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From: torvalds@transmeta.com (Linus Torvalds)
Subject: Re: [Lse-tech] lockmeter results comparing 2.4.17, 2.5.3, and 2.5.5
Date: Wed, 27 Feb 2002 21:31:17 +0000 (UTC)
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In article <3C7D3E5A.490D939D@zip.com.au>,
Andrew Morton  <akpm@zip.com.au> wrote:
>"Martin J. Bligh" wrote:
>> 
>> Seeing as people seem to be interested ... there are some big holders
>> of BKL around too - do_exit shows up badly (50ms in the data Hanna
>> posted, and I've seen that a lot before).
>
>That'll be where exit() takes down the tasks's address spaces.  
>zap_page_range().  That's a nasty one.

No, lock_kernel happens after exit_mm, and in fact I suspect it's not
really needed at all any more except for the current "sem_exit()". I
think most everything else is threaded already.

(Hmm.. Maybe disassociate_ctty() too).

So minimizing the BLK footprint in do_exit() should be pretty much
trivial: all the really interesting stuff should be ok already.

		Linus
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