Re: [PATCH UPDATED] percpu: use dynamic percpu allocator as the default percpu allocator

[Matthew Wilcox]

On Wed, Apr 01, 2009 at 12:39:46PM -0700, Linus Torvalds wrote:
> The thing is, things like "read_mostly" or "access_rarely" may talk about 
> how we access those individual variables, but you're missing a _huge_ 
> chunk of the puzzle if you ignore the _correlations_ of those accesses 
> with accesses to other variables.
> 
> The thign is, if you have variables 'a' and 'b', and they are always 
> accessed together, then it's probably worth it to put them in the same 
> cacheline.

If you've got two global variables that are generally accessed together,
they should probably be `annotated' as such by putting them in a struct.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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