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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] xen-blkback: defer freeing blkif to avoid blocking xenwatch
On Mon, May 12, 2014 at 6:40 PM, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> wrote: > On 05/09/2014 07:34 PM, Valentin Priescu wrote: >> >> From: Valentin Priescu <priescuv@xxxxxxxxxx> >> >> Currently xenwatch blocks in VBD disconnect, waiting for all pending I/O >> requests to finish. If the VBD is attached to a hot-swappable disk, then >> xenwatch can hang for a long period of time, stalling other watches. > > > Note that we have a GSoC student (copied here) who is going to be looking at > xenwatch's single-threadness (?) over the summer. > AFAIK, in older kernel versions, you could pass a flag to a registered watch that told xenwatch to spawn a new kthread when it handles the events. That didn't work well and it was removed. Anyway, whatever solution he comes up with, I think he still needs to make similar changes in the disconnect path for blkback. Besides, blocking uninterruptible for a long period of time is not OK. -- Valentin _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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