At Fri, 27 Aug 2004 23:04:26 -0700,
William Lee Irwin III wrote:

On Fri, Aug 27, 2004 at 07:02:07PM +0200, Takashi Iwai wrote:

quoted

In the primary version of my DMA allocation patch, I tried to allocate
pages with GFP_DMA as much as possible, then allocate with GFP_KERNEL
as fallback.  But this doesn't work.  When the zone DMA is exhausted,
I oberseved endless OOM-killer.
Is this a desired behavior?  I don't think triggering OOM-killer for
zone DMA makes sense, because apps don't allocate pages in this
area...
Note that the driver tried to allocate bunch of single pages with
GFP_DMA, not big pages, by calling dma_alloc_coherent with GFP_DMA
only (no __GFP_REPEAT or such modifiers).

How are you triggering this?

Tried to allocate as many single pages as possible with
dma_alloc_coherent() with 31bit coherent_dma_mask.


Takashi
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