[PATCH] ARM: formalize an IPI for CPU wake-ups
From: Russell King - ARM Linux <hidden>
Date: 2012-06-11 18:41:48
On Mon, Jun 11, 2012 at 02:40:24PM -0400, Nicolas Pitre wrote:
On Mon, 11 Jun 2012, Russell King - ARM Linux wrote:quoted
On Mon, Jun 11, 2012 at 01:18:28PM -0400, Nicolas Pitre wrote:quoted
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.