On Tue, Jul 10, 2007 at 12:11:45PM -0500, Dave McCracken wrote:
> Ok, maybe disaster is too strong a word. But any kind of order>0 allocation
> still has to be approached with fear and caution, with a well tested fallback
> in the case of the inevitable failures. How many driver writers would have
> benefited from using order>0 pages, but turned aside to other less optimal
> solutions due to their unreliability? We don't know, and probably never
> will. Those people have moved on and won't revisit that design decision.
If you look at almost any other OS they use high-order pages quite a lot.
At least Solaris, IRIX and UnixWare do.
Also not that once we have a high-order pagecache it gives a nice way
to simply reclaim a high-order page directly :)
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