Hello,
Seems like nobody at qemu-discuss has any clue about this topic, so I'm
forwarding my question to qemu-devel.
-------- Forwarded Message --------
Subject: QEMU Simple tracing doesn't work
Date: Tue, 4 Oct 2016 17:11:04 +0300
From: Ivan Korolev <fetc...@mail.ru>
To: qemu-disc...@nongnu.org
Hello,
I'm trying to run QEMU with simple tracing feature, but something is
wrong, because it always produces a file of 24 bytes long.
What I've done:
1) Cloned QEMU sources for version v2.7.0 release
2) Removed "[disabled]" tag in qemu/trace-events for
guest_user_syscall_ret, guest_user_syscall, guest_mem_before prototypes
3) Ran the following:
./configure --enable-trace-backends=simple
make
sudo make install
4) Ran my VM:
qemu-system-i386 -trace enable:guest_user_syscall* -hda backup.qcow2 -m
512M -net user,hostfwd=::10000-:22 -net nic -no-reboot -snapshot
-monitor stdio
5) Checked that tracepoints are enabled (ran "info trace-points" in
monitor's console):
...
guest_user_syscall_ret : state 1
guest_user_syscall : state 1
...
6) Made some actions in the VM (creating/deleting of files/folders) and
turned off the VM
When I finished with it, there was a file trace-29758 that is only 24
bytes long and simpletrace.py doesn't produce anything from it.
Could you please tell me what I'm doing wrong?
--
Regards,
Ivan Korolev
