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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/