From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [patch 00/16] arm: Replace arm sched_clock by clocksource based sched_clock
Date: Fri, 29 Apr 2011 10:46:06 +0100 [thread overview]
Message-ID: <20110429094606.GA5126@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20110423205036.795894921@linutronix.de>
On Sat, Apr 23, 2011 at 08:54:39PM -0000, Thomas Gleixner wrote:
> Most of ARM sched_clocks is using the timekeeping clocksource as the
> sched_clock. Only versatile uses a different clock for it, but there
> is no real reason why it can't use the clocksource as well.
sched_clock really needs to be setup earlier than clocksources are setup,
before sched_init() is called in init/main.c. This is where the scheduler
reads the initial value of sched_clock() to start its time measurements.
This is well before clocksources are initialized, or even the irq subsystem.
So I don't believe bolting it directly into the clocksource code in this
way is correct. As things are currently setup with my sched_clock()
implementation, we can (and in any cases do) get the sched_clock() up
and running really early which is what's required.
next prev parent reply other threads:[~2011-04-29 9:46 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-23 20:54 [patch 00/16] arm: Replace arm sched_clock by clocksource based sched_clock Thomas Gleixner
2011-04-23 20:54 ` [patch 01/16] time: Provide clocksource based sched_clock() Thomas Gleixner
2011-04-23 21:33 ` Stephen Boyd
2011-04-23 21:40 ` Thomas Gleixner
2011-04-25 7:10 ` Kukjin Kim
2011-04-26 16:36 ` Stephen Boyd
2011-04-23 20:54 ` [patch 02/16] arm: plat-orion: Use clocksource based sched_clock Thomas Gleixner
2011-04-23 20:54 ` [patch 03/16] arm: s5p: " Thomas Gleixner
2011-04-23 21:33 ` Stephen Boyd
2011-04-23 21:41 ` Thomas Gleixner
2011-04-25 7:08 ` Kukjin Kim
2011-04-23 20:54 ` [patch 04/16] arm: davinci: " Thomas Gleixner
2011-04-26 15:40 ` Nori, Sekhar
2011-04-23 20:54 ` [patch 05/16] arm: ixp4xx: " Thomas Gleixner
2011-04-23 20:54 ` [patch 06/16] arm: mmp: " Thomas Gleixner
2011-04-23 20:54 ` [patch 07/16] arm: omap: " Thomas Gleixner
2011-04-29 11:57 ` Tony Lindgren
2011-04-29 12:28 ` Thomas Gleixner
2011-04-29 12:51 ` Tony Lindgren
2011-04-29 14:19 ` Thomas Gleixner
2011-05-02 8:10 ` Tony Lindgren
2011-04-23 20:54 ` [patch 08/16] arm: pxa: " Thomas Gleixner
2011-04-25 16:25 ` Eric
2011-04-26 7:23 ` Sascha Hauer
2011-04-26 7:26 ` Eric Miao
2011-04-23 20:54 ` [patch 09/16] arm: sa1100: " Thomas Gleixner
2011-04-23 20:54 ` [patch 10/16] arm: tegra: " Thomas Gleixner
2011-04-23 20:54 ` [patch 11/16] arm: u300: " Thomas Gleixner
2011-04-24 7:03 ` Linus Walleij
2011-04-23 20:54 ` [patch 12/16] arm: plat-iop: " Thomas Gleixner
2011-04-23 20:54 ` [patch 13/16] arm plat-mxc: " Thomas Gleixner
2011-04-26 7:23 ` Sascha Hauer
2011-04-23 20:54 ` [patch 14/16] arm: nomadik: " Thomas Gleixner
2011-04-24 7:04 ` Linus Walleij
2011-04-23 20:54 ` [patch 15/16] arm: versatile: " Thomas Gleixner
2011-04-23 20:54 ` [patch 16/16] arm: Remove sched_clock code Thomas Gleixner
2011-04-25 7:11 ` Kukjin Kim
2011-04-24 7:27 ` [patch 00/16] arm: Replace arm sched_clock by clocksource based sched_clock Linus Walleij
2011-04-25 19:10 ` john stultz
2011-04-26 7:45 ` Linus Walleij
2011-04-26 8:50 ` Tony Lindgren
2011-04-26 8:02 ` Thomas Gleixner
2011-04-29 9:46 ` Russell King - ARM Linux [this message]
2011-04-29 10:22 ` Thomas Gleixner
2011-04-29 10:32 ` Tony Lindgren
2011-04-29 17:01 ` Thomas Gleixner
2011-04-29 21:53 ` Linus Walleij
2011-04-29 21:57 ` Thomas Gleixner
2011-05-02 8:18 ` Tony Lindgren
2011-05-08 20:34 ` Linus Walleij
2011-06-13 2:32 ` Rob Herring
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