[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] freezing of kernel threads
>>> On 27.11.12 at 17:47, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote: > On Thu, Nov 22, 2012 at 11:21:30AM +0000, Jan Beulich wrote: >> 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. > > OK, any idea why the need to be come freezable was added in? Just > for power suspend/resume? No, which is why I had asked Keir (who unfortunately didn't recall either). Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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