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Date: Sun, 11 May 2014 20:48:08 +0200
From: Borislav Petkov <bp@alien8.de>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Pavel Machek <pavel@ucw.cz>, Andrew Morton <akpm@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
        Ingo Molnar <mingo@kernel.org>, Peter Zijlstra <peterz@infradead.org>,
        Mel Gorman <mgorman@suse.com>, Steven Rostedt <rostedt@goodmis.org>,
        Mike Galbraith <mgalbraith@suse.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Subject: Re: [PATCH] CPU hotplug: Slow down hotplug operations
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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.
--