Message-ID: <4B0C2445.2000008@klingt.org>
Date: Tue, 24 Nov 2009 19:21:57 +0100
From: Tim Blechmann <tim@klingt.org>
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To: Brian Gerst <brgerst@gmail.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/5] branch hint tweaks
References: <4B0BBB83.2020604@klingt.org> <73c1f2160911240950u7256feedqc475fa915dda43ca@mail.gmail.com>
In-Reply-To: <73c1f2160911240950u7256feedqc475fa915dda43ca@mail.gmail.com>
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> Did you run profiling tests again after making these changes to see if
> they had any effect?  likely() and unlikely() are only hints.  GCC
> doesn't have to follow them, or it could be broken in recent GCC
> versions.

i know, the compiler doesn't have to follow the hint ... but with the
likely/unlikely profiling, not the execution time is profiled, but
whether the branch hint is pointing to the right direction on my machine
=2E.. if the assembly is actually affected does probably depend on the
compiler version, instruction set, cpu tuning ...

tim

--=20
tim@klingt.org
http://tim.klingt.org

The aim of education is the knowledge, not of facts, but of values
  William S. Burroughs


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