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List:       linux-mm
Subject:    Re: question about try_to_swap_out()
From:       ralf () uni-koblenz ! de
Date:       1999-01-14 10:15:49
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On Tue, Jan 12, 1999 at 06:14:49PM +0000, Stephen C. Tweedie wrote:

> On Tue, 12 Jan 1999 10:58:52 -0600, "Paul R. Wilson"
> <wilson@cs.utexas.edu> said:
> 
> > I would think that it could be significant if you're skipping DMA
> > pages, which are valuable.  You want to get them back in a timely
> > manner, so you want to go ahead and age them normally.
> 
> We don't ever do that.  We can _require_ a DMA allocation, but we never
> explicitly avoid allocating DMA pages.

Which is a problem for certain machines which have distinct pools of DMA-able
memory and memory for normal use by the processor.

  Ralf
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