[libvirt] [PATCH] cmdMigrate: move vshConnect before vshWatchJob
Ján Tomko
jtomko at redhat.com
Thu Aug 14 16:10:31 UTC 2014
On 08/08/2014 10:44 AM, Chunyan Liu wrote:
> A possible fix to issue:
> http://www.redhat.com/archives/libvir-list/2014-August/thread.html#00227
>
> While doing migration on KVM host, found problem sometimes:
> VM is already running on the target host and disappears from source
> host, but 'virsh migrate' command line hangs, cannot exit normally.
> If pressing "ENTER" key, it will exit.
>
> The code hangs at tools/virsh-domain.c: cmdMigrate
> ->vshWatchJob->poll():
> poll() is trying to select pipe_fd, which is used to receive message
> from doMigrate thread. In debugging, found that doMigrate finishes
> and at the end it does call safewrite() to write the retval ('0' or
> '1') to pipe_fd, and the write is completed. But cmdMigrate poll()
> cannot get the event. If pressing "ENTER" key, poll() can get the
> event and select pipe_fd, then command line can exit.
>
> In current code, authentication thread which is called by vshConnect
> will use stdin, and at the same time, in cmdMigrate main process,
> poll() is listening to stdin, that probably affect poll() to get
> pipe_fd event. Better to move authentication before vshWatchJob. With
> this change, above problem does not exist.
>
> Signed-off-by: Chunyan Liu <cyliu at suse.com>
> ---
> tools/virsh-domain.c | 26 ++++++++++++++++++++------
> tools/virsh.h | 1 +
> 2 files changed, 21 insertions(+), 6 deletions(-)
ACK
> diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
> index f7193cb..2562326 100644
> --- a/tools/virsh-domain.c
> +++ b/tools/virsh-domain.c
> @@ -8965,6 +8965,7 @@ doMigrate(void *opaque)
> virTypedParameterPtr params = NULL;
> int nparams = 0;
> int maxparams = 0;
> + virConnectPtr dconn = data->dconn;
>
> sigemptyset(&sigmask);
> sigaddset(&sigmask, SIGINT);
> @@ -9079,18 +9080,12 @@ doMigrate(void *opaque)
> ret = '0';
> } else {
I'd rather rewrite this condition as:
if (dconn) {
/* Traditional live migration */
} else {
/* peer2peer or direct */
}
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