From: Andi Kleen <ak@suse.de>
To: eranian@hpl.hp.com
Cc: Venki Pallipadi <venkatesh.pallipadi@intel.com>,
Adam Belay <abelay@novell.com>, "Rafael J. Wysocki" <rjw@sisk.pl>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, randy.dunlap@oracle.com,
lenb@kernel.org
Subject: Re: 2.6.21-rc6-mm1
Date: Wed, 11 Apr 2007 15:19:43 +0200 [thread overview]
Message-ID: <200704111519.43738.ak@suse.de> (raw)
In-Reply-To: <20070411130939.GA24875@frankl.hpl.hp.com>
>
> So my point is that you cannot use the PMU to account for wall-clock time when you
> go in halted state. Yet, you could use the idle notifier to compensate for it by
> recording let's say TSC prior to entry and computing delta on exit. But then I am
> not sure what you would do with it given that other events may or may not have
> counted during that time, making scaling harder to do.
I think correcting it with the TSC is fine. It might not be perfect, but it's
good enough for most uses. Certainly much better than idle=poll
> Once solution, implemented by Itanium Montecito processor, is to have a PMU event
> that counts cycles spent in halted state.
This solution is incompatible with aggressive power management.
-Andi
next prev parent reply other threads:[~2007-04-11 13:19 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-08 21:35 2.6.21-rc6-mm1 Andrew Morton
2007-04-09 11:13 ` 2.6.21-rc6-mm1 Borislav Petkov
2007-04-09 16:08 ` 2.6.21-rc6-mm1 Rafael J. Wysocki
2007-04-09 16:14 ` 2.6.21-rc6-mm1 Pallipadi, Venkatesh
2007-04-09 17:40 ` 2.6.21-rc6-mm1 Rafael J. Wysocki
2007-04-10 22:20 ` 2.6.21-rc6-mm1 Venki Pallipadi
2007-04-11 19:28 ` 2.6.21-rc6-mm1 Rafael J. Wysocki
2007-04-10 23:59 ` 2.6.21-rc6-mm1 Adam Belay
2007-04-11 0:15 ` 2.6.21-rc6-mm1 Venki Pallipadi
2007-04-11 5:20 ` 2.6.21-rc6-mm1 Stephane Eranian
2007-04-11 10:39 ` 2.6.21-rc6-mm1 Andi Kleen
2007-04-11 13:09 ` 2.6.21-rc6-mm1 Stephane Eranian
2007-04-11 13:19 ` Andi Kleen [this message]
2007-04-11 18:06 ` 2.6.21-rc6-mm1 Andrew Morton
2007-04-09 19:03 ` 2.6.21-rc6-mm1 Torsten Kaiser
2007-04-09 21:42 ` <linux/wait.h> uses definitions from <linux/sched.h> (was Re: 2.6.21-rc6-mm1) Stefan Richter
2007-04-09 22:01 ` Stefan Richter
2007-04-10 0:50 ` 2.6.21-rc6-mm1 Nishanth Aravamudan
2007-04-10 0:56 ` 2.6.21-rc6-mm1 Christoph Lameter
2007-04-10 1:07 ` 2.6.21-rc6-mm1 William Lee Irwin III
2007-04-10 11:28 ` 2.6.21-rc6-mm1 ima "BUG: held lock freed!" Joseph Fannin
2007-04-10 12:24 ` 2.6.21-rc6-mm1 Cornelia Huck
2007-04-10 12:38 ` 2.6.21-rc6-mm1 Ananth N Mavinakayanahalli
2007-04-10 14:09 ` [Ocfs2-devel] [RFC: -mm patch] fs/ocfs2/: make 3 functions static Adrian Bunk
2007-04-10 21:08 ` Adrian Bunk
2007-04-10 21:08 ` [-mm patch] make struct proc_kpagemap static Adrian Bunk
2007-04-10 21:09 ` Matt Mackall
2007-04-10 21:08 ` [-mm patch] make kernel/module.c:is_exported() static Adrian Bunk
2007-04-10 22:21 ` 2.6.21-rc6-mm1 aacraid not finding device Steve Fox
2007-04-13 12:35 ` [PATCH] aacraid: " Salyzyn, Mark
2007-04-13 12:35 ` Salyzyn, Mark
2007-04-16 15:21 ` [PATCH] aacraid: kzalloc Salyzyn, Mark
2007-04-11 19:42 ` 2.6.21-rc6-mm1 USB related boot hang Helge Hafting
2007-04-11 20:43 ` Andrew Morton
2007-04-11 23:07 ` Helge Hafting
2007-04-11 23:25 ` Andrew Morton
2007-04-12 7:50 ` Jiri Kosina
2007-04-12 8:02 ` Jiri Kosina
2007-04-12 11:42 ` Helge Hafting
2007-04-12 16:47 ` Andrew Morton
2007-04-12 18:56 ` Helge Hafting
2007-04-12 15:31 ` Jiri Kosina
2007-04-12 16:01 ` Corey Minyard
2007-04-12 16:55 ` Andrew Morton
2007-04-12 17:25 ` Greg KH
2007-04-12 17:49 ` Jiri Kosina
2007-04-12 17:58 ` Greg KH
2007-04-12 18:17 ` Jiri Kosina
2007-04-12 21:06 ` Corey Minyard
2007-04-12 20:19 ` Helge Hafting
2007-04-12 19:22 ` Helge Hafting
2007-04-12 18:32 ` Jiri Kosina
2007-04-12 20:25 ` Helge Hafting
2007-04-12 23:16 ` Jiri Kosina
2007-04-25 9:54 ` Helge Hafting
2007-04-25 11:28 ` Jiri Kosina
2007-04-25 12:45 ` Helge Hafting
2007-04-26 18:38 ` Helge Hafting
2007-04-26 22:28 ` 2.6.21-rc6-mm1 USB related boot hang - bisection result Helge Hafting
2007-04-26 22:39 ` Jiri Kosina
2007-04-26 23:13 ` Andrew Morton
2007-04-27 21:04 ` Helge Hafting
2007-04-27 22:41 ` Andrew Morton
2007-04-13 23:45 ` CPU_IDLE prevents resuming from STR [was: Re: 2.6.21-rc6-mm1] Mattia Dongili
2007-04-16 2:40 ` Shaohua Li
2007-04-17 2:50 ` Joshua Wise
2007-04-17 2:50 ` Shaohua Li
2007-04-17 6:47 ` Shaohua Li
2007-04-18 23:00 ` Joshua Wise
2007-04-19 1:05 ` Shaohua Li
2007-04-24 8:10 ` 2.6.21-rc6-mm1 J.A. Magallón
2007-04-24 11:58 ` 2.6.21-rc6-mm1 Andrew Morton
2007-04-24 13:43 ` 2.6.21-rc6-mm1 J.A. Magallón
2007-04-24 17:22 ` 2.6.21-rc6-mm1 Andrew Morton
2007-04-25 20:50 ` 2.6.21-rc6-mm1 J.A. Magallón
2007-04-25 21:39 ` start_udev and devpts [Re: 2.6.21-rc6-mm1] J.A. Magallón
2007-04-25 22:26 ` J.A. Magallón
-- strict thread matches above, loose matches on Subject: below --
2007-04-08 21:35 2.6.21-rc6-mm1 Andrew Morton
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