Zhaolei b11c53e12f ftrace: Add task_comm support for trace_event ... If we enable a trace event alone without any tracer running (such as function tracer, sched switch tracer, etc...) it can't output enough task command information. We need to use the tracing_{start/stop}_cmdline_record() helpers which are designed to keep track of cmdlines for any tasks that were scheduled during the tracing. Before this patch: # echo 1 > debugfs/tracing/events/sched/sched_switch/enable # cat debugfs/tracing/trace # tracer: nop # # TASK-PID CPU# TIMESTAMP FUNCTION # | | | | | <...>-2289 [000] 526276.724790: sched_switch: task bash:2289 [120] ==> sshd:2287 [120] <...>-2287 [000] 526276.725231: sched_switch: task sshd:2287 [120] ==> bash:2289 [120] <...>-2289 [000] 526276.725452: sched_switch: task bash:2289 [120] ==> sshd:2287 [120] <...>-2287 [000] 526276.727181: sched_switch: task sshd:2287 [120] ==> swapper:0 [140] <idle>-0 [000] 526277.032734: sched_switch: task swapper:0 [140] ==> events/0:5 [115] <...>-5 [000] 526277.032782: sched_switch: task events/0:5 [115] ==> swapper:0 [140] ... After this patch: # tracer: nop # # TASK-PID CPU# TIMESTAMP FUNCTION # | | | | | bash-2269 [000] 527347.989229: sched_switch: task bash:2269 [120] ==> sshd:2267 [120] sshd-2267 [000] 527347.990960: sched_switch: task sshd:2267 [120] ==> bash:2269 [120] bash-2269 [000] 527347.991143: sched_switch: task bash:2269 [120] ==> sshd:2267 [120] sshd-2267 [000] 527347.992959: sched_switch: task sshd:2267 [120] ==> swapper:0 [140] <idle>-0 [000] 527348.531989: sched_switch: task swapper:0 [140] ==> events/0:5 [115] events/0-5 [000] 527348.532115: sched_switch: task events/0:5 [115] ==> swapper:0 [140] ... Changelog: v1->v2: Update Kconfig to select CONTEXT_SWITCH_TRACER in ENABLE_EVENT_TRACING v2->v3: v2 can solve problem that was caused by config EVENT_TRACING alone, but when CONFIG_FTRACE is off and CONFIG_TRACING is selected by other config, compile fail happened again. This version solves it. [ Impact: fix incomplete output of event tracing ] Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com> Cc: Tom Zanussi <tzanussi@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4A14FDFE.2080402@cn.fujitsu.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>		2009-05-26 03:03:21 +02:00
..
blktrace.c	blktrace: remove debugfs entries on bad path	2009-05-19 10:29:21 +02:00
ftrace.c	tracing: fix check for return value of register_module_notifier	2009-05-18 10:24:13 +02:00
Kconfig	ftrace: Add task_comm support for trace_event	2009-05-26 03:03:21 +02:00
kmemtrace.c	tracing/filters: use ring_buffer_discard_commit() in filter_check_discard()	2009-04-14 00:00:56 +02:00
Makefile	Merge branch 'tracing/hw-branch-tracing' into tracing/core	2009-05-07 13:36:22 +02:00
ring_buffer_benchmark.c	ring-buffer: check for divide by zero in ring-buffer-benchmark	2009-05-11 13:22:26 -04:00
ring_buffer.c	ring-buffer: move code around to remove some branches	2009-05-11 23:33:06 -04:00
trace_boot.c	tracing: use macros to denote usec and nsec per second	2009-04-07 14:43:06 +02:00
trace_branch.c	Merge branch 'linus' into tracing/core	2009-05-07 11:17:34 +02:00
trace_clock.c	tracing: fix four sparse warnings	2009-03-22 18:16:54 +01:00
trace_event_profile.c	tracing/events: fix concurrent access to ftrace_events list	2009-05-06 10:38:19 +02:00
trace_event_types.h	tracing/filters: distinguish between signed and unsigned fields	2009-04-29 14:06:03 +02:00
trace_events_filter.c	tracing/filters: fix off-by-one bug	2009-05-14 23:55:12 -04:00
trace_events.c	ftrace: Add task_comm support for trace_event	2009-05-26 03:03:21 +02:00
trace_export.c	tracing/filters: distinguish between signed and unsigned fields	2009-04-29 14:06:03 +02:00
trace_functions_graph.c	function-graph: add option to calculate graph time or not	2009-03-24 23:41:11 -04:00
trace_functions.c	tracing/core: use appropriate waiting on trace_pipe	2009-02-18 01:40:20 +01:00
trace_hw_branches.c	Merge branch 'tracing/hw-branch-tracing' into tracing/core	2009-05-07 13:36:22 +02:00
trace_irqsoff.c	tracing: have latency tracers set the latency format	2009-03-04 22:15:30 -05:00
trace_mmiotrace.c	tracing: use macros to denote usec and nsec per second	2009-04-07 14:43:06 +02:00
trace_nop.c	tracing/ftrace: make nop-tracer use polling wait for events on pipe	2009-03-23 09:22:15 +01:00
trace_output.c	tracing: add trace_event_read_lock()	2009-05-25 23:53:41 +02:00
trace_output.h	tracing: add trace_event_read_lock()	2009-05-25 23:53:41 +02:00
trace_power.c	Merge branch 'linus' into tracing/core	2009-05-07 11:17:34 +02:00
trace_printk.c	tracing/ftrace: factorize the tracing files creation	2009-04-07 14:43:07 +02:00
trace_sched_switch.c	tracing/events: move trace point headers into include/trace/events	2009-04-14 22:05:43 -04:00
trace_sched_wakeup.c	tracing/wakeup: move access to wakeup_cpu into spinlock	2009-04-23 23:01:36 -04:00
trace_selftest_dynamic.c	ftrace: fix dynamic ftrace selftest	2008-05-23 21:13:23 +02:00
trace_selftest.c	x86, hw-branch-tracer: allocate selftest iterator on heap	2009-04-07 13:36:21 +02:00
trace_stack.c	tracing/ftrace: factorize the tracing files creation	2009-04-07 14:43:07 +02:00
trace_stat.c	Merge branch 'linus' into tracing/core	2009-04-07 13:47:45 +02:00
trace_stat.h	tracing: add handler to trace_stat	2009-03-24 23:22:58 -04:00
trace_syscalls.c	tracing/syscalls: use a dedicated file header	2009-04-09 05:43:32 +02:00
trace_sysprof.c	tracing/ftrace: factorize the tracing files creation	2009-04-07 14:43:07 +02:00
trace_workqueue.c	Merge branch 'linus' into tracing/core	2009-04-07 13:47:45 +02:00
trace.c	tracing: add trace_event_read_lock()	2009-05-25 23:53:41 +02:00
trace.h	Merge branch 'tracing/hw-branch-tracing' into tracing/core	2009-05-07 13:36:22 +02:00