linux-kernel - Re: [RFC][PATCH 3/5] add /dev/mem

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Message-Id: <20080116114121.11B7.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Wed, 16 Jan 2008 11:43:08 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	kosaki.motohiro@...fujitsu.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Marcelo Tosatti <marcelo@...ck.org>,
	Daniel Spang <daniel.spang@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH 3/5] add /dev/mem_notify device

Hi Alan

> > > It also appears there is no way to wait for memory shortages (processes
> > > that can free memory easily) only for memory to start appearing.
> > 
> > poll() with never timeout don't fill your requirement?
> > to be honest, maybe I don't understand your afraid yet. sorry.
> 
> My misunderstanding. There is in fact no way to wait for memory to become
> available. The poll() method you provide works nicely waiting for
> shortages and responding to them by freeing memory.
> 
> It would be interesting to add FASYNC support to this. Some users have
> asked for a signal when memory shortage occurs (as IBM AIX provides
> this). FASYNC support would allow a SIGIO to be delivered from this
> device when memory shortages occurred. Poll as you have implemented is of
> course the easier way for a program to monitor memory and a better
> interface.

OK.
I will challenge implement at mem_notify v5.


- kosaki


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