From: tony@bakeyournoodle.com (Tony Breeds)
To: Daniel Walker <dwalker@mvista.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>, Ingo Molnar <mingo@elte.hu>,
john stultz <johnstul@us.ibm.com>,
LinuxPPC-dev <linuxppc-dev@ozlabs.org>
Subject: Re: [RFC] clocksouce implementation for powerpc
Date: Fri, 22 Jun 2007 16:23:05 +1000 [thread overview]
Message-ID: <20070622062305.GX9768@bakeyournoodle.com> (raw)
In-Reply-To: <1182351439.18168.79.camel@imap.mvista.com>
On Wed, Jun 20, 2007 at 07:57:19AM -0700, Daniel Walker wrote:
Hi Daniel.
> As I said in our private thread, I do think you should be using
> update_vsyscall() .. update_vsyscall() is just called when the time is
> set, usually that happens in the timer interrupt and sometimes that
> happens in settimeofday() ..
Well I've taken another look at the code and I think I can probably
restructure my code to use update_vsyscall(). I thought I needed a
hook that was called /only/ from settimeofday() (which as you say
doesn't match update_vsyscall()'s usage).
I'll try again and see what problems I hit.
> At least some of your code is duplications over what is already being
> worked on inside the powerpc community.. For instance, I know there is
> already a timebase clocksource,
>
> http://people.redhat.com/~mingo/realtime-preempt/patch-2.6.21.5-rt17
Thanks. The one in -rt doesn't seem to support the VDSO. however I see
that there is duplication of effort there.
> Hmm .. This doesn't look like it's taking into account that the time has
> changed .. Your time has effectively incremented by one jiffie .. The
> vdso_data doesn't appear to be updated ..
Unless I miss your meaning, the vdso is updated in
timer_recalc_offset()/update_gtod() when needed.
Yours Tony
linux.conf.au http://linux.conf.au/ || http://lca2008.linux.org.au/
Jan 28 - Feb 02 2008 The Australian Linux Technical Conference!
next prev parent reply other threads:[~2007-06-22 6:23 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-16 10:36 [patch-mm 00/25] High resolution timer updates and x86_64 support - V2 Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 01/25] NOHZ: Fix nox x86 dyntick idle handling Thomas Gleixner
2007-06-16 14:36 ` Bernhard Rosenkraenzer
2007-06-16 14:54 ` Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 02/25] ACPI: Move timer broadcast and pmtimer access before C3 arbiter shutdown Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 03/25] Clockevents remove prototypes of removed functions Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 04/25] Timekeeping: Fixup shadow variable argument Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 05/25] timer.c cleanup recently introduced whitespace damage Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 06/25] clockevents: Fix resume logic Thomas Gleixner
2007-06-16 18:51 ` Separate arch patching (Re: [patch-mm 06/25] clockevents: Fix resume logic) Oleg Verych
2007-06-16 19:04 ` Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 07/25] Tick management: spread timer interrupt Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 08/25] i386: PIT stop only, when in periodic or oneshot mode Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 09/25] clockevents: Fix device replacement Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 10/25] highres: Improve debug output Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 11/25] hrtimer: speedup hrtimer_enqueue Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 12/25] pcspkr: use the global PIT lock Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 13/25] i386: hpet assumes boot cpu is 0 Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 14/25] NTP: Move the cmos update code into ntp.c Thomas Gleixner
2007-06-19 8:26 ` Franck Bui-Huu
2007-06-16 10:36 ` [patch-mm 15/25] clocksource: add settimeofday hook for PPC Thomas Gleixner
2007-06-16 15:51 ` Daniel Walker
2007-06-20 6:57 ` [RFC] clocksouce implementation for powerpc Tony Breeds
2007-06-20 14:57 ` Daniel Walker
2007-06-20 17:20 ` Sergei Shtylyov
2007-06-20 17:31 ` Thomas Gleixner
2007-06-20 18:11 ` Sergei Shtylyov
2007-06-22 6:23 ` Tony Breeds [this message]
2007-06-20 16:53 ` Sergei Shtylyov
2007-06-22 6:10 ` Tony Breeds
2007-06-22 12:42 ` Sergei Shtylyov
2007-06-20 21:06 ` john stultz
2007-06-22 6:28 ` Tony Breeds
2007-06-16 10:36 ` [patch-mm 16/25] x86_64: untangle asm/hpet.h from asm/timex.h Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 17/25] x86_64: Use generic cmos update Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 18/25] i386: move setup_pit_timer to the correct header file Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 19/25] x86-64: remove dead code and other janitor work in tsc.c Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 20/25] x86_64: Convert to cleckevents Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 21/25] x86_64: hpet restore vread Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 22/25] x86_64: restore restore nohpet cmdline Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 23/25] x86-64 block irq balancing for timer Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 24/25] x86_64: prep idle loop for dynticks Thomas Gleixner
2007-06-16 10:36 ` [patch-mm 25/25] x86_64: enable high resolution timers and dynticks Thomas Gleixner
2007-06-16 14:41 ` [patch-mm 00/25] High resolution timer updates and x86_64 support - V2 Alistair John Strachan
2007-06-16 19:06 ` Thomas Gleixner
2007-06-16 23:04 ` Nigel Cunningham
2007-06-18 20:06 ` Valdis.Kletnieks
2007-06-18 20:24 ` Pallipadi, Venkatesh
2007-06-18 21:49 ` Valdis.Kletnieks
2007-06-18 22:10 ` Pallipadi, Venkatesh
2007-06-19 11:28 ` Valdis.Kletnieks
2007-06-19 1:52 ` Arjan van de Ven
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