[dm-devel] [PATCH v7 9/9] block: Avoid deadlocks with bio allocation by stacking drivers

[Kent Overstreet]

On Tue, Sep 04, 2012 at 12:01:19PM -0700, Tejun Heo wrote:
> On Tue, Sep 04, 2012 at 11:55:40AM -0700, Tejun Heo wrote:
> > Actually, if the timer approach can reduce the frequency of rescuer
> > involvement, I think it could actually be better.
> 
> Ooh, it wouldn't.  It's kicking in only after alloc failure.  I don't
> know.  I think conditioning it on alloc failure is cleaner and
> converting all per-bio allocations to front-pad makes sense.  Using a
> timer wouldn't make the mechanism any simpler, right?

Exactly