On Thu, Dec 20, 2007 at 05:53:41PM +0100, Peter Zijlstra wrote:
>
> On Thu, 2007-12-20 at 15:26 +0000, Hugh Dickins wrote:
>
> > The asynch code: perhaps not worth doing for MADV_WILLNEED alone,
> > but might prove useful for more general use when swapping in.
> > Not really the same as Con's swap prefetch, but worth looking
> > at that for reference. But I guess this becomes a much bigger
> > issue than you were intending to get into here.
>
> heh, yeah, got somewhat more complex that I'd hoped for.
>
> last patch for today (not even compile tested), will do a proper patch
> and test it tomorrow.
>
> ---
> A best effort MADV_WILLNEED implementation for anonymous memory.
>
> It adds a batch method to the page table walk routines so we can
> copy a few ptes while holding the kmap, which makes it possible to
> allocate the backing pages using GFP_KERNEL.
Yuck. We actually need to just fix the atomic kmap issue in the
existing pagemap code rather than add a new method, I think.
If performance of map/unmap is too slow at a granularity of 1, we can
add some internal batching in the CONFIG_HIGHPTE case.
--
Mathematics is the supreme nostalgia of our time.
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