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trace: Add ftrace tracing backend

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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>
This commit is contained in:
Eiichi Tsukata 2013-04-11 20:25:15 +09:00 • committed by Stefan Hajnoczi
parent b76ac80a5c
commit 781e9545db
5 changed files with 175 additions and 0 deletions
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8
configure vendored
View file

@ -4004,6 +4004,14 @@ if test "$trace_backend" = "dtrace"; then
echo "CONFIG_TRACE_SYSTEMTAP=y" >> $config_host_mak
fi
fi
if test "$trace_backend" = "ftrace"; then
if test "$linux" = "yes" ; then
echo "CONFIG_TRACE_FTRACE=y" >> $config_host_mak
trace_default=no
else
feature_not_found "ftrace(trace backend)"
fi
fi
echo "CONFIG_TRACE_FILE=$trace_file" >> $config_host_mak
if test "$trace_default" = "yes"; then
echo "CONFIG_TRACE_DEFAULT=y" >> $config_host_mak