linux-kernel - Re: [PATCH] sched: sync with the cfs

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Date:	Fri, 14 Aug 2015 10:46:52 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Yuyang Du <yuyang.du@...el.com>
Cc:	Byungchul Park <byungchul.park@....com>, mingo@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: sync with the cfs_rq when changing sched class

On Fri, Aug 14, 2015 at 07:20:20AM +0800, Yuyang Du wrote:
> sched: Provide sched class and priority change statistics to task
> 
> The sched class and priority changes make substantial impact for
> a task, but we really have not a quantitative understanding of how
> frequent they are, which makes it diffcult to work on many cases
> especially some corner cases. We privide it at task level.
> 
> Signed-off-by: Yuyang Du <yuyang.du@...el.com>

Sure we can do that. I would think its fairly rare on regular kernels,
whilst fairly common on -RT kernels where PI is much more active.
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