Re: [RFCv2] mm: page allocation for less fragmentation

[Gioh Kim]

2015-03-25 ìí 7:56ì Mel Gorman ì(ê) ì ê:
> On Wed, Mar 25, 2015 at 11:39:15AM +0900, Gioh Kim wrote:
> > My driver allocates more than 40MB pages via alloc_page() at a time and
> > maps them at virtual address. Totally it uses 300~400MB pages.
> >
> > If I run a heavy load test for a few days in 1GB memory system, I cannot allocate even order=3 pages
> > because-of the external fragmentation.
> >
> > I thought I needed a anti-fragmentation solution for my driver.
> > But there is no allocation function that considers fragmentation.
> > The compaction is not helpful because it is only for movable pages, not unmovable pages.
> >
> > This patch proposes a allocation function allocates only pages in the same pageblock.
>
> Is this not what CMA is for? Or creating a MOVABLE zone?

It's not related to CMA and MOVABLE zone.
It's for compaction and anti-fragmentation for any zone.


>
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