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From: Daniel Walker <dwalker@fifo99.com>
To: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
	Thomas Gleixner <tglx@linutronix.de>,
	john stultz <johnstul@us.ibm.com>
Subject: Re: [RFC][patch 00/12] clocksource / timekeeping rework V2
Date: Wed, 29 Jul 2009 08:10:42 -0700	[thread overview]
Message-ID: <1248880242.28841.185.camel@desktop> (raw)
In-Reply-To: <20090729134125.313191633@de.ibm.com>

On Wed, 2009-07-29 at 15:41 +0200, Martin Schwidefsky wrote:
> There is still more room for improvement. Some sore points are:
> 
> 1) The cycle_last value still is in the struct clocksource. It should
>    be in the struct timekeeper but the check against cycles_last in
> the
>    read function of the TSC clock source makes it hard.
> 2) read_persistent_clock returns seconds. With a really good initial
>    time source this is not very precise. read_persistent_clock should
>    return a struct timespec.
> 3) xtime, raw_time, total_sleep_time, timekeeping_suspended, jiffies,
>    the ntp state and probably a few other values may be better located
>    in the struct timekeeper as well.


You could also consolidate the clocksource_unregister() path and the
clocksource_change_rating(0) path  , both are basically doing the same
thing.. Neither one is heavily used..

Daniel


  parent reply	other threads:[~2009-07-29 15:10 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-07-29 13:41 [RFC][patch 00/12] clocksource / timekeeping rework V2 Martin Schwidefsky
2009-07-29 13:41 ` [RFC][patch 01/12] introduce timekeeping_leap_insert Martin Schwidefsky
2009-07-30 21:02   ` john stultz
2009-07-29 13:41 ` [RFC][patch 02/12] remove clocksource inline functions Martin Schwidefsky
2009-07-29 14:15   ` Daniel Walker
2009-07-30 21:46     ` Christoph Hellwig
2009-07-30 21:05   ` john stultz
2009-07-29 13:41 ` [RFC][patch 03/12] cleanup clocksource selection Martin Schwidefsky
2009-07-29 13:41 ` [RFC][patch 04/12] clocksource watchdog highres enablement Martin Schwidefsky
2009-07-29 13:41 ` [RFC][patch 05/12] clocksource watchdog resume logic Martin Schwidefsky
2009-07-29 13:41 ` [RFC][patch 06/12] clocksource watchdog refactoring Martin Schwidefsky
2009-07-29 13:41 ` [RFC][patch 07/12] clocksource watchdog work Martin Schwidefsky
2009-07-29 13:41 ` [RFC][patch 08/12] introduce struct timekeeper Martin Schwidefsky
2009-07-29 13:41 ` [RFC][patch 09/12] add xtime_shift and ntp_error_shift to " Martin Schwidefsky
2009-07-30 22:15   ` john stultz
2009-07-31  8:13     ` Martin Schwidefsky
2009-07-29 13:41 ` [RFC][patch 10/12] move NTP adjusted clock multiplier " Martin Schwidefsky
2009-07-30 22:04   ` john stultz
2009-07-31  7:52     ` Martin Schwidefsky
2009-07-31  8:12       ` john stultz
2009-07-31  8:27         ` Martin Schwidefsky
2009-07-31  9:00         ` Martin Schwidefsky
2009-07-31 23:32           ` john stultz
2009-08-03  8:02             ` Martin Schwidefsky
2009-08-13 11:15   ` Linus Walleij
2009-08-13 11:23     ` Martin Schwidefsky
2009-07-29 13:41 ` [RFC][patch 11/12] timekeeper read clock helper functions Martin Schwidefsky
2009-07-30 21:39   ` john stultz
2009-07-31  7:45     ` Martin Schwidefsky
2009-07-31  8:11       ` john stultz
2009-07-29 13:41 ` [RFC][patch 12/12] update clocksource with stop_machine Martin Schwidefsky
2009-07-29 15:10 ` Daniel Walker [this message]
     [not found] <200907291510.n6TFAV8k000647@d06av06.portsmouth.uk.ibm.com>
2009-07-29 16:50 ` [RFC][patch 00/12] clocksource / timekeeping rework V2 Martin Schwidefsky
2009-07-29 17:02   ` Daniel Walker
     [not found] <200907291702.n6TH2LEt017305@d06av05.portsmouth.uk.ibm.com>
2009-07-29 17:09 ` Martin Schwidefsky
2009-07-29 17:17   ` Daniel Walker
2009-07-29 17:34   ` Daniel Walker
2009-07-30  7:42     ` Martin Schwidefsky
     [not found] <200907291717.n6THHG6f001426@d06av06.portsmouth.uk.ibm.com>
2009-07-30 10:53 ` Martin Schwidefsky
2009-07-30 12:49   ` Daniel Walker
2009-07-30 13:04     ` Martin Schwidefsky
2009-07-30 13:49       ` Daniel Walker
2009-07-30 17:16         ` john stultz
2009-07-30 18:08           ` Daniel Walker
2009-07-30 20:37             ` Andreas Mohr
2009-07-30 20:56             ` john stultz
2009-07-31  5:33               ` Daniel Walker
2009-07-31  8:34                 ` john stultz
2009-07-31 16:44                   ` Daniel Walker
2009-07-30 17:12   ` john stultz
     [not found] <200907301349.n6UDnCpx008890@d06av06.portsmouth.uk.ibm.com>
2009-07-30 15:42 ` Martin Schwidefsky

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