linux-kernel - Re: + paravirt-vmi-timer-patches.patch added to -mm tree

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Date:	Sat, 06 Jan 2007 12:37:12 -0800
From:	Zachary Amsden <zach@...are.com>
To:	Daniel Walker <dwalker@...sta.com>
CC:	linux-kernel@...r.kernel.org, ak@...e.de, chrisw@...s-sol.org,
	jeremy@...source.com, rusty@...tcorp.com.au
Subject: Re: + paravirt-vmi-timer-patches.patch added to -mm tree

Daniel Walker wrote:
> On Fri, 2006-12-15 at 14:27 -0800, akpm@...l.org wrote:
>   
>> +
>> +config NO_IDLE_HZ
>> +       bool
>> +       depends on PARAVIRT
>> +       default y
>> +       help
>> +         Switches the regular HZ timer off when the system is going
>> idle.
>> +         This helps a hypervisor detect that the Linux system is
>> idle,
>> +         reducing the overhead of idle systems. 
>>     
>
>
> There is already a dynamic tick (NO_HZ) system in the -mm tree .. Given
> that this implementation seems unnecessary. Why do you need another
> different system to do this?
>   

We don't.  This was written before the dynamic tick code, and now they 
need to be merged.  Until then, they can safely coexist.

Zach

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