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authorPekka Paalanen <pq@iki.fi>2008-11-23 22:24:59 +0300
committerIngo Molnar <mingo@elte.hu>2008-11-23 22:33:24 +0300
commitfb91ee6cf5b8be5360acec577458e29ec7e97e5e (patch)
treec8eba73ad72f0c86658bb4a03bc6a04ef3d7e225
parent7ee1768ddb3075ae3a0801cc2d0ea4195530a7db (diff)
downloadlinux-fb91ee6cf5b8be5360acec577458e29ec7e97e5e.tar.xz
tracing, doc: update mmiotrace documentation
Impact: update documentation Update to reflect the current state of the tracing framework: - "none" tracer has been replaced by "nop" tracer - tracing_enabled must be toggled when changing buffer size Signed-off-by: Pekka Paalanen <pq@iki.fi> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--Documentation/tracers/mmiotrace.txt6
1 files changed, 4 insertions, 2 deletions
diff --git a/Documentation/tracers/mmiotrace.txt b/Documentation/tracers/mmiotrace.txt
index 5bbbe2096223..cde23b4a12a1 100644
--- a/Documentation/tracers/mmiotrace.txt
+++ b/Documentation/tracers/mmiotrace.txt
@@ -37,7 +37,7 @@ $ echo mmiotrace > /debug/tracing/current_tracer
$ cat /debug/tracing/trace_pipe > mydump.txt &
Start X or whatever.
$ echo "X is up" > /debug/tracing/trace_marker
-$ echo none > /debug/tracing/current_tracer
+$ echo nop > /debug/tracing/current_tracer
Check for lost events.
@@ -66,7 +66,7 @@ which action. It is recommended to place descriptive markers about what you
do.
Shut down mmiotrace (requires root privileges):
-$ echo none > /debug/tracing/current_tracer
+$ echo nop > /debug/tracing/current_tracer
The 'cat' process exits. If it does not, kill it by issuing 'fg' command and
pressing ctrl+c.
@@ -81,7 +81,9 @@ are:
$ cat /debug/tracing/trace_entries
gives you a number. Approximately double this number and write it back, for
instance:
+$ echo 0 > /debug/tracing/tracing_enabled
$ echo 128000 > /debug/tracing/trace_entries
+$ echo 1 > /debug/tracing/tracing_enabled
Then start again from the top.
If you are doing a trace for a driver project, e.g. Nouveau, you should also