Re: RFC: remove __read_mostly

[David Miller]

From: Adrian Bunk <bunk@xxxxxxxxxx>
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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