linux-kernel - Re: [PATCH v2] sched: let __sched_period() use rq's nr

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Message-ID: <1436771221.6576.60.camel@gmail.com>
Date:	Mon, 13 Jul 2015 09:07:01 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Byungchul Park <byungchul.park@....com>
Cc:	Morten Rasmussen <morten.rasmussen@....com>, mingo@...nel.org,
	peterz@...radead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] sched: let __sched_period() use rq's nr_running

On Mon, 2015-07-13 at 09:56 +0900, Byungchul Park wrote:

> and i agree with that it makes latency increase for non-grouped tasks.

It's not only a latency hit for the root group, it's across the board.

I suspect an overloaded group foo/bar/baz would prefer small slices over
a large wait as well. I certainly wouldn't want my root group taking the
potentially huge hits that come with stretching period to accommodate an
arbitrarily overloaded /foo/bar/baz.

	-Mike

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