Re: [PATCH] clocksource: Store reg field within struct clocksource

From	Russell King - ARM Linux <linux@arm.linux.org.uk>
Newsgroups	linux.kernel
Subject	Re: [PATCH] clocksource: Store reg field within struct clocksource
Date	2015-11-19 11:50 +0100
Message-ID	<qwuWS-88v-25@gated-at.bofh.it> (permalink)
References	<qwbhv-3zI-5@gated-at.bofh.it> <qweIq-60C-7@gated-at.bofh.it> <qwtR9-7uw-21@gated-at.bofh.it> <qwuNc-85h-23@gated-at.bofh.it> <qwuNd-85h-27@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, Nov 19, 2015 at 11:36:53AM +0100, Thomas Gleixner wrote:
> On Thu, 19 Nov 2015, Russell King - ARM Linux wrote:
> > Maybe the ____cacheline_aligned is inappropriate then, because it means
> > any wrapping of struct clocksource has exactly the same problem.
> 
> We could do that, but that does not necessarily solve the cache
> footprint issue. Aside of that we'd need to add ____cacheline_aligned
> to quite some of the statically allocated clocksource declarations.

Sorry, but it does solve the cache footprint issue, because it would
have the effect of moving 'reg' right into the same cache line as
the 'read' pointer.

Yes, we'd need ____cacheline_aligned at the static declarations, but
surely that's better than constantly having to stuff implementation
specific data into struct clocksource.

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Thread

[PATCH] clocksource: Store reg field within struct clocksource Marc Gonzalez <marc_gonzalez@sigmadesigns.com> - 2015-11-18 14:50 +0100
  Re: [PATCH] clocksource: Store reg field within struct clocksource Måns Rullgård <mans@mansr.com> - 2015-11-18 15:00 +0100
  Re: [PATCH] clocksource: Store reg field within struct clocksource Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-11-18 18:30 +0100
    Re: [PATCH] clocksource: Store reg field within struct clocksource Marc Gonzalez <marc_gonzalez@sigmadesigns.com> - 2015-11-19 10:40 +0100
      Re: [PATCH] clocksource: Store reg field within struct clocksource Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-11-19 11:40 +0100
        Re: [PATCH] clocksource: Store reg field within struct clocksource Thomas Gleixner <tglx@linutronix.de> - 2015-11-19 11:40 +0100
          Re: [PATCH] clocksource: Store reg field within struct clocksource Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-11-19 11:50 +0100
    Re: [PATCH] clocksource: Store reg field within struct clocksource Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-11-19 11:40 +0100
      Re: [PATCH] clocksource: Store reg field within struct clocksource Thomas Gleixner <tglx@linutronix.de> - 2015-11-19 11:50 +0100
        Re: [PATCH] clocksource: Store reg field within struct clocksource Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-11-19 12:10 +0100
          Re: [PATCH] clocksource: Store reg field within struct clocksource Thomas Gleixner <tglx@linutronix.de> - 2015-11-19 12:20 +0100
            Re: [PATCH] clocksource: Store reg field within struct clocksource Marc Gonzalez <marc_gonzalez@sigmadesigns.com> - 2015-11-19 13:30 +0100
              Re: [PATCH] clocksource: Store reg field within struct clocksource Thomas Gleixner <tglx@linutronix.de> - 2015-11-19 15:00 +0100
                Re: [PATCH] clocksource: Store reg field within struct clocksource Marc Gonzalez <marc_gonzalez@sigmadesigns.com> - 2015-11-24 13:40 +0100
            [tip:timers/core] timekeeping:   Lift clocksource cacheline restriction tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2015-11-25 22:40 +0100
      Re: [PATCH] clocksource: Store reg field within struct clocksource Marc Gonzalez <marc_gonzalez@sigmadesigns.com> - 2015-11-19 12:00 +0100
        Re: [PATCH] clocksource: Store reg field within struct clocksource Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-11-19 12:30 +0100
          Re: [PATCH] clocksource: Store reg field within struct clocksource Marc Gonzalez <marc_gonzalez@sigmadesigns.com> - 2015-11-19 13:50 +0100
    Re: [PATCH] clocksource: Store reg field within struct clocksource Thomas Gleixner <tglx@linutronix.de> - 2015-11-19 11:40 +0100

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