tree 9f89f26c7f52ff8cfca0997e8d7849dd242dc79b
parent b76ac80a5ca9f2e19405419172c0dcaf0370d4f5
author Eiichi Tsukata <eiichi.tsukata.xh@hitachi.com> 1365679515 +0900
committer Stefan Hajnoczi <stefanha@redhat.com> 1367582289 +0200

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>