Re: [RFC][PATCH 3/5] add /dev/mem_notify device

[Alan Cox]

On Tue, 15 Jan 2008 19:59:02 +0900
KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> wrote:

> 
> > > the core of this patch series.
> > > add /dev/mem_notify device for notification low memory to user process.
> > 
> > As you only wake one process how would you use this API from processes
> > which want to monitor and can free memory under load. Also what fairness
> > guarantees are there...
> 
> Sorry, I don't make sense what you mean fairness.
> Could you tell more?

If you have two processes each waiting on mem_notify is it not possible
that one of them will keep being the one woken up and the other will
remain stuck ?

It also appears there is no way to wait for memory shortages (processes
that can free memory easily) only for memory to start appearing.
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