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Date: Thu, 21 Feb 2008 22:37:49 +0000
From: Ceri Davies <ceri@submonkey.net>
To: Robert Watson <rwatson@FreeBSD.org>
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Cc: Daniel Eischen <deischen@freebsd.org>, David Xu <davidxu@freebsd.org>,
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Subject: Re: getaffinity/setaffinity and cpu sets.
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On Thu, Feb 21, 2008 at 09:27:41AM +0000, Robert Watson wrote:

> - You don't mention what happens if a process's cpu set changes to preclu=
de a
>   CPU the process has a thread with affinity for.  Online, you suggested
>   SIGKILL, and I thought maybe a new SIGCPUGONE with a default SIGKILL ac=
tion
>   might be a friendlier model.  We should see what Solaris and others do =
here
>   though.  I like the idea that the affinity is a guarantee in userspace
>   because it means that you can rely on it; I'm OK with the idea that your
>   thread always runs on the CPUs you have affinity for unless in the
>   SIGCPUGONE handler :-).

If a processor set disappears from under a process on Solaris, the
process gets moved to the "default" set (or, in other words, they aren't
in a set any more).

Ceri
--=20
That must be wonderful!  I don't understand it at all.
                                                  -- Moliere

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