Tom Zanussi f404da6e1d tracing: Add 'last error' error facility for hist triggers ... With the addition of variables and actions, it's become necessary to provide more detailed error information to users about syntax errors. Add a 'last error' facility accessible via the erroring 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. # 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 Also add specific error messages for variable and action errors. Link: http://lkml.kernel.org/r/64e9c422fc8aeafcc2f7a3b4328c0cffe7969129.1516069914.git.tom.zanussi@linux.intel.com Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>		2018-03-10 16:06:02 -05:00
..
blktrace.c	blktrace: fix trace mutex deadlock	2017-11-27 12:03:58 -07:00
bpf_trace.c	bpf: fix bpf_prog_array_copy_to_user warning from perf event prog query	2018-02-14 08:59:37 -08:00
ftrace.c	ftrace: Remove incorrect setting of glob search field	2018-02-08 10:11:11 -05:00
Kconfig	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2018-01-17 00:10:42 -05:00
Makefile	Tracing updates for 4.15:	2017-11-17 14:58:01 -08:00
power-traces.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
ring_buffer_benchmark.c	ring-buffer: Have ring_buffer_alloc_read_page() return error on offline CPU	2017-08-02 14:23:02 -04:00
ring_buffer.c	ring-buffer: Redefine the unimplemented RINGBUF_TYPE_TIME_STAMP	2018-03-10 16:05:50 -05:00
rpm-traces.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_benchmark.c	trace: Eliminate cond_resched_rcu_qs() in favor of cond_resched()	2017-12-04 10:28:58 -08:00
trace_benchmark.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_branch.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_clock.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/clock.h>	2017-03-02 08:42:27 +01:00
trace_entries.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_event_perf.c	perf/ftrace: Small cleanup	2017-10-16 18:13:28 -04:00
trace_events_filter_test.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_events_filter.c	tracing: Fix parsing of globs with a wildcard at the beginning	2018-02-08 10:11:47 -05:00
trace_events_hist.c	tracing: Add 'last error' error facility for hist triggers	2018-03-10 16:06:02 -05:00
trace_events_trigger.c	tracing: Add variable reference handling to hist triggers	2018-03-10 16:05:58 -05:00
trace_events.c	tracing: Make sure the parsed string always terminates with '\0'	2018-01-23 15:57:28 -05:00
trace_export.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_functions_graph.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_functions.c	tracing: Update stack trace skipping for ORC unwinder	2018-01-23 15:57:00 -05:00
trace_hwlat.c	trace: make trace_hwlat timestamp y2038 safe	2017-05-08 17:15:15 -07:00
trace_irqsoff.c	tracing: Add support for preempt and irq enable/disable events	2017-10-10 18:58:43 -04:00
trace_kdb.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_kprobe.c	error-injection: Separate error-injection from kprobe	2018-01-12 17:33:38 -08:00
trace_mmiotrace.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_nop.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_output.c	sched/debug: Rename task-state printing helpers	2017-10-10 11:43:29 +02:00
trace_output.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_printk.c	tracing: Handle NULL formats in hold_module_trace_bprintk_format()	2016-06-20 09:46:12 -04:00
trace_probe.c	tracing: Make traceprobe parsing code reusable	2017-10-04 13:06:44 -04:00
trace_probe.h	tracing/kprobe: bpf: Check error injectable event is on function entry	2018-01-12 17:33:37 -08:00
trace_sched_switch.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_sched_wakeup.c	Merge branch 'linus' into sched/core, to pick up fixes	2017-11-08 10:17:15 +01:00
trace_selftest_dynamic.c	ftrace: Mark function tracer test functions noinline/noclone	2018-01-23 15:57:29 -05:00
trace_selftest.c	Tracing updates for 4.15:	2017-11-17 14:58:01 -08:00
trace_seq.c
trace_stack.c	tracing: Have stack trace not record if RCU is not watching	2017-12-14 20:48:22 -05:00
trace_stat.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_stat.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_syscalls.c	Tracing updates for 4.15:	2017-11-17 14:58:01 -08:00
trace_uprobe.c	trace_uprobe: Display correct offset in uprobe_events	2018-01-23 15:57:29 -05:00
trace.c	tracing: Add variable reference handling to hist triggers	2018-03-10 16:05:58 -05:00
trace.h	tracing: Add variable reference handling to hist triggers	2018-03-10 16:05:58 -05:00
tracing_map.c	tracing: Add per-element variable support to tracing_map	2018-03-10 16:05:53 -05:00
tracing_map.h	tracing: Add per-element variable support to tracing_map	2018-03-10 16:05:53 -05:00