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DateThu, 9 Jul 1998 12:03:16 +0100
From"Stephen C. Tweedie" <>
SubjectRe: Intel's Extended Server Memory Architecture ? (fwd)
Hi,

On Sun, 05 Jul 1998 22:14:58 -0300, "Brandon S. Allbery KF8NH"
<allbery@kf8nh.apk.net> said:

> Apparently somewhat less obviously to some, demand paging to/from wither 
> swap or an executable requires mmap (bmap, in kernel lingo) functionality.  
> This is an issue of fundamental Linux MM design, not an aspect of a specific 
> driver.  IOW, a ramdisk in this new \:uber-EMS *can't* be used for either 
> swap or for executables without a serious redesign of the entire MM 
> architecture.

Errm, hows that?

Hint: NFS supports mmap().  NFS will never, ever support bmap().  The
one thing bmap() gains you is direct DMA from the swap/page cache into a
block device; if you're willing to put up with a copy then you don't
need bmap.

--Stephen

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