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Date: Thu, 18 Feb 2010 10:29:07 +0100 From: Andi Kleen <andi@...stfloor.org> To: Zachary Amsden <zamsden@...hat.com> Cc: Andi Kleen <andi@...stfloor.org>, "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 On Wed, Feb 17, 2010 at 10:24:58PM -1000, Zachary Amsden wrote: >> >> 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. I removed those some time ago because it breaks unwinding. Did that get undone? -Andi -- ak@...ux.intel.com -- Speaking for myself only. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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