[Xen-devel] freezing of kernel threads

["Jan Beulich" <JBeulich@xxxxxxxx>]

Keir,

in linux-2.6.18-xen.hg c/s 74:cb50d25a9468 you made blktap
match blkback in calling try_to_freeze() from the main thread loop.
Threads in other drivers didn't get changed, though. Is there a
particular reason why only block, and only backend, threads are in
need of this (the only other one using it is xenfb_thread())?

Konrad, as of 2.6.23 kernel threads are non-freezable by default,
i.e. xen-blkback calling try_to_freeze() is completely pointless
without a prior call to set_freezable(). Also, in case the latter is to
be added, switching to wait_event_freezable() instead of the
direct use of try_to_freeze() might be the right way to go.

Jan


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