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Date:	Fri, 08 Jun 2012 02:57:47 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Pekka Enberg <penberg@...nel.org>
CC:	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Anton Vorontsov <cbouatmailru@...il.com>,
	Minchan Kim <minchan@...nel.org>,
	Leonid Moiseichuk <leonid.moiseichuk@...ia.com>,
	John Stultz <john.stultz@...aro.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	patches@...aro.org, kernel-team@...roid.com
Subject: Re: [PATCH 0/5] Some vmevent fixes...

(6/8/12 2:54 AM), Pekka Enberg wrote:
> On Fri, Jun 8, 2012 at 6:55 AM, KOSAKI Motohiro
> <kosaki.motohiro@...il.com>  wrote:
>>> For some cases, yes, but probably not for all.
>>>
>>> For example, if userspace doesn't know about "about to swap real soon"
>>> condition, it can continue to grow its caches making
>>> fallocate(VOLATILE) pretty much useless.
>>
>> Fair enough. But, Please consider your scenario don't need vmevent(2),
>> cat /proc/meminfo works enough. Only dropping activity need a quick work
>> and just in time notification. cache growing limitation don't need.
>
> Why do you keep bringing this up? Yes, you might get away with polling
> /proc/meminfo or /proc/vmstat for some specific cases. It does not
> make it a proper generic solution to the problem "vmevent" ABI tries
> to address.

Guys, current vmevent _is_ a polling interface. It only is wrapped kernel
timer.
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