Messages in this thread | | | Subject | Re: [PATCH] mm: MADV_WILLNEED implementation for anonymous memory | From | Peter Zijlstra <> | Date | Thu, 31 Jan 2008 09:44:00 +0100 |
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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@chello.nl> 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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