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xen-devel
Re: [Xen-devel][PATCH]improve suspend_evtchn lock processing
Chun Yan Liu writes ("[Xen-devel][PATCH]improve suspend_evtchn lock
processing"):
> While doing migration, sometimes found suspend lock file was not
> unlinked in previous operations, then there is an obsolete lock file
> in place, which causes the current and later migration cannot get
> lock. That happens seldomly but do happen.
I think we should be using fcntl or flock, not an O_EXCL lockfile.
This kind of messing about with pids reduces the proportion of
situations where things go wrong, but it cannot be made race-free.
Ian.
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