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| author |   Pekka Paalanen <pq@iki.fi> | 2008-09-16 22:06:42 +0300 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-10-14 10:37:20 +0200 |
| commit | 5bf9a1ee350a10feb94107de32a203d81fbbe706 (patch) | |
| tree | ac6b11aaa35194aed9fe9f1403c9542d070d0c62 /Documentation/tracers | |
| parent | mmiotrace: remove left-over marker cruft (diff) | |
| download | linux-dev-5bf9a1ee350a10feb94107de32a203d81fbbe706.tar.xz linux-dev-5bf9a1ee350a10feb94107de32a203d81fbbe706.zip | |
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')
| -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 $ echo mmiotrace > /debug/tracing/current_tracer $ cat /debug/tracing/trace_pipe > mydump.txt & Start X or whatever. -$ echo "X is up" > /debug/tracing/marker +$ echo "X is up" > /debug/tracing/trace_marker $ echo none > /debug/tracing/current_tracer Check for lost events. @@ -59,9 +59,8 @@ The 'cat' process should stay running (sleeping) in the background. Load the driver you want to trace and use it. Mmiotrace will only catch MMIO accesses to areas that are ioremapped while mmiotrace is active. -[Unimplemented feature:] During tracing you can place comments (markers) into the trace by -$ echo "X is up" > /debug/tracing/marker +$ echo "X is up" > /debug/tracing/trace_marker This makes it easier to see which part of the (huge) trace corresponds to which action. It is recommended to place descriptive markers about what you do. |