diff options
Diffstat (limited to 'trace-events')
| -rw-r--r-- | trace-events | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/trace-events b/trace-events new file mode 100644 index 0000000000..a37d3cc6e3 --- /dev/null +++ b/trace-events @@ -0,0 +1,24 @@ +# Trace events for debugging and performance instrumentation +# +# This file is processed by the tracetool script during the build. +# +# To add a new trace event: +# +# 1. Choose a name for the trace event. Declare its arguments and format +# string. +# +# 2. Call the trace event from code using trace_##name, e.g. multiwrite_cb() -> +# trace_multiwrite_cb(). The source file must #include "trace.h". +# +# Format of a trace event: +# +# <name>(<type1> <arg1>[, <type2> <arg2>] ...) "<format-string>" +# +# Example: qemu_malloc(size_t size) "size %zu" +# +# The <name> must be a valid as a C function name. +# +# Types should be standard C types. Use void * for pointers because the trace +# system may not have the necessary headers included. +# +# The <format-string> should be a sprintf()-compatible format string. |