Re: control on cpu/core

[Lucas De Marchi]

On Fri, Apr 5, 2013 at 1:30 PM, christophe malvasio <arsdmthe@xxxxxxxxx> wrote:
> hi all
> i want to give the control of one core to a module
> that is the kernel have to not schedule/interrupt execution on this
> core and also my module have to be the only thing to send execution on
> this core
> i'm not sure if i can make it only from my module or if i must hack
> the kernel too ?
> fake core unplug or more coding ?
> give me your opinion ;)

You can isolate a core during boot so no process is scheduled to that
core. See "isolcpus=" in Documentation/kernel-parameters.txt.

I don't know what your module is doing so it might not be possible in
all scenarios. The only way I see is if your module created a kernel
thread. Then it can be moved to the isolated core by setting the cpu
mask. See for example how kworker, watchdog, migration do.

I'm CCing LKML to broaden your audience. linux-modules@xxxxxxxxxxxxxxx
is really low traffic and mostly intended for the module
loading/removal process, not really about writing modules.


Lucas De Marchi
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/