linux-kernel - Re: RFC: remove __read

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Message-Id: <20071213.143246.175833292.davem@davemloft.net>
Date:	Thu, 13 Dec 2007 14:32:46 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	bunk@...nel.org
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: RFC: remove __read_mostly

From: Adrian Bunk <bunk@...nel.org>
Date: Thu, 13 Dec 2007 23:20:44 +0100

> My question is:
> Is there anywhere in the kernel a case where __read_mostly brings a 
> measurable improvement or can it be removed?

Yes, on SMP when read-mostly objects share cache lines
with other objects which are frequently written to.

That is the whole reason we created __read_mostly
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