Re: RFC: THE OFFLINE SCHEDULER
[Posted September 2, 2009 by jake]
| From: |
| "Chris Friesen" <cfriesen-AT-nortel.com> |
| To: |
| Andrew Morton <akpm-AT-linux-foundation.org> |
| Subject: |
| Re: RFC: THE OFFLINE SCHEDULER |
| Date: |
| Wed, 26 Aug 2009 15:15:26 -0600 |
| Message-ID: |
| <4A95A5EE.90400@nortel.com> |
| Cc: |
| Christoph Lameter <cl-AT-linux-foundation.org>, mingo-AT-elte.hu,
peterz-AT-infradead.org, raziebe-AT-gmail.com, maximlevitsky-AT-gmail.com,
efault-AT-gmx.de, riel-AT-redhat.com, wiseman-AT-macs.biu.ac.il,
linux-kernel-AT-vger.kernel.org, linux-rt-users-AT-vger.kernel.org |
| Archive‑link: | |
Article |
On 08/26/2009 02:50 PM, Andrew Morton wrote:
> What problem?
>
> All I've seen is "I want 100% access to a CPU". That's not a problem
> statement - it's an implementation.
>
> What is the problem statement?
I can only speak for myself...
In our case the problem statement was that we had an inherently
single-threaded emulator app that we wanted to push as hard as
absolutely possible.
We gave it as close to a whole cpu as we could using cpu and irq
affinity and we used message queues in shared memory to allow another
cpu to handle I/O. In our case we still had kernel threads running on
the app cpu, but if we'd had a straightforward way to avoid them we
would have used it.
Chris
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