[Linaro-mm-sig] Memory region attribute bits and multiple mappings

Arnd Bergmann arnd at arndb.de
Wed Apr 27 19:21:28 UTC 2011


On Wednesday 27 April 2011 21:12:33 Zach Pfeffer wrote:
> On 27 April 2011 09:16, Marek Szyprowski <m.szyprowski at samsung.com> wrote:

> >> > I want to merge this idea with changing changing the kernel linear low-
> >> mem
> >> > mapping, so 2-level page mapping will be done only for the defined CMA
> >> > range, what should reduce TLB pressure. Once the contiguous block is
> >> > allocated from CMA range, the mapping in low-mem area can be removed to
> >> > fulfill the ARM specification.
> 
> We could keep the mapping around and just mark it inactive. If we
> could handle the multiple mappers problem on-demand that could
> streamline things.

According to what Catalin wrote today, even that is not necessary any
more, as the ARM ARM gets updated to allow it. We only need to flush
the cache for the linear mapping before we establish another one, AFAICT.

	Arnd



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