From: Zachary Amsden <zamsden@redhat.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH] x86 rwsem optimization extreme
Date: Wed, 17 Feb 2010 22:24:58 -1000 [thread overview]
Message-ID: <4B7CF95A.4040706@redhat.com> (raw)
In-Reply-To: <87iq9v55em.fsf@basil.nowhere.org>
>
> Zachary Amsden<zamsden@redhat.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
next prev parent reply other threads:[~2010-02-18 8:25 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-17 21:58 [PATCH] x86 rwsem optimization extreme Zachary Amsden
2010-02-17 22:10 ` Linus Torvalds
2010-02-17 22:29 ` H. Peter Anvin
2010-02-17 23:29 ` H. Peter Anvin
2010-02-18 1:03 ` Zachary Amsden
2010-02-18 1:53 ` Linus Torvalds
2010-02-18 1:59 ` H. Peter Anvin
2010-02-18 4:25 ` Zachary Amsden
2010-02-18 8:12 ` Andi Kleen
2010-02-18 8:24 ` Zachary Amsden [this message]
2010-02-18 9:29 ` Andi Kleen
2010-02-18 10:55 ` Ingo Molnar
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