trace-events

   1 # Trace events for debugging and performance instrumentation
   2 #
   3 # This file is processed by the tracetool script during the build.
   4 #
   5 # To add a new trace event:
   6 #
   7 # 1. Choose a name for the trace event.  Declare its arguments and format
   8 #    string.
   9 #
  10 # 2. Call the trace event from code using trace_##name, e.g. multiwrite_cb() ->
  11 #    trace_multiwrite_cb().  The source file must #include "trace.h".
  12 #
  13 # Format of a trace event:
  14 #
  15 # [disable] <name>(<type1> <arg1>[, <type2> <arg2>] ...) "<format-string>"
  16 #
  17 # Example: qemu_malloc(size_t size) "size %zu"
  18 #
  19 # The "disable" keyword will build without the trace event.
  20 # In case of 'simple' trace backend, it will allow the trace event to be
  21 # compiled, but this would be turned off by default. It can be toggled on via
  22 # the monitor.
  23 #
  24 # The <name> must be a valid as a C function name.
  25 #
  26 # Types should be standard C types.  Use void * for pointers because the trace
  27 # system may not have the necessary headers included.
  28 #
  29 # The <format-string> should be a sprintf()-compatible format string.
  30
  31 # qemu-malloc.c
  32 disable qemu_malloc(size_t size, void *ptr) "size %zu ptr %p"
  33 disable qemu_realloc(void *ptr, size_t size, void *newptr) "ptr %p size %zu newptr %p"
  34 disable qemu_free(void *ptr) "ptr %p"
  35
  36 # osdep.c
  37 disable qemu_memalign(size_t alignment, size_t size, void *ptr) "alignment %zu size %zu ptr %p"
  38 disable qemu_valloc(size_t size, void *ptr) "size %zu ptr %p"
  39 disable qemu_vfree(void *ptr) "ptr %p"