linux-kernel - Re: [RFC PATCH] sched: make sure sched-priority after invoke idle

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Message-ID: <5302C8AB.8070401@linux.vnet.ibm.com>
Date:	Tue, 18 Feb 2014 10:42:51 +0800
From:	Michael wang <wangyun@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Juri Lelli <juri.lelli@...il.com>
Subject: Re: [RFC PATCH] sched: make sure sched-priority after invoke idle_balance()

On 02/17/2014 07:24 PM, Peter Zijlstra wrote:
[snip]
>> Since idle_balance() won't happen in the loop, may be we could use:
>>
>> 	if p && p->sched_class == class
>> 		return p
>>
>> in here, let it fall down into the loop if p is idle, since that means
>> we got RT/DL and will do this anyway, could save two jump work may be?
>> (and may could combine some code below if so?)
> 
> Maybe; we'd have to look at whatever GCC does with it. 

Exactly, alien code appear when in binary...

Regards,
Michael Wang

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