From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 00/15] Make SMP timers standalone
Date: Wed, 4 Jan 2012 21:47:48 +0000 [thread overview]
Message-ID: <20120104214748.GH11810@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <4F048EC4.40900@arm.com>
On Wed, Jan 04, 2012 at 05:39:16PM +0000, Marc Zyngier wrote:
> On 22/12/11 19:32, Russell King - ARM Linux wrote:
> > You're also aware I assume that local timers are different from the global
> > timer itself, and require to have additional callbacks for broadcasting
> > the global timer tick?
>
> I was under the impression that we either have the global timer together
> with broadcasting or the local timers. Completely removing the broadcast
> callback doesn't seem to generate any ill effect as long as the local
> timers are used instead of the global timer (which of course requires
> broadcast in the SMP configuration).
I believe even if you have local timers, there are situations where the
these will be disabled and the kernel will switch to broadcasting from a
global timer tick. I think such a scenario would be like that encountered
with OMAP, where suspending a CPU stops its TWD - meaning that the TWD
can't be used to wake the CPU from one of the deeper idle states.
next prev parent reply other threads:[~2012-01-04 21:47 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-22 17:27 [PATCH v2 00/15] Make SMP timers standalone Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 01/15] ARM: local timers: allow smp_twd to be used standalone Marc Zyngier
2011-12-22 20:38 ` Russell King - ARM Linux
2011-12-22 17:27 ` [PATCH v2 02/15] ARM: smp_twd: add device tree support Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 03/15] ARM: local timers: switch realview to standalone smp_twd Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 04/15] ARM: local timers: switch vexpress " Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 05/15] ARM: local timers: remove localtimer.c from plat-versatile Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 06/15] ARM: local timers: switch tegra to standalone smp_twd Marc Zyngier
2011-12-22 19:22 ` Colin Cross
2011-12-22 17:27 ` [PATCH v2 07/15] ARM: local timers: switch omap4 " Marc Zyngier
2011-12-23 6:37 ` Shilimkar, Santosh
2011-12-22 17:27 ` [PATCH v2 08/15] ARM: local timers: switch shmobile " Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 09/15] ARM: local timers: switch ux500 " Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 10/15] ARM: local timers: switch highbank " Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 11/15] ARM: local timers: switch imx6q " Marc Zyngier
2011-12-25 13:40 ` Shawn Guo
2011-12-22 17:27 ` [PATCH v2 12/15] ARM: smp_twd: remove support for non-standalone version Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 13/15] ARM: local timers: make MCT timer standalone Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 14/15] ARM: local timers: make MSM timers standalone Marc Zyngier
2011-12-22 17:27 ` [PATCH v2 15/15] ARM: local timers: Remove CONFIG_LOCAL_TIMERS support Marc Zyngier
2011-12-22 19:32 ` [PATCH v2 00/15] Make SMP timers standalone Russell King - ARM Linux
2012-01-04 17:39 ` Marc Zyngier
2012-01-04 21:47 ` Russell King - ARM Linux [this message]
2012-01-05 0:00 ` Linus Walleij
2012-01-05 11:08 ` Marc Zyngier
2012-01-05 11:13 ` Shilimkar, Santosh
2012-01-05 11:19 ` Marc Zyngier
2012-01-05 11:26 ` Russell King - ARM Linux
2012-01-05 11:35 ` Marc Zyngier
2012-01-05 12:10 ` Russell King - ARM Linux
2012-01-05 16:13 ` Marc Zyngier
2012-01-05 16:26 ` Russell King - ARM Linux
2012-01-05 16:55 ` Russell King - ARM Linux
2012-01-05 11:31 ` Shilimkar, Santosh
2012-01-05 10:33 ` Marc Zyngier
2012-01-05 10:45 ` Shilimkar, Santosh
2012-01-05 1:17 ` David Brown
2012-01-05 10:26 ` Linus Walleij
2012-01-05 11:01 ` Russell King - ARM Linux
2012-01-05 19:34 ` johlstei
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