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| author | Tom Zanussi | 2019-04-01 01:48:24 +0200 |
|---|---|---|
| committer | Steven Rostedt (VMware) | 2019-04-08 15:22:50 +0200 |
| commit | 26a944917989d57c0dddec284b3088fa31127717 (patch) | |
| tree | f00b6bbbc91e2b7634d8bc6c44574faf2cbd9a93 /Documentation/trace/histogram.rst | |
| parent | selftests/ftrace: Add tracing/error_log testcase (diff) | |
| download | kernel-qcow2-linux-26a944917989d57c0dddec284b3088fa31127717.tar.gz kernel-qcow2-linux-26a944917989d57c0dddec284b3088fa31127717.tar.xz kernel-qcow2-linux-26a944917989d57c0dddec284b3088fa31127717.zip | |
tracing: Add tracing/error_log Documentation
Move most of the hist trigger extended error documentation to
ftrace.rst and expand on it to fully document tracing/error_log.
Link: http://lkml.kernel.org/r/c5d53c8f643ef6844d6ad8d0200c116936730b01.1554072478.git.tom.zanussi@linux.intel.com
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'Documentation/trace/histogram.rst')
| -rw-r--r-- | Documentation/trace/histogram.rst | 16 |
1 files changed, 2 insertions, 14 deletions
diff --git a/Documentation/trace/histogram.rst b/Documentation/trace/histogram.rst index 0ea59d45aef1..7612c7ad5715 100644 --- a/Documentation/trace/histogram.rst +++ b/Documentation/trace/histogram.rst @@ -199,20 +199,8 @@ Extended error information For some error conditions encountered when invoking a hist trigger command, extended error information is available via the - corresponding event's 'hist' file. Reading the hist file after an - error will display more detailed information about what went wrong, - if information is available. This extended error information will - be available until the next hist trigger command for that event. - - If available for a given error condition, the extended error - information and usage takes the following form:: - - # echo xxx > /sys/kernel/debug/tracing/events/sched/sched_wakeup/trigger - echo: write error: Invalid argument - - # cat /sys/kernel/debug/tracing/events/sched/sched_wakeup/hist - ERROR: Couldn't yyy: zzz - Last command: xxx + tracing/error_log file. See Error Conditions in + :file:`Documentation/trace/ftrace.rst` for details. 6.2 'hist' trigger examples --------------------------- |