linux-kernel - Re: [PATCH][RFC] kvm-scheduler integration

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Message-ID: <4690FF37.7020801@qumranet.com>
Date:	Sun, 08 Jul 2007 18:13:59 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	kvm-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	shaohua.li@...el.com
Subject: Re: [PATCH][RFC] kvm-scheduler integration

Ingo Molnar wrote:
> * Avi Kivity <avi@...ranet.com> wrote:
>
>   
>>>> Won't that increase task_struct (16 bytes on 64-bit) unnecessarily?  
>>>> The function pointers are common to all virtual machines.
>>>>         
>>> well, this function pointer could then be reused by other virtual 
>>> machines as well, couldnt it?
>>>       
>> I don't get this.  If we add a couple of members to task_struct, it 
>> can't be reused.  The values will be the same across all tasks, but 
>> the memory will be gone (including tasks which aren't virtual 
>> machines).
>>     
>
> i mean, the function pointer is set by KVM, but it could be set to a 
> different value by other hypervisors.
>
>   

What other hypervisors? ;-)

Oh, if Rusty wants it for lguest I can put a pointer or a chain into 
task_struct.  But I doubt it -- with paravirtualization there are no 
costly new registers to swap.

> but ... no strong feelings either way, your patch is certainly fine.
>
> Acked-by: Ingo Molnar <mingo@...e.hu>
>   

Thanks!

-- 
error compiling committee.c: too many arguments to function

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