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Date: Wed, 29 Nov 2006 10:11:48 +0100
From: Jan Kiszka <jan.kiszka@domain.hid>
MIME-Version: 1.0
Subject: Re: [Xenomai-core] Re: [RFC][PATCH 1/2] rework shadow CPU affinity
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai-core <xenomai@xenomai.org>

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Gilles Chanteperdrix wrote:
> Jan Kiszka wrote:
>> Gilles Chanteperdrix wrote:
>>
>>> Jan Kiszka wrote:
>>>
>>>> Picking up the earlier discussion of CPU affinity of shadow threads,=

>>>> this patch now opens the possibility to assign a CPU mask on
>>>> xnshadow_map. It cleans up the related nucleus code and updates all
>>>> callers of xnshadow_map appropriately.
>>>>
>>>> Be warned, it's only tested on (q)emulated SMP. Comments and test
>>>> reports on real hardware are welcome.
>>> It is only possible to set the affinity of a user-space thread, why
>>> adding another way to do it ?
>>>
>>
>> I'm not yet completely understanding what you mean.
>>
>> So far the affinity was indirectly assigned to some xnthread by the CP=
U
>> the caller of xnshadow_map happened to run on. Now this is done
>> explicitly, thus in a more robust way (there was an undefined path in
>> the old code) and without duplicating code (/wrt skins).
>=20
> I meant "already" instead of "only", it is already possible to set the
> affinity of a user-space thread with sched_setaffinity.
>=20

OK. So you are suggesting to read out the affinity mask from task_struct
instead of passing it as an additional argument?


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