Messages in this thread | | | Date | Sat, 1 Mar 2008 12:21:56 -0500 | From | Rik van Riel <> | Subject | Re: [rfc 10/10] Pageflags land grab |
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On Fri, 29 Feb 2008 20:05:44 -0800 Christoph Lameter <clameter@sgi.com> wrote:
> We have enough page flags after vmemmap no longer uses section ids. > > Reserve 5 of the 6 saved flags for functionality that is currently > under development in the VM. > > The new flags are only available if either of these conditions are met: > > 1. 64 Bit system. (then we have 8 more free of the 32) > > 2. !NUMA. In that case 2 bits are needed for the zone > id which leaves 30 page flag bits. Of those we use 24. 6 left. > > 3. !SPARSEMEM. In that case we use 5 bits of the 30 available > for the node. 1 leftover. > > 4. SPARSEMEM_VMEMMAP. Case 3 applies.
Nice! I like your patch series.
-- All rights reversed.
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