tracing: Enable snapshot when any latency tracer is enabled

[deliverable/linux.git] / kernel / trace / Kconfig

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index b516a8e19d510114f3f027b3458ba7e37ded4e33..590a27fc212f99a07ec016c9ead4d3230df11b1c 100644 (file)
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -191,6 +191,7 @@ config IRQSOFF_TRACER
        select GENERIC_TRACER
        select TRACER_MAX_TRACE
        select RING_BUFFER_ALLOW_SWAP
+       select TRACER_SNAPSHOT
        help
          This option measures the time spent in irqs-off critical
          sections, with microsecond accuracy.
@@ -213,6 +214,7 @@ config PREEMPT_TRACER
        select GENERIC_TRACER
        select TRACER_MAX_TRACE
        select RING_BUFFER_ALLOW_SWAP
+       select TRACER_SNAPSHOT
        help
          This option measures the time spent in preemption-off critical
          sections, with microsecond accuracy.
@@ -232,6 +234,7 @@ config SCHED_TRACER
        select GENERIC_TRACER
        select CONTEXT_SWITCH_TRACER
        select TRACER_MAX_TRACE
+       select TRACER_SNAPSHOT
        help
          This tracer tracks the latency of the highest priority task
          to be scheduled in, starting from the point it has woken up.