Re: [patch] swap-speedup-2.4.3-B3 (fwd)

From: Mike Galbraith (
Date: Thu Apr 26 2001 - 06:59:10 EST

On Thu, 26 Apr 2001, Marcelo Tosatti wrote:

> On Thu, 26 Apr 2001, Mike Galbraith wrote:
> > > (i cannot see how this chunk affects the VM, AFAICS this too makes the
> > > zapping of the cache less agressive.)
> >
> > (more folks get snagged on write.. they can't eat cache so fast)
> What about GFP_BUFFER allocations ? :)
> I suspect the jiffies hack is avoiding GFP_BUFFER allocations to eat cache
> insanely.

(I think it's aging speed in general. If user tasks aren't doing it,
kswapd is.)

> Easy way to confirm that: add the kswapd wait queue again and make
> allocators which don't have __GFP_IO set wait on that in
> try_to_free_pages().

I've tried not allowing those to enter try_to_free_pages() [nogo].
I'll try a waitqueue. wait_event(waitqueue_active(&kswapd_wait)) ok?


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