linux-kernel - Re: [announce] "kill the Big Kernel Lock (BKL)" tree

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Date:	Wed, 14 May 2008 14:16:41 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alexander Viro <viro@....linux.org.uk>
Subject: Re: [announce] "kill the Big Kernel Lock (BKL)" tree

Andi Kleen wrote:
> Alan Cox wrote:
>>> Most of the legacy users are unlikely to be latency problems,
>>> simply because only very few people (or nobody) still has that hardware
>>> and the code will never run.
>>>
>>> Also I wouldn't lose sleep over e.g. let ISDN continue using BKL forever.
>> Most 
> 
> Most?
> 
>> of the legacy users inflict that locking on other code - eg the ISN
>> use of the BKL directly impacts on the tty layer work.
> 
> So you just stick unlock_kernel()/lock_kernel() around the call
> to TTY (or similar to the entry points)
> 

... assuming that the ISDN code doesn't assume lock continuity across 
the TTY call.

	-hpa
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