From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: Daniel Walker <dwalker@mvista.com>
Cc: linuxppc-dev@ozlabs.org, tglx@linutronix.de, mingo@elte.hu,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver
Date: Fri, 18 May 2007 19:06:04 +0400 [thread overview]
Message-ID: <464DC0DC.7050809@ru.mvista.com> (raw)
In-Reply-To: <1179500217.20519.53.camel@imap.mvista.com>
Daniel Walker wrote:
>>I haven't looked at all the new clock/timer code, is there any
>>utility in having support for more than one clock source?
> There is if the main clocksource has some issues where it can't be used.
You mean, having more than one clocksource is *useful* in this case?
> On x86 there are lots of different issues with the clocks, so they have
> to get switches once in a while. For instance, if the TSC changes
> frequencies then it can't be used, or if the TSC stops in different
> power states , it can't be used..
Yeah, and there's the rating systems for both clock sources/events.
> Anything like that on PowerPC?
Well, the decrementer frequency may change, at least in theory (if the bus
clock changes).
> Daniel
WBR, Sergei
WARNING: multiple messages have this Message-ID (diff)
From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: Daniel Walker <dwalker@mvista.com>
Cc: Kumar Gala <galak@kernel.crashing.org>,
tglx@linutronix.de, mingo@elte.hu, linuxppc-dev@ozlabs.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver
Date: Fri, 18 May 2007 19:06:04 +0400 [thread overview]
Message-ID: <464DC0DC.7050809@ru.mvista.com> (raw)
In-Reply-To: <1179500217.20519.53.camel@imap.mvista.com>
Daniel Walker wrote:
>>I haven't looked at all the new clock/timer code, is there any
>>utility in having support for more than one clock source?
> There is if the main clocksource has some issues where it can't be used.
You mean, having more than one clocksource is *useful* in this case?
> On x86 there are lots of different issues with the clocks, so they have
> to get switches once in a while. For instance, if the TSC changes
> frequencies then it can't be used, or if the TSC stops in different
> power states , it can't be used..
Yeah, and there's the rating systems for both clock sources/events.
> Anything like that on PowerPC?
Well, the decrementer frequency may change, at least in theory (if the bus
clock changes).
> Daniel
WBR, Sergei
next prev parent reply other threads:[~2007-05-18 15:04 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-17 17:42 [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver Sergei Shtylyov
2007-05-17 17:47 ` Kumar Gala
2007-05-17 17:47 ` Kumar Gala
2007-05-17 18:07 ` Sergei Shtylyov
2007-05-17 18:07 ` Sergei Shtylyov
2007-05-17 18:17 ` Kumar Gala
2007-05-17 18:17 ` Kumar Gala
2007-05-17 18:26 ` Sergei Shtylyov
2007-05-17 18:26 ` Sergei Shtylyov
2007-05-17 18:31 ` Kumar Gala
2007-05-17 18:31 ` Kumar Gala
2007-05-17 18:42 ` Sergei Shtylyov
2007-05-17 18:42 ` Sergei Shtylyov
2007-05-18 12:39 ` Matt Sealey
2007-05-18 12:39 ` Matt Sealey
2007-05-18 13:45 ` Sergei Shtylyov
2007-05-18 13:45 ` Sergei Shtylyov
2007-05-18 14:28 ` Matt Sealey
2007-05-18 14:28 ` Matt Sealey
2007-05-18 14:48 ` Thomas Gleixner
2007-05-18 14:48 ` Thomas Gleixner
2007-05-18 15:37 ` Matt Sealey
2007-05-18 15:37 ` Matt Sealey
2007-05-18 16:31 ` Kumar Gala
2007-05-18 16:31 ` Kumar Gala
2007-05-18 16:50 ` Thomas Gleixner
2007-05-18 16:50 ` Thomas Gleixner
2007-05-18 16:55 ` Matt Sealey
2007-05-18 16:55 ` Matt Sealey
2007-05-18 16:52 ` Matt Sealey
2007-05-18 16:52 ` Matt Sealey
2007-07-10 10:52 ` Gabriel Paubert
2007-07-10 10:52 ` Gabriel Paubert
2007-07-10 14:24 ` Segher Boessenkool
2007-07-10 14:24 ` Segher Boessenkool
2007-07-10 23:31 ` Paul Mackerras
2007-07-10 23:31 ` Paul Mackerras
2007-07-11 0:10 ` Segher Boessenkool
2007-07-11 0:10 ` Segher Boessenkool
2007-05-18 20:27 ` David Miller
2007-05-18 20:27 ` David Miller
2007-05-18 14:56 ` Daniel Walker
2007-05-18 14:56 ` Daniel Walker
2007-05-18 15:06 ` Sergei Shtylyov [this message]
2007-05-18 15:06 ` Sergei Shtylyov
2007-05-18 15:39 ` Daniel Walker
2007-05-18 15:39 ` Daniel Walker
2007-05-18 15:48 ` Sergei Shtylyov
2007-05-18 15:48 ` Sergei Shtylyov
2007-05-19 3:33 ` Paul Mackerras
2007-05-19 3:33 ` Paul Mackerras
2007-05-20 2:43 ` Daniel Walker
2007-05-20 2:43 ` Daniel Walker
2007-05-20 3:03 ` Benjamin Herrenschmidt
2007-05-20 3:03 ` Benjamin Herrenschmidt
2007-05-20 15:03 ` Matt Sealey
2007-05-20 15:03 ` Matt Sealey
2007-05-20 21:25 ` Benjamin Herrenschmidt
2007-05-20 21:25 ` Benjamin Herrenschmidt
2007-05-20 16:02 ` Segher Boessenkool
2007-05-20 16:02 ` Segher Boessenkool
2007-05-20 21:26 ` Benjamin Herrenschmidt
2007-05-20 21:26 ` Benjamin Herrenschmidt
2007-05-17 19:27 ` Segher Boessenkool
2007-05-17 19:27 ` Segher Boessenkool
2007-05-17 19:43 ` Sergei Shtylyov
2007-05-17 19:43 ` Sergei Shtylyov
2007-05-17 19:50 ` Segher Boessenkool
2007-05-17 19:50 ` Segher Boessenkool
2007-05-17 20:00 ` Sergei Shtylyov
2007-05-17 20:00 ` Sergei Shtylyov
2007-05-17 20:53 ` Segher Boessenkool
2007-05-17 20:53 ` Segher Boessenkool
2007-05-18 5:04 ` Benjamin Herrenschmidt
2007-05-18 5:04 ` Benjamin Herrenschmidt
2007-05-18 5:39 ` Dave Liu
2007-05-18 5:39 ` Dave Liu
2007-05-18 7:08 ` Benjamin Herrenschmidt
2007-05-18 7:08 ` Benjamin Herrenschmidt
2007-05-18 13:41 ` Sergei Shtylyov
2007-05-18 13:41 ` Sergei Shtylyov
2007-05-18 13:48 ` Sergei Shtylyov
2007-05-18 23:27 ` Benjamin Herrenschmidt
2007-05-18 23:27 ` Benjamin Herrenschmidt
2007-05-18 23:49 ` Segher Boessenkool
2007-05-18 23:49 ` Segher Boessenkool
2007-05-19 0:13 ` Benjamin Herrenschmidt
2007-05-19 0:13 ` Benjamin Herrenschmidt
2007-05-30 15:56 ` Milton Miller
2007-05-19 3:34 ` Paul Mackerras
2007-05-19 3:34 ` Paul Mackerras
2007-05-24 18:25 ` [PATCH 2.6.21-rt7] PowerPC: fix clockevents for classic CPUs Sergei Shtylyov
2007-05-24 19:10 ` Segher Boessenkool
2007-05-24 19:10 ` Segher Boessenkool
2007-10-18 14:45 ` [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver Sergei Shtylyov
2007-10-18 14:45 ` Sergei Shtylyov
-- strict thread matches above, loose matches on Subject: below --
2007-05-18 3:24 Albert Cahalan
2007-05-18 14:52 ` Sergei Shtylyov
2007-05-18 14:52 ` Sergei Shtylyov
2007-05-19 1:45 ` Albert Cahalan
2007-05-19 1:45 ` Albert Cahalan
2007-05-19 12:28 ` Segher Boessenkool
2007-05-19 12:28 ` Segher Boessenkool
2007-05-19 18:22 ` Albert Cahalan
2007-05-19 18:22 ` Albert Cahalan
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