Re: [PATCH] percpu: add optimized generic percpu accessors

From: Ingo Molnar
Date: Tue Jan 20 2009 - 05:41:22 EST

* Rusty Russell <rusty@xxxxxxxxxxxxxxx> wrote:

> On Saturday 17 January 2009 08:38:32 Ingo Molnar wrote:
> > How do difficulties of dynamic percpu-alloc make my above suggestion
> > unsuitable for SNMP stats in networking? Most of those stats are not
> > dynamically allocated - they are plain straightforward percpu variables.
> No they're not. [...]

hm, i see this got changed recently - part of the networking stats went
over to the lib/percpu_counter API recently.

The larger point still remains: the kernel dominantly uses static percpu
variables by a margin of 10 to 1, so we cannot just brush away the static
percpu variables and must concentrate on optimizing that side with
priority. It's nice if the dynamic percpu-alloc side improves as well, of

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