linux-kernel - Re: [PATCH 4/8] cpumask: convert kernel trace functions

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Message-Id: <200812202152.40124.rusty@rustcorp.com.au>
Date:	Sat, 20 Dec 2008 21:52:39 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Mike Travis <travis@....com>, Ingo Molnar <mingo@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/8] cpumask: convert kernel trace functions

On Saturday 20 December 2008 12:11:49 Steven Rostedt wrote:
> For future memory savings...
> 
> Acked-by: Steven Rostedt <srostedt@...hat.com>

Thanks for this Mike, this seems a significant enhancement over the
one in my tree (AFAICT I didn't do ring_buffer.c, nor use on_each_cpu).

I've updated the description, and removed one gratuitous indent change.
It's now in the linux-next section of my tree:

cpumask: convert kernel trace functions

Impact: Reduce future memory usage, use new cpumask API.

(Eventually, cpumask_var_t will be allocated based on nr_cpu_ids, not NR_CPUS).

Convert kernel trace functions to use struct cpumask API:
1) Use cpumask_copy/cpumask_test_cpu/for_each_cpu.
2) Use cpumask_var_t and alloc_cpumask_var/free_cpumask_var everywhere.
3) Use on_each_cpu instead of playing with current->cpus_allowed.

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
Signed-off-by: Mike Travis <travis@....com>
Acked-by: Steven Rostedt <rostedt@...dmis.org>
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