RE: [PATCH v2 03/19] clocksource: Add NPS400 timers driver

From	Noam Camus <noamc@ezchip.com>
Newsgroups	linux.kernel
Subject	RE: [PATCH v2 03/19] clocksource: Add NPS400 timers driver
Date	2015-11-20 13:10 +0100
Message-ID	<qwSFP-71A-5@gated-at.bofh.it> (permalink)
References	<qpEeC-3hu-3@gated-at.bofh.it> <qs9QZ-1CF-19@gated-at.bofh.it> <qs9QZ-1CF-17@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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>From: Thomas Gleixner [mailto:tglx@linutronix.de] 
>Sent: Saturday, November 07, 2015 1:26 PM


>So that clocksource goes up to 1GHz. That means u32 fits ~4.29 seconds. Unless you are striving for NOHZ idle sleep times above that there is no point in doing that 64bit dance.
>
>The timekeeping code is perfectly fine with a 32bit value. You just have to set the proper mask.

We do it because we do indeed care very much for long NOHZ idle (and full) times on NPS, hence the song and dance.

-Noam


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RE: [PATCH v2 03/19] clocksource: Add NPS400 timers driver Noam Camus <noamc@ezchip.com> - 2015-11-20 13:10 +0100

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