From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: formalize an IPI for CPU wake-ups
Date: Mon, 11 Jun 2012 19:41:48 +0100 [thread overview]
Message-ID: <20120611184148.GD18267@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <alpine.LFD.2.02.1206111430300.23555@xanadu.home>
On Mon, Jun 11, 2012 at 02:40:24PM -0400, Nicolas Pitre wrote:
> On Mon, 11 Jun 2012, Russell King - ARM Linux wrote:
>
> > On Mon, Jun 11, 2012 at 01:18:28PM -0400, Nicolas Pitre wrote:
> > > And that message certainly has to go as it may be triggered multiple
> > > times per second in some use cases here.
> >
> > That, I interpret, as an attempt to use CPU hotplugging for power
> > saving.
> >
> > No. Do not do that. Under any circumstances. Not only is the CPU
> > hotplugging code racy in places, it also totally destroys the ability
> > to have threads bound to CPUs, or even interrupts to CPUs.
>
> [ more comments ommitted ]
>
> Russell, let me suggest you take the time to read this:
>
> http://lwn.net/Articles/481055/
>
> then let's restart this conversation if you please.
Same comments apply for exactly the reasons I stated.
next prev parent reply other threads:[~2012-06-11 18:41 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-11 15:54 [PATCH] ARM: formalize an IPI for CPU wake-ups Nicolas Pitre
2012-06-11 15:57 ` Russell King - ARM Linux
2012-06-11 16:44 ` Nicolas Pitre
2012-06-11 16:51 ` Russell King - ARM Linux
2012-06-11 17:18 ` Nicolas Pitre
2012-06-11 17:41 ` Stephen Boyd
2012-06-11 19:25 ` Russell King - ARM Linux
2012-06-20 16:32 ` Stephen Boyd
2012-07-11 6:34 ` Kukjin Kim
2012-07-30 18:19 ` Stephen Boyd
2012-08-01 9:42 ` Kukjin Kim
2012-08-06 20:41 ` Colin Cross
2012-08-07 17:00 ` Russell King - ARM Linux
2012-08-08 7:04 ` Shilimkar, Santosh
2012-08-08 10:39 ` Kukjin Kim
2012-08-08 6:52 ` Magnus Damm
2012-08-13 22:09 ` Stephen Boyd
2012-08-22 19:05 ` Stephen Boyd
2012-08-22 21:23 ` Magnus Damm
2012-08-29 7:21 ` Stephen Boyd
2012-09-08 14:47 ` Nicolas Pitre
2012-06-11 18:26 ` Russell King - ARM Linux
2012-06-11 18:40 ` Nicolas Pitre
2012-06-11 18:41 ` Russell King - ARM Linux [this message]
2012-06-11 19:11 ` Nicolas Pitre
2012-06-11 19:20 ` Russell King - ARM Linux
2012-06-11 19:56 ` Nicolas Pitre
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