linux-kernel - Re: Dynamically determine if kernel includes CFS Scheduler

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Message-ID: <49B1BD2B.1040500@us.ibm.com>
Date:	Fri, 06 Mar 2009 16:17:47 -0800
From:	Darren Hart <dvhltc@...ibm.com>
To:	Sitsofe Wheeler <sitsofe@...oo.com>
CC:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	"lkml, " <linux-kernel@...r.kernel.org>
Subject: Re: Dynamically determine if kernel includes CFS Scheduler

Sitsofe Wheeler wrote:
> On Fri, Mar 06, 2009 at 03:01:14PM -0800, Darren Hart wrote:
>> So I am of course in agreement with both you and Peter.  In this case, 
>> the development team of an existing product is trying to move away from 
>> heavy use of sched_yield(), and the CFS scheduler provides some 
> 
> Hmm. The only thing I'll say about checking kernel versions is: do some
> tests/checks with the different enterprise distro kernels. I don't think
> they tend to do big backports any more but if they have that kernel
> version check could become tricky...

Right, excellent point.  Regardless of how thing are right now, relying 
on the kernel revision is a bad idea for this reason.

-- 
Darren Hart
IBM Linux Technology Center
Real-Time Linux Team
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