linux-kernel - Re: [RFC] sched_clock: Track monotonic raw clock

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Message-ID: <20140718190602.GE3935@laptop>
Date:	Fri, 18 Jul 2014 21:06:02 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	John Stultz <john.stultz@...aro.org>
Cc:	Pawel Moll <pawel.moll@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Andy Lutomirski <luto@...capital.net>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Baruch Siach <baruch@...s.co.il>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] sched_clock: Track monotonic raw clock

On Fri, Jul 18, 2014 at 10:51:19AM -0700, John Stultz wrote:
> Very cool work! I've not been able to review it carefully, but one good
> stress test would be to pick a system where the hardware used for
> sched_clock is different from the hardware used for timekeeping.
> 
> Probably easily done on x86 hardware that normally uses the TSC, but has
> HPET/ACPI PM hardware available. After the system boots, change the
> clocksource via:
> /sys/devices/system/clocksource/clocksource0/current_clocksource

Note that x86 uses none of the code patched.
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