Re: [PATCH] mm: add resched points to remap_pmd_range/ioremap_pmd_range

[Jörn Engel]

On Mon, Jul 27, 2015 at 09:08:42AM +0200, Michal Hocko wrote:
> On Fri 24-07-15 09:56:27, JÃrn Engel wrote:
> > On Fri, Jul 24, 2015 at 09:04:21AM +0200, Michal Hocko wrote:
> > > On Thu 23-07-15 14:54:33, Spencer Baugh wrote:
> > > > From: Joern Engel <joern@xxxxxxxxx>
> > > > 
> > > > Mapping large memory spaces can be slow and prevent high-priority
> > > > realtime threads from preempting lower-priority threads for a long time.
> > > 
> > > How can a lower priority task block the high priority one? Do you have
> > > preemption disabled?
> > 
> > Yes.

We have kernel preemption disabled.  A lower-priority task in a system
call will block higher-priority tasks.

JÃrn

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