to |
66 | which action. It is recommended to place descriptive markers about what you | 65 | which action. It is recommended to place descriptive markers about what you |
67 | do. | 66 | do. |