kernel/trace/Kconfig

   1 #
   2 # Architectures that offer an FTRACE implementation should select HAVE_FTRACE:
   3 #
   4 config HAVE_FTRACE
   5         bool
   6
   7 config TRACER_MAX_TRACE
   8         bool
   9
  10 config TRACING
  11         bool
  12         select DEBUG_FS
  13
  14 config FTRACE
  15         bool "Kernel Function Tracer"
  16         depends on DEBUG_KERNEL && HAVE_FTRACE
  17         select FRAME_POINTER
  18         select TRACING
  19         select CONTEXT_SWITCH_TRACER
  20         help
  21           Enable the kernel to trace every kernel function. This is done
  22           by using a compiler feature to insert a small, 5-byte No-Operation
  23           instruction to the beginning of every kernel function, which NOP
  24           sequence is then dynamically patched into a tracer call when
  25           tracing is enabled by the administrator. If it's runtime disabled
  26           (the bootup default), then the overhead of the instructions is very
  27           small and not measurable even in micro-benchmarks.
  28
  29 config SCHED_TRACER
  30         bool "Scheduling Latency Tracer"
  31         depends on DEBUG_KERNEL
  32         select TRACING
  33         select CONTEXT_SWITCH_TRACER
  34         select TRACER_MAX_TRACE
  35         help
  36           This tracer tracks the latency of the highest priority task
  37           to be scheduled in, starting from the point it has woken up.
  38
  39 config CONTEXT_SWITCH_TRACER
  40         bool "Trace process context switches"
  41         depends on DEBUG_KERNEL
  42         select TRACING
  43         select MARKERS
  44         help
  45           This tracer gets called from the context switch and records
  46           all switching of tasks.
  47