On Wed, Feb 06, 2019 at 06:28:49PM -0800, Nicolin Chen wrote:
> So we will keep allocating single pages in dev->cma_area if it's
> present, in order to address your previous concern?
Yes.
Hi Christoph,
On Wed, Feb 06, 2019 at 08:07:26AM +0100, Christoph Hellwig wrote:
> On Tue, Feb 05, 2019 at 03:05:30PM -0800, Nicolin Chen wrote:
> > > And my other concern is that this skips allocating from the per-device
> > > pool, which drivers might rely on.
> >
> > Actually Robin had the
On Tue, Feb 05, 2019 at 03:05:30PM -0800, Nicolin Chen wrote:
> > And my other concern is that this skips allocating from the per-device
> > pool, which drivers might rely on.
>
> Actually Robin had the same concern at v1 and suggested that we could
> always use DMA_ATTR_FORCE_CONTIGUOUS to
Hi Christoph
On Mon, Feb 04, 2019 at 09:23:07AM +0100, Christoph Hellwig wrote:
> On Tue, Jan 15, 2019 at 01:51:40PM -0800, Nicolin Chen wrote:
> > The addresses within a single page are always contiguous, so it's
> > not so necessary to allocate one single page from CMA area. Since
> > the CMA
On Tue, Jan 15, 2019 at 01:51:40PM -0800, Nicolin Chen wrote:
> The addresses within a single page are always contiguous, so it's
> not so necessary to allocate one single page from CMA area. Since
> the CMA area has a limited predefined size of space, it might run
> out of space in some heavy use
The addresses within a single page are always contiguous, so it's
not so necessary to allocate one single page from CMA area. Since
the CMA area has a limited predefined size of space, it might run
out of space in some heavy use case, where there might be quite a
lot CMA pages being allocated for
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