linux/Documentation/trace
Tom Zanussi 5463bfda32 tracing: Add support for named hist triggers
Allow users to define 'named' hist triggers.  All triggers created
with the same 'name=xxx' option will update the same shared histogram
data.

This expands the hist trigger syntax from this:

    # echo hist:keys=xxx ... [ if filter] > event/trigger

to this:

    # echo hist:name=xxx:keys=xxx ... [ if filter] > event/trigger

Named histograms must use a 'compatible' set of keys and values, which
means each event added to a set of named triggers must have the same
names and types.

Reading the 'hist' file of any of the participating events will
produce the same output as any other participating event, which is to
be expected since they share the same data.

Link: http://lkml.kernel.org/r/1dbc84ee3322a75daaf5b3ef1d0cc0a2fb682fc7.1457029949.git.tom.zanussi@linux.intel.com

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2016-04-19 18:56:01 -04:00
..
postprocess x86, tracing, perf: Add trace point for MSR accesses 2015-12-06 12:56:10 +01:00
coresight.txt Doc: trace: Fix typo in coresight.txt 2015-08-05 13:30:16 -07:00
events-kmem.txt
events-msr.txt x86, tracing, perf: Add trace point for MSR accesses 2015-12-06 12:56:10 +01:00
events-nmi.txt
events-power.txt PM / QoS: Rename device resume latency QoS items 2014-02-11 00:35:23 +01:00
events.txt tracing: Add support for named hist triggers 2016-04-19 18:56:01 -04:00
ftrace-design.txt ftrace: Remove check for HAVE_FUNCTION_TRACE_MCOUNT_TEST 2014-07-18 13:57:01 -04:00
ftrace.txt tracing: Update the documentation to describe "event-fork" option 2016-04-19 10:28:29 -04:00
function-graph-fold.vim
intel_th.txt intel_th: Add driver infrastructure for Intel(R) Trace Hub devices 2015-10-04 20:28:58 +01:00
kprobetrace.txt
mmiotrace.txt
ring-buffer-design.txt doc: fix double words 2014-03-21 13:16:58 +01:00
stm.txt stm class: Introduce an abstraction for System Trace Module devices 2015-10-04 20:28:58 +01:00
tracepoint-analysis.txt
tracepoints.txt tracing: Add trace_<tracepoint>_enabled() function 2014-05-07 12:10:51 -04:00
uprobetracer.txt tracing/uprobes: Add @+file_offset fetch method 2014-01-02 20:57:05 -05:00