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Date: Fri, 08 Feb 2002 10:54:33 -0800
From: Andrew Morton <akpm@zip.com.au>
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To: Linus Torvalds <torvalds@transmeta.com>
CC: Martin Wirth <Martin.Wirth@dlr.de>, Robert Love <rml@tech9.net>,
        linux-kernel@vger.kernel.org, mingo@elte.hu, haveblue@us.ibm.com
Subject: Re: [RFC] New locking primitive for 2.5
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Linus Torvalds wrote:
> 
> On Fri, 8 Feb 2002, Martin Wirth wrote:
> >
> > There are currently several attempts discussed to push out the
> > BKL and replace it by a semaphore e.g. the next step Robert Love
> > planned for his ll_seek patch (replace the BKL by inode i_sem).
> 
> But that won't have any contention anyway, so it's a non-issue.
> 

Yesterday, Ingo said:

> i think one example *could* be to turn inode->i_sem into a combi-lock. Eg.
> generic_file_llseek() could use the spin variant.
>
> this is a real performance problem, i've seen scheduling storms in
> dbench-type runs due to llseek taking the inode semaphore.

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