diff options
| author | Joel Fernandes <joelaf@google.com> | 2017-10-10 15:51:37 -0700 |
|---|---|---|
| committer | Amit Pundir <amit.pundir@linaro.org> | 2017-12-18 21:11:22 +0530 |
| commit | b657a6f6f865e24e8d96f853bc9b62c98e7a1409 (patch) | |
| tree | e720eaf04c8f74475750134ca4b4191e518e3019 /include/linux/ftrace.h | |
| parent | 3e27f9ca436e06cec3c906544d357a0a33a56164 (diff) | |
UPSTREAM: tracing: Add support for preempt and irq enable/disable events
commit d59158162e032917a428704160a2063a02405ec6 upstream.
Preempt and irq trace events can be used for tracing the start and
end of an atomic section which can be used by a trace viewer like
systrace to graphically view the start and end of an atomic section and
correlate them with latencies and scheduling issues.
This also serves as a prelude to using synthetic events or probes to
rewrite the preempt and irqsoff tracers, along with numerous benefits of
using trace events features for these events.
Link: http://lkml.kernel.org/r/20171006005432.14244-3-joelaf@google.com
Link: http://lkml.kernel.org/r/20171010225137.17370-1-joelaf@google.com
Cc: Peter Zilstra <peterz@infradead.org>
Cc: kernel-team@android.com
Signed-off-by: Joel Fernandes <joelaf@google.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Diffstat (limited to 'include/linux/ftrace.h')
| -rw-r--r-- | include/linux/ftrace.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index e54d257983f2..07edd89dca53 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -743,7 +743,8 @@ static inline unsigned long get_lock_parent_ip(void) static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { } #endif -#ifdef CONFIG_PREEMPT_TRACER +#if defined(CONFIG_PREEMPT_TRACER) || \ + (defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_PREEMPTIRQ_EVENTS)) extern void trace_preempt_on(unsigned long a0, unsigned long a1); extern void trace_preempt_off(unsigned long a0, unsigned long a1); #else |