From: Michael Schnell <mschnell@lumino.de>
Cc: linux-embedded@vger.kernel.org
Subject: Re: AMP on an SMP system
Date: Fri, 02 Aug 2013 18:00:02 +0200 [thread overview]
Message-ID: <51FBD782.9070309@lumino.de> (raw)
In-Reply-To: <51FBD223.9020809@gmail.com>
On 08/02/2013 05:37 PM, Marco Stornelli wrote:
>
> I don't know your hw so my consideration are really general.
The hardware is not decided yet (it will be some A9 thingy). So for me
"really general" is just fine.
> ISRs in rt kernel doesn't exist or at least the only work is to wake
> up the kernel thread for the management.
I see.
But how to determine the max latency for this ?
> The thing you can do is to move the kernel thread for interrupt X
> where you want to manage it, or you can set a specific scheduler
> policy. For example you can set a SCHED_FIFO with a very high priority
> for your "really low latency" tasks. RT kernel does the work for you
> :) You can see here: http://lwn.net/Articles/146861/
This seems be rather easy to do. If this is "good enough" latency wise,
it seems to be the way to go.
-Michael
next prev parent reply other threads:[~2013-08-02 16:00 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-02 8:33 AMP on an SMP system Michael Schnell
2013-08-02 11:42 ` Robert Schwebel
2013-08-02 12:13 ` Michael Schnell
2013-08-02 14:53 ` Marco Stornelli
2013-08-02 15:24 ` Michael Schnell
2013-08-02 15:37 ` Marco Stornelli
2013-08-02 16:00 ` Michael Schnell [this message]
2013-08-02 15:58 ` Marco Stornelli
2013-08-03 19:11 ` Robert Schwebel
2013-08-05 7:25 ` Michael Schnell
2013-08-05 8:17 ` Robert Schwebel
2013-08-05 9:04 ` Michael Schnell
2013-08-04 21:28 ` Lambrecht Jürgen
2013-08-05 7:36 ` Michael Schnell
2013-08-05 10:00 ` Lambrecht Jürgen
2013-08-07 8:23 ` Michael Schnell
2013-08-07 8:29 ` Michael Schnell
2013-08-07 9:04 ` Michael Schnell
2013-08-08 7:41 ` Michael Schnell
-- strict thread matches above, loose matches on Subject: below --
2013-08-02 16:16 Jon Sevy
2013-08-05 7:45 ` Michael Schnell
2013-08-05 8:21 ` Robert Schwebel
2013-08-05 8:42 ` Michael Schnell
2013-08-05 9:06 Guenter Ebermann
2013-08-05 9:34 ` Michael Schnell
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