linux-kernel - Re: [patch] sched/fair: Move se->vruntime normalization state into struct sched

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Message-ID: <20160523122821.GI15728@worktop.ger.corp.intel.com>
Date:	Mon, 23 May 2016 14:28:21 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	Pavan Kondeti <pkondeti@...eaurora.org>,
	Ben Segall <bsegall@...gle.com>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Paul Turner <pjt@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>, byungchul.park@....com,
	Andrew Hunter <ahh@...gle.com>
Subject: Re: [patch] sched/fair: Move se->vruntime normalization state into
 struct sched_entity

On Mon, May 23, 2016 at 11:40:35AM +0200, Mike Galbraith wrote:

> Yup, bugs--.  Kinda funny, I considered ~this way first, but thought
> you'd not that approach.. dang, got it back-assward ;-)

Hehe, so the new flag is in a word we've already written to on this path
and it avoids growing the structure (by an undefined number of bytes,
see gripes about sizeof(bool)).

I am thinking of doing the thing you did for a debug aid -- then again;
if the Google guys would finally get the global vruntime patches sorted,
we can go and kill all this code.