Re: MM deadlock [was: Re: arca-vm-8...]

yodaiken
1999-01-30T07:14:43Z

>
> Hi,
>
> On Tue, 26 Jan 1999 15:46:23 +0000 (GMT), alan@lxorguk.ukuu.org.uk (Alan
> Cox) said:
> > We don't need to solve the 100% case. Simply being sure we can (slowly)
> > allocate up to 25% of RAM in huge chunks is going to be enough. Good point
> > Ingo on one thing I'd missed - the big chunks themselves need some kind
> > of handles since the moment we hand out 512K chunks we may not be able to
> > shuffle and get a 4Mb block
>
> The idea was to decide what region to hand out, _then_ to clear it.
> Standard best-fit algorithms apply when carving up the region.

If clearing involves remapping kernel address space, then its a rather
complex process.
kmalloc
give virt_to_bus to device
...
remap

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