Apply preempt_rt patch-4.9-rt1.patch.xz

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

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 2a96b063d6590f326410feaa55fbb7f817241c0c..812e37237eb8f77edfcf469914b24654e4b0f648 100644 (file)
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -182,6 +182,24 @@ config IRQSOFF_TRACER
          enabled. This option and the preempt-off timing option can be
          used together or separately.)
 
+config INTERRUPT_OFF_HIST
+       bool "Interrupts-off Latency Histogram"
+       depends on IRQSOFF_TRACER
+       help
+         This option generates continuously updated histograms (one per cpu)
+         of the duration of time periods with interrupts disabled. The
+         histograms are disabled by default. To enable them, write a non-zero
+         number to
+
+             /sys/kernel/debug/tracing/latency_hist/enable/preemptirqsoff
+
+         If PREEMPT_OFF_HIST is also selected, additional histograms (one
+         per cpu) are generated that accumulate the duration of time periods
+         when both interrupts and preemption are disabled. The histogram data
+         will be located in the debug file system at
+
+             /sys/kernel/debug/tracing/latency_hist/irqsoff
+
 config PREEMPT_TRACER
        bool "Preemption-off Latency Tracer"
        default n
@@ -206,6 +224,24 @@ config PREEMPT_TRACER
          enabled. This option and the irqs-off timing option can be
          used together or separately.)
 
+config PREEMPT_OFF_HIST
+       bool "Preemption-off Latency Histogram"
+       depends on PREEMPT_TRACER
+       help
+         This option generates continuously updated histograms (one per cpu)
+         of the duration of time periods with preemption disabled. The
+         histograms are disabled by default. To enable them, write a non-zero
+         number to
+
+             /sys/kernel/debug/tracing/latency_hist/enable/preemptirqsoff
+
+         If INTERRUPT_OFF_HIST is also selected, additional histograms (one
+         per cpu) are generated that accumulate the duration of time periods
+         when both interrupts and preemption are disabled. The histogram data
+         will be located in the debug file system at
+
+             /sys/kernel/debug/tracing/latency_hist/preemptoff
+
 config SCHED_TRACER
        bool "Scheduling Latency Tracer"
        select GENERIC_TRACER
@@ -251,6 +287,74 @@ config HWLAT_TRACER
         file. Every time a latency is greater than tracing_thresh, it will
         be recorded into the ring buffer.
 
+config WAKEUP_LATENCY_HIST
+       bool "Scheduling Latency Histogram"
+       depends on SCHED_TRACER
+       help
+         This option generates continuously updated histograms (one per cpu)
+         of the scheduling latency of the highest priority task.
+         The histograms are disabled by default. To enable them, write a
+         non-zero number to
+
+             /sys/kernel/debug/tracing/latency_hist/enable/wakeup
+
+         Two different algorithms are used, one to determine the latency of
+         processes that exclusively use the highest priority of the system and
+         another one to determine the latency of processes that share the
+         highest system priority with other processes. The former is used to
+         improve hardware and system software, the latter to optimize the
+         priority design of a given system. The histogram data will be
+         located in the debug file system at
+
+             /sys/kernel/debug/tracing/latency_hist/wakeup
+
+         and
+
+             /sys/kernel/debug/tracing/latency_hist/wakeup/sharedprio
+
+         If both Scheduling Latency Histogram and Missed Timer Offsets
+         Histogram are selected, additional histogram data will be collected
+         that contain, in addition to the wakeup latency, the timer latency, in
+         case the wakeup was triggered by an expired timer. These histograms
+         are available in the
+
+             /sys/kernel/debug/tracing/latency_hist/timerandwakeup
+
+         directory. They reflect the apparent interrupt and scheduling latency
+         and are best suitable to determine the worst-case latency of a given
+         system. To enable these histograms, write a non-zero number to
+
+             /sys/kernel/debug/tracing/latency_hist/enable/timerandwakeup
+
+config MISSED_TIMER_OFFSETS_HIST
+       depends on HIGH_RES_TIMERS
+       select GENERIC_TRACER
+       bool "Missed Timer Offsets Histogram"
+       help
+         Generate a histogram of missed timer offsets in microseconds. The
+         histograms are disabled by default. To enable them, write a non-zero
+         number to
+
+             /sys/kernel/debug/tracing/latency_hist/enable/missed_timer_offsets
+
+         The histogram data will be located in the debug file system at
+
+             /sys/kernel/debug/tracing/latency_hist/missed_timer_offsets
+
+         If both Scheduling Latency Histogram and Missed Timer Offsets
+         Histogram are selected, additional histogram data will be collected
+         that contain, in addition to the wakeup latency, the timer latency, in
+         case the wakeup was triggered by an expired timer. These histograms
+         are available in the
+
+             /sys/kernel/debug/tracing/latency_hist/timerandwakeup
+
+         directory. They reflect the apparent interrupt and scheduling latency
+         and are best suitable to determine the worst-case latency of a given
+         system. To enable these histograms, write a non-zero number to
+
+             /sys/kernel/debug/tracing/latency_hist/enable/timerandwakeup
+
 config ENABLE_DEFAULT_TRACERS
        bool "Trace process context switches and events"
        depends on !GENERIC_TRACER