Re: [patch?] Re: Do ramdisk exec's map direct to buffer cache?

From: Rik van Riel (
Date: Tue Aug 01 2000 - 17:32:45 EST

On Tue, 1 Aug 2000, Linus Torvalds wrote:
> On Tue, 1 Aug 2000, Rik van Riel wrote:
> >
> > But with this "fix" you'd be adding another one in the
> > process.
> >
> > Admitted, it's only a performance bug, but I found it to
> > grind the machine to an absolute halt when doing IO
> > intensive stuff or running large programs...
> Performance bugs are definitely secondary.

Agreed. However, this one is so big that you probably don't
want to go that way ;)

> > Stephen Tweedie, Andrea Arcangeli and me have been looking
> > at this bug and others and have found there's pretty much
> > NO WAY to fix this without some bigger changes in the VM
> > code.
> Quite frankly, nobody has convinced me that there any way to fix VM
> balancing issues even _if_ people were to re-write the VM.

Nobody asks of you that you read all your email. However, I
believe that most of the ideas for the new VM were CCd to
you ;)

> The fact is that I suspect that it is fundamentally impossible
> to balance the VM so that everybody is always happy. People
> should realize that making more changes in the hope of finally
> reaching some elusive goal is not always worthwhile.

Indeed, "just making some changes" won't work. In order to get
a nicely self-balancing VM you need to do some major overhauls
which are definately 2.5 issues.

> Right now I want things to _work_. Big VM changes are for 2.5.x anyway.
> (See 2.2.x for how playing with the VM can cause untold
> stability woes. I think Alan learned that the hard way).




"What you're running that piece of shit Gnome?!?!"
       -- Miguel de Icaza, UKUUG 2000

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