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| -rw-r--r-- | config/Config-kernel.in | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/config/Config-kernel.in b/config/Config-kernel.in index 3f013aa2b2..22e2286b8d 100644 --- a/config/Config-kernel.in +++ b/config/Config-kernel.in @@ -266,6 +266,40 @@ config KERNEL_FUNCTION_PROFILER depends on KERNEL_FUNCTION_TRACER default n +config KERNEL_IRQSOFF_TRACER + bool "Interrupts-off Latency Tracer" + depends on KERNEL_FTRACE + help + This option measures the time spent in irqs-off critical + sections, with microsecond accuracy. + + The default measurement method is a maximum search, which is + disabled by default and can be runtime (re-)started + via: + + echo 0 > /sys/kernel/debug/tracing/tracing_max_latency + + (Note that kernel size and overhead increase with this option + enabled. This option and the preempt-off timing option can be + used together or separately.) + +config KERNEL_PREEMPT_TRACER + bool "Preemption-off Latency Tracer" + depends on KERNEL_FTRACE + help + This option measures the time spent in preemption-off critical + sections, with microsecond accuracy. + + The default measurement method is a maximum search, which is + disabled by default and can be runtime (re-)started + via: + + echo 0 > /sys/kernel/debug/tracing/tracing_max_latency + + (Note that kernel size and overhead increase with this option + enabled. This option and the irqs-off timing option can be + used together or separately.) + config KERNEL_DEBUG_KERNEL bool default n |