linux-kernel - Re: Finding and chaniging registered clocksources

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Date:	Fri, 11 Dec 2009 08:06:39 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Ioannis Kyriakopoulos <johnkyr83@...mail.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: Finding and chaniging registered clocksources

On Fri, 11 Dec 2009, Ioannis Kyriakopoulos wrote:

> However, I don't know how to found out what clocksource Linux has assigned
> for other activities apart from the one mentioned (e.g. for timekeeping) and
> how to change it, if possible.

Depends on the subsystem. Code can use time sources as needed but in
general the standard clock is used as a common time base.

> For example, I want to find out which clocksource getnstimeofday() is using.
> It could be also useful if there is a way to see all the registered
> clocksources in the system.

getnstimeofday uses the syste, cllock that can be retrieved using
/sys/devices/system/clocksource/clocksource0/current_clocksource

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