linux-kernel - Re: [RFC 1/3] /dev/low_mem

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Message-ID: <4F16D79C.2020402@redhat.com>
Date:	Wed, 18 Jan 2012 09:30:52 -0500
From:	Rik van Riel <riel@...hat.com>
To:	leonid.moiseichuk@...ia.com
CC:	penberg@...nel.org, minchan@...nel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, kamezawa.hiroyu@...fujitsu.com,
	mel@....ul.ie, rientjes@...gle.com, kosaki.motohiro@...il.com,
	hannes@...xchg.org, mtosatti@...hat.com, akpm@...ux-foundation.org,
	rhod@...hat.com, kosaki.motohiro@...fujitsu.com
Subject: Re: [RFC 1/3] /dev/low_mem_notify

On 01/18/2012 04:06 AM, leonid.moiseichuk@...ia.com wrote:

> Would be possible to use for threshold pointed value(s) e.g. according to enum zone_state_item, because kinds of memory to track could be different?
> E.g. to tracking paging activity NR_ACTIVE_ANON and NR_ACTIVE_FILE could be interesting, not only free.

That seems like a horrible idea, because there is no guarantee that
the kernel will continue to use NR_ACTIVE_ANON and NR_ACTIVE_FILE
internally in the future.

What is exported to userspace must be somewhat independent of the
specifics of how the kernel implements things internally.

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