Re: [patch] improve streaming I/O [bug in shrink_mmap()]

[Rik van Riel <riel@conectiva.com.br>]

On Wed, 14 Jun 2000, Andrea Arcangeli wrote:

> >and we can support all corner cases of usage well without it. In
> >fact, as I demonstrated above, even your own contorted example will
> >hang classzone if I only switch the order in which the allocations
> >happen...
> 
> It won't hang, but kswapd will eat CPU and that's right in your case. The
> difference that you can't see is that in the second scenario where the
> classzone would spend CPU in kswapd the CPU is spent for a purpose that
> have a sense. In the first scenario where classzone wouldn't any spend
> CPU, the CPU in kswapd would infact be _wasted_.

Now explain to me *why* this happens. I'm pretty sure this happens
because of the 'dispose = &old' in shrink_mmap and not because of
anything even remotely classzone related...

I'm trying to improve the Linux kernel here, I'd appreciate it if
you were honest with me.

regards,

Rik
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