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

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Message-ID: <20140511184808.GC15527@pd.tnic>
Date:	Sun, 11 May 2014 20:48:08 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Pavel Machek <pavel@....cz>,
	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, May 11, 2014 at 08:29:30PM +0200, Thomas Gleixner wrote:
> 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.

I think Pavel is missing the point: the delay will be removed with the
rewrite of cpu hotplug, after it actually works reliably. Then we won't
need delay anyway.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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