Re: VM tuning

From: Andi Kleen (ak@suse.de)
Date: Sat Jun 10 2000 - 15:35:45 EST


On Sat, Jun 10, 2000 at 12:46:01PM +1000, Andrew Morton wrote:
> Andi Kleen wrote:
> >
> > Increasing /proc/sys/vm/freepages. That'll keep more memory for interrupts.
> >
>
> Andrey tells me he uses this file to create artificial out-of-memory
> conditions when testing drivers.
>
> I've poked various numbers in there but I can't seem to force an OOM
> condition in the driver. Having read the description in
> Documentation/sysctl/vm.txt it appears that I need to run another app
> which will exhaust vm...
>
> So. Could someone please tell me what to do to force an alloc_skb OOM
> condition within a network device driver?

Add

        if (net_random() % 20 == 0)
                return NULL;

on top of alloc_skb ?

-Andi

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