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

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Message-ID: <482B5614.3060203@firstfloor.org>
Date:	Wed, 14 May 2008 23:13:56 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	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

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)

-Andi




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