Messages in this thread |  | | | Date | Tue, 26 Jan 1999 13:06:41 GMT | | From | "Stephen C. Tweedie" <> | | Subject | Re: MM deadlock [was: Re: arca-vm-8...] |
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Hi,
On Mon, 25 Jan 1999 22:59:00 +0100 (MET), Gerard Roudier <groudier@club-internet.fr> said:
> If you tell me that some system XXX is able to quickly free Mega-Bytes of > physical contiguous memory at any time when it is asked for such a > brain-deaded allocation, then for sure, I will never use system XXX, > because this magic behaviour seems not to be possible without some > paranoid VM policy that may affect badly performances for normal stuff.
It is really not hard to reserve a certain amount of memory (up to some fraction, say 25% or 50% of physical memory) for use only by pagable allocations. Most desktop boxes will _not_ require more than 50% of memory for locked kernel pages. Recovering any given range of contiguous pages from that pagable region may be expensive but will _always_ be possible, and given that it will usually be a one-off expense during driver setup, there is no reason why we cannot support it.
--Stephen
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