Re: [PATCH] Separate global/perzone inactive/free shortage

[Dave McCracken <dmc@austin.ibm.com>]

--On Wednesday, July 18, 2001 10:54:52 +0200 Mike Galbraith 
<mikeg@wen-online.de> wrote:

> Possible solution:
>
> Effectively reserving the last ~meg (pick a number, scaled by ramsize
> would be better) of ZONE_DMA for real GFP_DMA allocations would cure
> Dirk's problem I bet, and also cure most of the others too, simply by
> ensuring that the ONLY thing that could unbalance that zone would be
> real GFP_DMA pressure.  That way, you'd only eat the incredible cost
> of balancing that zone when it really really had to be done.

Couldn't something similar to this be accomplished by tweaking the 
pages_{min,low,high} values to ZONE_DMA based on the total memory in the 
machine?  It seems to me if you have a large memory machine it'd be simple 
enough to set at least pages_high (and perhaps pages_low?) to a larger 
value.  If we do this, won't it keep the DMA zone from triggering memory 
pressure as much?

Dave McCracken

======================================================================
Dave McCracken          IBM Linux Base Kernel Team      1-512-838-3059
dmc@austin.ibm.com                                      T/L   678-3059

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