diff options
| author | Eiichi Tsukata <eiichi.tsukata.xh@hitachi.com> | 2013-04-11 20:25:15 +0900 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2013-05-03 13:58:09 +0200 |
| commit | 781e9545dbe54d2f0a530edbf48fd0ac1e77244c (patch) | |
| tree | 9f89f26c7f52ff8cfca0997e8d7849dd242dc79b /trace/ftrace.h | |
| parent | b76ac80a5ca9f2e19405419172c0dcaf0370d4f5 (diff) | |
trace: Add ftrace tracing backend
This patch adds a ftrace tracing backend which sends trace event to
ftrace marker file. You can effectively compare qemu trace data and
kernel(especially, kvm.ko when using KVM) trace data.
The ftrace backend is restricted to Linux only.
To try out the ftrace backend:
$ ./configure --trace-backend=ftrace
$ make
if you use KVM, enable kvm events in ftrace:
# sudo echo 1 > /sys/kernel/debug/tracing/events/kvm/enable
After running qemu by root user, you can get the trace:
# cat /sys/kernel/debug/tracing/trace
Signed-off-by: Eiichi Tsukata <eiichi.tsukata.xh@hitachi.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'trace/ftrace.h')
| -rw-r--r-- | trace/ftrace.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/trace/ftrace.h b/trace/ftrace.h new file mode 100644 index 0000000000..94cb8d5365 --- /dev/null +++ b/trace/ftrace.h @@ -0,0 +1,10 @@ +#ifndef TRACE_FTRACE_H +#define TRACE_FTRACE_H + +#define MAX_TRACE_STRLEN 512 +#define _STR(x) #x +#define STR(x) _STR(x) + +extern int trace_marker_fd; + +#endif /* ! TRACE_FTRACE_H */ |