Re: [PATCH] mm: MADV_WILLNEED implementation for anonymous memory

[Peter Zijlstra]

On Wed, 2008-01-30 at 14:40 -0800, Andrew Morton wrote:
> On Wed, 30 Jan 2008 18:28:59 +0100
> Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote:
> 
> > Implement MADV_WILLNEED for anonymous pages by walking the page tables and
> > starting asynchonous swap cache reads for all encountered swap pages.
> 
> Why cannot this use (a perhaps suitably-modified) make_pages_present()?

Because make_pages_present() relies on page faults to bring data in and
will thus wait for all data to be present before returning.

This solution is async; it will just issue a read for the requested
pages and moves on.


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