From: Bill Davidsen <davidsen@tmr.com>
To: vatsa@in.ibm.com
Cc: Con Kolivas <kernel@kolivas.org>,
linux-kernel@vger.kernel.org, akpm@osdl.org,
ck list <ck@vds.kolivas.org>,
rmk+lkml@arm.linux.org.uk
Subject: Re: [PATCH 1/3] dynticks - implement no idle hz for x86
Date: Wed, 07 Sep 2005 12:14:55 -0400 [thread overview]
Message-ID: <431F11FF.2000704@tmr.com> (raw)
In-Reply-To: <20050905063229.GB4294@in.ibm.com>
Srivatsa Vaddagiri wrote:
> On Sun, Sep 04, 2005 at 10:48:13PM -0700, Nishanth Aravamudan wrote:
>
>>Admittedly, I don't think SMP ARM has been around all that long? Maybe
>>the existing code just has not been extended.
>
>
> Yeah, maybe ARM never cared for SMP. But we do care :)
>
>
>>I'm not sure on this. It's going to be NULL for other architectures, or
>>end up being called by the reprogram() call for the last CPU to go idle,
>>right (presuming there isn't a separate TOD source, like in x86). I
>>think it is better to be in the reprogram() interface.
>
>
> Non-x86 could have it set to NULL, in which case it doesn't get called.
> (I know the current code does not take care of this situation).
> But having an explicit 'all_cpus_idle' interface may be good, since
> Tony talked of idling some devices when all CPUs are idle. So it
> probably has non-x86/PIT uses too.
If this is intended to reduce power, and it originally came from that
root, then this is the time to put in a hook for transitions to<=>from
the all-idle state. Various arch may have things other than the PIT
which should (or at least can) be stopped, and which need to be restarted.
--
-bill davidsen (davidsen@tmr.com)
"The secret to procrastination is to put things off until the
last possible moment - but no longer" -me
next prev parent reply other threads:[~2005-09-07 16:08 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-31 16:58 Updated dynamic tick patches Srivatsa Vaddagiri
2005-08-31 17:12 ` [PATCH 1/3] Updated dynamic tick patches - Fix lost tick calculation in timer_pm.c Srivatsa Vaddagiri
2005-08-31 22:36 ` Zachary Amsden
2005-08-31 22:47 ` john stultz
2005-09-02 15:43 ` [PATCH 1/3] dynticks - implement no idle hz for x86 Con Kolivas
2005-09-02 15:45 ` [PATCH 2/3] dyntick - Fix lost tick calculation in timer pm.c Con Kolivas
2005-09-02 15:46 ` [PATCH 3/3] dyntick - Recover walltime upon wakeup Con Kolivas
2005-09-02 17:25 ` [PATCH 2/3] dyntick - Fix lost tick calculation in timer pm.c Srivatsa Vaddagiri
2005-09-02 20:18 ` Thomas Schlichter
2005-09-02 21:21 ` john stultz
2005-09-02 16:56 ` [PATCH 1/3] dynticks - implement no idle hz for x86 Russell King
2005-09-02 17:12 ` Srivatsa Vaddagiri
2005-09-03 6:13 ` Con Kolivas
2005-09-03 7:58 ` Russell King
2005-09-03 8:01 ` Con Kolivas
2005-09-03 8:06 ` Russell King
2005-09-03 8:14 ` Con Kolivas
2005-09-04 20:10 ` Nishanth Aravamudan
2005-09-04 20:26 ` Russell King
2005-09-04 20:37 ` Nishanth Aravamudan
2005-09-04 21:17 ` Russell King
2005-09-05 3:08 ` Con Kolivas
2005-09-05 16:28 ` Nishanth Aravamudan
2005-09-05 6:58 ` Tony Lindgren
2005-09-05 16:30 ` Nishanth Aravamudan
2005-09-04 20:41 ` Nishanth Aravamudan
2005-09-05 5:32 ` Srivatsa Vaddagiri
2005-09-05 5:48 ` Nishanth Aravamudan
2005-09-05 6:32 ` Srivatsa Vaddagiri
2005-09-05 6:44 ` Nishanth Aravamudan
2005-09-06 20:51 ` Nishanth Aravamudan
2005-09-07 8:13 ` Tony Lindgren
2005-09-07 15:00 ` Nishanth Aravamudan
2005-09-07 15:53 ` Nishanth Aravamudan
2005-09-07 17:07 ` Srivatsa Vaddagiri
2005-09-07 17:23 ` Nishanth Aravamudan
2005-09-07 18:14 ` Srivatsa Vaddagiri
2005-09-07 18:22 ` Nishanth Aravamudan
2005-09-07 16:14 ` Bill Davidsen [this message]
2005-09-07 16:42 ` Nish Aravamudan
2005-09-07 17:17 ` Srivatsa Vaddagiri
2005-09-07 17:27 ` Nish Aravamudan
2005-09-07 18:18 ` Srivatsa Vaddagiri
2005-09-07 18:33 ` Nish Aravamudan
2005-09-09 16:27 ` Bill Davidsen
2005-09-05 7:37 ` Russell King
2005-09-05 7:49 ` Srivatsa Vaddagiri
2005-09-05 8:00 ` Russell King
2005-09-05 16:33 ` Nishanth Aravamudan
2005-09-05 7:00 ` Srivatsa Vaddagiri
2005-09-05 7:27 ` Tony Lindgren
2005-09-05 17:02 ` Nishanth Aravamudan
2005-09-07 7:37 ` Tony Lindgren
2005-09-07 15:05 ` Nishanth Aravamudan
2005-09-08 10:00 ` Tony Lindgren
2005-09-08 21:22 ` Nishanth Aravamudan
2005-09-08 22:08 ` Nishanth Aravamudan
2005-09-09 22:30 ` Nishanth Aravamudan
2005-09-20 11:06 ` Srivatsa Vaddagiri
2005-09-20 14:58 ` Nishanth Aravamudan
2005-09-22 13:38 ` Martin Schwidefsky
2005-09-22 14:52 ` Nishanth Aravamudan
2005-09-22 18:32 ` Srivatsa Vaddagiri
2005-09-26 15:08 ` Srivatsa Vaddagiri
2005-09-23 6:55 ` Srivatsa Vaddagiri
2005-09-05 7:44 ` Russell King
2005-09-05 8:19 ` Srivatsa Vaddagiri
2005-09-05 8:32 ` Russell King
2005-09-05 9:24 ` Srivatsa Vaddagiri
2005-09-05 17:06 ` Nishanth Aravamudan
2005-09-05 17:04 ` Nishanth Aravamudan
2005-09-05 17:27 ` Srivatsa Vaddagiri
2005-09-05 18:06 ` Nishanth Aravamudan
2005-09-05 13:19 ` Srivatsa Vaddagiri
2005-09-05 16:57 ` Nishanth Aravamudan
2005-09-05 17:25 ` Srivatsa Vaddagiri
2005-09-05 18:11 ` Nishanth Aravamudan
2005-09-03 4:05 ` [PATCH 1/3] Updated dynamic tick patches - Fix lost tick calculation in timer_pm.c Lee Revell
2005-09-03 4:18 ` Peter Williams
2005-09-03 4:34 ` Lee Revell
2005-09-03 4:48 ` Peter Williams
2005-09-03 5:15 ` Parag Warudkar
2005-09-03 5:30 ` Lee Revell
2005-09-03 5:20 ` Srivatsa Vaddagiri
2005-09-06 10:32 ` Pavel Machek
2005-09-06 10:46 ` Srivatsa Vaddagiri
2005-09-06 18:04 ` john stultz
2005-08-31 17:26 ` [PATCH 2/3] Updated dynamic tick patches - Cleanup Srivatsa Vaddagiri
2005-08-31 17:27 ` [PATCH 3/3] Updated dynamic tick patches - Recover walltime upon wakeup Srivatsa Vaddagiri
2005-09-01 5:23 ` Updated dynamic tick patches Con Kolivas
2005-09-01 13:07 ` Tony Lindgren
2005-09-01 13:19 ` David Weinehall
2005-09-01 13:46 ` Tony Lindgren
2005-09-01 14:11 ` Srivatsa Vaddagiri
2005-09-02 17:34 ` Srivatsa Vaddagiri
2005-09-03 10:16 ` Tony Lindgren
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