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

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Message-ID: <84FF21A720B0874AA94B46D76DB98269045F7956@008-AM1MPN1-004.mgdnok.nokia.com>
Date:	Fri, 8 Jun 2012 07:49:06 +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 10:33
> To: Moiseichuk Leonid (Nokia-MP/Espoo)
.. 
> Wrong. CPU don't realized the running code belong to userspace or kernel.
> Every code just consume a power. That's why polling timer is wrong from
> point of power consumption view.
???
We are talking about different things.
User-space code could be dropped, distributed between several applications and has not deferred timers support.
For polling API the user-space code has to be executed quite often.
Localizing this code in kernel additionally allows to avoid vmsat/meminfo generation and parsing overhead as well.
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