Messages in this thread | | | From | (Linus Torvalds) | Subject | Re: large page patch | Date | Fri, 2 Aug 2002 03:23:39 +0000 (UTC) |
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In article <20020801.181944.09310618.davem@redhat.com>, David S. Miller <davem@redhat.com> wrote: > From: Andrew Morton <akpm@zip.com.au> > Date: Thu, 01 Aug 2002 18:26:40 -0700 > > "David S. Miller" wrote: > > This is probably done to increase the likelyhood that 4MB page orders > > are available. If we collapse 4MB pages deeper, they are less likely > > to be broken up because smaller orders would be selected first. > > This is leakage from ia64, which supports up to 256k pages. > >Ummm, 4MB > 256K and even with a 4K PAGE_SIZE MAX_ORDER coalesces >up to 4MB already :-)
That should be 256_M_ pages (13 bits of page size + 15 bits of MAX_ORDER gives you 256MB max).
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