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Re: [PATCH 00/05] robust per_cpu allocation for modules

To: Steven Rostedt <>
Subject: Re: [PATCH 00/05] robust per_cpu allocation for modules
From: Nick Piggin <>
Date: Sat, 15 Apr 2006 15:32:10 +1000
Cc: LKML <>, Andrew Morton <>, Linus Torvalds <>, Ingo Molnar <>, Thomas Gleixner <>, Andi Kleen <>, Martin Mares <>,,,,, Chris Zankel <>, Marc Gauthier <>, Joe Taylor <>, David Mosberger-Tang <>,,,,,,,,,,,,,
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Steven Rostedt wrote:

 would now create a variable called per_cpu_offset__myint in
the .data.percpu_offset section.  This variable will point to the (if
defined in the kernel) __per_cpu_offset[] array.  If this was a module
variable, it would point to the module per_cpu_offset[] array which is
created when the modules is loaded.

If I'm following you correctly, this adds another dependent load
to a per-CPU data access, and from memory that isn't node-affine.

If so, I think people with SMP and NUMA kernels would care more
about performance and scalability than the few k of memory this

SUSE Labs, Novell Inc.
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