Re: journaling & VM

Rik van Riel
2000-06-07T22:29:16Z

On Wed, 7 Jun 2000, James Sutherland wrote:
> On Wed, 7 Jun 2000, Hans Reiser wrote:
>
> > Let me convey an aspect of its rightness.
> >
> > Caches have a declining marginal utility.
>
> Incidentally, this effect comes up in Andrew Schulman's book,
> Unauthorized Windows '95, in the section where he compares raw
> DOS, SmartDrive, Windows 3.1 with 32 bit disk access,

[SNIP]

The difference here is that those systems do NOT have a
unified VM. Also, mmap() isn't used for program data and
lots of other stuff we're doing isn't done on those
systems.

In a world where you mmap() your executables and major
parts of your program data, properly managing all the
caches *is* important...

regards,

Rik
--
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of people. That is its real strength.

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