linux-kernel - Re: [PATCH] x86 rwsem optimization extreme

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Message-ID: <4B7CF95A.4040706@redhat.com>
Date:	Wed, 17 Feb 2010 22:24:58 -1000
From:	Zachary Amsden <zamsden@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	Avi Kivity <avi@...hat.com>
Subject: Re: [PATCH] x86 rwsem optimization extreme

>
> Zachary Amsden<zamsden@...hat.com>  writes
>> Incidentally, the cost of putting all the rwsem code inline, using the
>> straightforward approach, for git-tip, using defconfig on x86_64 is
>> 3565 bytes / 20971778 bytes total, or 0.0168%, using gcc 4.4.3.
>>      
> The nice advantage of putting lock code inline is that it gets
> accounted to the caller in all profilers.
>
> -Andi
>
>    

Unfortunately, only for the uncontended case.  The hot case still ends 
up in a call to the lock text section.

Zach
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