Re: [PATCH 0/4] enable migration of driver pages

[Daniel Vetter]

On Wed, Jul 29, 2015 at 11:49:45AM +0100, Mel Gorman wrote:
> On Mon, Jul 13, 2015 at 05:35:15PM +0900, Gioh Kim wrote:
> > My ARM-based platform occured severe fragmentation problem after long-term
> > (several days) test. Sometimes even order-3 page allocation failed. It has
> > memory size 512MB ~ 1024MB. 30% ~ 40% memory is consumed for graphic processing
> > and 20~30 memory is reserved for zram.
> > 
> 
> The primary motivation of this series is to reduce fragmentation by allowing
> more kernel pages to be moved. Conceptually that is a worthwhile goal but
> there should be at least one major in-kernel user and while balloon
> pages were a good starting point, I think we really need to see what the
> zram changes look like at the same time.

I think gpu drivers really would be the perfect candidate for compacting
kernel page allocations. And this also seems the primary motivation for
this patch series, so I think that's really what we should use to judge
these patches.

Of course then there's the seemingly eternal chicken/egg problem of
upstream gpu drivers for SoCs :(
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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