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authorPekka Paalanen <pq@iki.fi>2008-09-16 22:06:42 +0300
committerIngo Molnar <mingo@elte.hu>2008-10-14 10:37:20 +0200
commit5bf9a1ee350a10feb94107de32a203d81fbbe706 (patch)
treeac6b11aaa35194aed9fe9f1403c9542d070d0c62 /Documentation/tracers
parent4427414170a63331a9cc36b9598502c5cdfe453b (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')
-rw-r--r--Documentation/tracers/mmiotrace.txt5
1 files changed, 2 insertions, 3 deletions
diff --git a/Documentation/tracers/mmiotrace.txt b/Documentation/tracers/mmiotrace.txt
index a4afb560a45..5bbbe209622 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.