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tracing, doc: update mmiotrace documentation

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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 - "none" tracer has been replaced by "nop" tracer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>
This commit is contained in:
Pekka Paalanen 2008-11-23 21:24:59 +02:00 committed by Ingo Molnar
parent 7ee1768ddb
commit fb91ee6cf5
1 changed files with 4 additions and 2 deletions
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6
Documentation/tracers/mmiotrace.txt
View file

@ -37,7 +37,7 @@ $ echo mmiotrace > /debug/tracing/current_tracer
$ cat /debug/tracing/trace_pipe > mydump.txt & $ cat /debug/tracing/trace_pipe > mydump.txt &
Start X or whatever. Start X or whatever.
$ echo "X is up" > /debug/tracing/trace_marker $ echo "X is up" > /debug/tracing/trace_marker
$ echo none > /debug/tracing/current_tracer $ echo nop > /debug/tracing/current_tracer
Check for lost events. Check for lost events.
@ -66,7 +66,7 @@ which action. It is recommended to place descriptive markers about what you
do. do.
Shut down mmiotrace (requires root privileges): 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 The 'cat' process exits. If it does not, kill it by issuing 'fg' command and
pressing ctrl+c. pressing ctrl+c.
@ -81,7 +81,9 @@ are:
$ cat /debug/tracing/trace_entries $ cat /debug/tracing/trace_entries
gives you a number. Approximately double this number and write it back, for gives you a number. Approximately double this number and write it back, for
instance: instance:
$ echo 0 > /debug/tracing/tracing_enabled
$ echo 128000 > /debug/tracing/trace_entries $ echo 128000 > /debug/tracing/trace_entries
$ echo 1 > /debug/tracing/tracing_enabled
Then start again from the top. Then start again from the top.
If you are doing a trace for a driver project, e.g. Nouveau, you should also If you are doing a trace for a driver project, e.g. Nouveau, you should also