linux-kernel - Re: [PATCH] CPU hotplug: Slow down hotplug operations

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Message-ID: <alpine.DEB.2.02.1405112026580.6261@ionos.tec.linutronix.de>
Date:	Sun, 11 May 2014 20:29:30 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Pavel Machek <pavel@....cz>
cc:	Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Mel Gorman <mgorman@...e.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mike Galbraith <mgalbraith@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: Re: [PATCH] CPU hotplug: Slow down hotplug operations

On Sun, 11 May 2014, Pavel Machek wrote:
> Well. If you add the delay, you'll mask real problems and cause regressions when
> the delay is removed -- because fix-hotplug will probably take time to get right.
> 
> Bad idea, AFAICT.

Agreed, but Boris is right, that the current duct tape hackery needs
to stop. And the delay was the desperate attempt to wake up people to
focus on replacing the current mess instead of making it more
entangled.

Thanks,

	tglx
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