linux-kernel - Re: [PATCH 1/2] SCHED: Generic hooks for trapping task preemption

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Message-ID: <4695C092.4070609@qumranet.com>
Date:	Thu, 12 Jul 2007 08:48:02 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	kvm-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>, shaohua.li@...el.com
Subject: Re: [PATCH 1/2] SCHED: Generic hooks for trapping task preemption

Rusty Russell wrote:
> On Wed, 2007-07-11 at 18:55 +0300, Avi Kivity wrote:
>   
>> +	fire_sched_out_preempt_hooks(current);
>>    	prepare_lock_switch(rq, next);
>>  	prepare_arch_switch(next);
>>     
>
> Damn, I just found a use for this in lguest.
>
> Any chance of handing "next" to the sched_out hook so we can optimize
> the lguest <-> lguest switch?
>
> FYI, lguest turns off PGE globally when you load the module, because
> turning it off on each guest entry v. slow.  With these hooks I can be
> far smarter...
>   

Sure thang.  Will be there in the next version.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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