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[dm-devel] Re: [PATCH] device-mapper core should use private bioset

On Mon, Aug 14, 2006 at 02:13:32PM +0200, Stefan Bader wrote:
> I found a problem within device-mapper that occurs in low-mem
> situations. It was found using a mirror target but I think in theory it
> would hit any setup that stacks device-mapper devices (like LVM on top
> of multipath).

Several dm targets suffer from this.

Mempools are not yet used correctly everywhere in device-mapper: they
can get shared when devices are stacked, and some targets share them across
multiple instances.  I made fixing this one of the prerequisites for this
which in some cases makes people more likely to hit the problem.

There's been some progress on this recently with (unfinished) dm-crypt
patches at:
    (dm-crypt-move-io-to-workqueue.patch plus dependencies)

I'll add (the first part of) your patch to the mix as it's another required
piece of the jigsaw, thanks.


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