linux-kernel - Config Q?: Preempt Model & Preempt Big Kern Lock

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Message-ID: <4740C0BC.8010303@tlinx.org>
Date:	Sun, 18 Nov 2007 14:46:20 -0800
From:	Linda Walsh <lkml@...nx.org>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: Config Q?: Preempt Model & Preempt Big Kern Lock

Not big deal, just some config-validity questions regarding
i386 preemption models and preemption of the big-kern lock.
I.e. the relevant options are:

(PM) "Preemption model", there are 3 choices (i386):
      (none) No Forced Preemption (Server)
      (vol) Voluntary Preempt (Desktop)
      (full) Preemptible Kernel (Low-Latency Desktop)
(PBL) "Preempt The Big Kernel Lock" (hint: use Y for desktop, else N)

===
Are these all "valid" config states?  Should they all be valid?

I.e., does it make sense to allow "PM==none && PBL==T" ?
Does it makes sense to allow "(PM==full) && PBL==F" ?

Is the issue of big-kernel-lock preemption of major consequence
these days, or should it work in all cases?  Are there cases
where one might want PBL==F?  Would they be limited to the
"PM=none" case?

Is this the right place or way to ask such questions, or to
get information?

In asking a similar information question, it seems that it
was preferred that a bug be filed.  Is that the case here?

Thanks,
Lin

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