linux-kernel - RE: [PATCH 2/5] vmevent: Convert from deferred timer to deferred work

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Message-ID: <84FF21A720B0874AA94B46D76DB98269045F7918@008-AM1MPN1-004.mgdnok.nokia.com>
Date:	Fri, 8 Jun 2012 07:28:18 +0000
From:	<leonid.moiseichuk@...ia.com>
To:	<kosaki.motohiro@...il.com>
CC:	<anton.vorontsov@...aro.org>, <penberg@...nel.org>,
	<b.zolnierkie@...sung.com>, <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 2/5] vmevent: Convert from deferred timer to deferred
 work

> -----Original Message-----
> From: ext KOSAKI Motohiro [mailto:kosaki.motohiro@...il.com]
> Sent: 08 June, 2012 10:23
...
> > If you wakeup only by signal when memory situation changed you can be
> not mlocked.
> > Mlocking uses memory very inefficient way and usually cannot be applied
> for apps which wants to be notified due to resources restrictions.
> 
> That's your choice. If you don't need to care cache dropping, We don't
> enforce it. I only pointed out your explanation was technically incorrect.

My explanation is correct. That is an overhead you have to pay if start to use API based on polling from user-space and this overhead narrows API applicability.
Moving all times/tracking to kernel avoid useless wakeups in user-space.
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