linux-kernel - Re: spinlocks -- why are releases inlined and acquires are not?

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Date:	Tue, 1 Apr 2008 14:40:49 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Andi Kleen <andi@...stfloor.org>
cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: spinlocks -- why are releases inlined and acquires are not?

On Tue, 1 Apr 2008, Andi Kleen wrote:

> At some point -- but that was before queued locks -- I noticed that for 
> i386 spin unlocks the call sequence for the sub function is actually 
> larger in code than the actual spin unlock operation and for x86-64 it 
> was about the same. 

spin unlocks seem to be properly inlined anyway, so that should be fine. 
My concern here is the non-inlining of spin locks, for which I don't think 
your argument above is also valid, right?

Thanks,

-- 
Jiri Kosina
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