linux-kernel - Re: [PATCH 00/10][RFC] Increased clocksource validation and cleanups

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Message-ID: <20150112204553.GD4233@localhost.localdomain>
Date:	Mon, 12 Jan 2015 21:45:53 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...emonkey.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Prarit Bhargava <prarit@...hat.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"David S. Miller" <davem@...emloft.net>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH 00/10][RFC] Increased clocksource validation and cleanups

On Mon, Jan 12, 2015 at 10:22:11AM -0800, John Stultz wrote:
> Yea, I've not looked at the actual performance impact yet, but things
> like the read-time capping (which is in the hot path) could be put
> under a debug config. Thanks for the suggestion!

Having a broken clock is like having a broken memory card.  Both will
make your system behave very strangely.  Once you start having really
strange issues, you run a dedicated memory test.  That is why I would
expect to have clock validation as compile time option.

Thanks,
Richard
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