Re: 2.5.68-mm2

[Bill Davidsen <davidsen@tmr.com>]

On Wed, 23 Apr 2003, Benjamin LaHaise wrote:

> Actually, Ingo's rmap style sounds very similar to what I first implemented 
> in one of my stabs at rmap.  It has a nasty side effect of being worst case 
> for cache organisation -- the sister page tends to map to the exact same 
> cache line in some processors.  Whoops.  That said, I think that the rmap 
> pte-chains can really stand a bit of optimization by means of discarding a 
> couple of bits, as well as merging for adjacent pages, so I don't think 
> the overhead is a lost cause yet.  And nobody has written the clone() patch 
> for bash yet...

I'm not sure the best solution is to try to hack applications doing things
in the way they find best. I suspect that we have to change the kernel so
it handles the requests in a reasonable way.

Of course reasonable way may mean that bash does some things a bit slower,
but given that the whole thing works well in most cases anyway, I think
the kernel handling the situation is preferable.

-- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

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