linux-kernel - Re: [PATCH] Allocate module.ref array dynamically

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Date:	Wed, 12 Nov 2008 14:11:32 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
cc:	Eric Dumazet <dada1@...mosbay.com>, Takashi Iwai <tiwai@...e.de>,
	Andreas Gruenbacher <agruen@...e.de>,
	Jan Blunck <jblunck@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Mike Travis <travis@....com>
Subject: Re: [PATCH] Allocate module.ref array dynamically

On Wed, 12 Nov 2008, Rusty Russell wrote:

> You've introduced a third set of per-cpu primitives, yet the second set still
> has 0 users.

What second set?

> Your new basic interface is:
> CPU_ALLOC/CPU_FREE/CPU_PTR/THIS_CPU/__THIS_CPU
>
> I don't think the CAPS adds anything.  I'd like to see standard docbook
> comments.  It's not clear from your documentation whether this allocates for
> all possible or only all online CPUs, and the difference between THIS_CPU and
> __THIS_CPU is not immediately obvious.

The allocation is for all allocated percpu areas which is now per possible
cpu. The difference between THIS_CPU and __THIS_CPU is the context check
by smp_processor_id()

> How about re-using alloc_percpu/free_percpu/per_cpu_ptr APIs?  Rename THIS_CPU
> to __get_cpu_ptr and implement get_cpu_ptr and put_cpu_ptr wrappers (a-la
> get_cpu_var).

The caps functions are macros not functions. Macros are
capitalized. alloc_percpu must stay until the last remains have been
evicted. And the API does work differently.

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