@@ -107,6 +107,7 @@ config IRQSOFF_TRACER
select TRACE_IRQFLAGS
select TRACING
select TRACER_MAX_TRACE
+ select FRAME_POINTER
help
This option measures the time spent in irqs-off critical
sections, with microsecond accuracy.
@@ -128,6 +129,7 @@ config PREEMPT_TRACER
depends on PREEMPT
select TRACING
select TRACER_MAX_TRACE
+ select FRAME_POINTER
help
This option measures the time spent in preemption off critical
sections, with microsecond accuracy.
@@ -156,6 +158,7 @@ config SCHED_TRACER
select TRACING
select CONTEXT_SWITCH_TRACER
select TRACER_MAX_TRACE
+ select FRAME_POINTER
help
This tracer tracks the latency of the highest priority task
to be scheduled in, starting from the point it has woken up.
Irqsoff, switch and preempt tracers use CALLER_ADDR macros, so they should select FRAME_POINTER. Otherwise traces are meaningless. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> --- kernel/trace/Kconfig | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)