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authorTom Zanussi <tom.zanussi@linux.intel.com>2019-04-01 02:48:24 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2019-04-08 16:22:50 +0300
commit26a944917989d57c0dddec284b3088fa31127717 (patch)
treef00b6bbbc91e2b7634d8bc6c44574faf2cbd9a93 /Documentation/trace/histogram.rst
parent4eab1cc461a6e820eddf88ac63eed98793c96a7c (diff)
downloadlinux-26a944917989d57c0dddec284b3088fa31127717.tar.xz
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.rst16
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
---------------------------