diff options
| author | Joel Fernandes <joelaf@google.com> | 2017-10-05 17:54:32 -0700 |
|---|---|---|
| committer | Joel Fernandes <joelaf@google.com> | 2017-10-06 16:16:18 -0700 |
| commit | e5486e9c8991aa5b55959c96b6b375645b12dad6 (patch) | |
| tree | 1ce4ab6f774c9632e60a7e0e85e08a208d8bffe1 /include/linux/ftrace.h | |
| parent | 139ac8ac89e5918fcbafa24e849e8c277fe2f66c (diff) | |
FROMLIST: tracing: Add support for preempt and irq enable/disable events
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.
Change-Id: I718d40f7c3c48579adf9d7121b21495a669c89bd
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zilstra <peterz@infradead.org>
Cc: kernel-team@android.com
Link: https://patchwork.kernel.org/patch/9988157/
Signed-off-by: Joel Fernandes <joelaf@google.com>
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 60048c50404e..ed94cea9eaff 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -702,7 +702,8 @@ static inline void __ftrace_enabled_restore(int enabled) 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 |