[Xen-devel] [PATCH] xend: Sleep before sending SIGKILL to device model

[Yosuke Iwamatsu <y-iwamatsu@xxxxxxxxxxxxx>]

When we destroy a domain, xend sends SIGTERM to the device model and
wait by waitpid() until the device model process disappears.
If we restarted xend during the lifetime of the domain, waitpid() fails
because the device model is no longer a child of xend, and in that case
xend gives up waiting for the shutdown of process and just send it
SIGKILL immediately. This is problematic because most of the case the
device model will be forcibly killed by xend before shutting itself
down.
This patch adds time.sleep before sending SIGKILL to the device model.
On my test box shutdown of a device model usually takes about 0.5 sec,
so waiting two seconds should be enough in most cases.

Regards,
-----------------------
Yosuke Iwamatsu
        NEC Corporation

Signed-off-by: Yosuke Iwamatsu <y-iwamatsu@xxxxxxxxxxxxx>

Attachment: xend_dm_sigkill.patch
Description: all/allfiles

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