linux-kernel - Re: [git pull] cpus4096 fixes

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Message-ID: <488E130E.9060108@sgi.com>
Date:	Mon, 28 Jul 2008 11:42:22 -0700
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [git pull] cpus4096 fixes

Ingo Molnar wrote:
...
> NUMA-locality might have been a valid argument in favor of the massive 
> array of constant cpumasks (common usage is to use it for the current 
> cpu), if it wasnt all stupidly allocated on the boot node:
> 
>         cpumask_of_cpu_map = alloc_bootmem_low(sizeof(cpumask_t) * nr_cpu_ids);
>         for (i = 0; i < nr_cpu_ids; i++)
>                 cpu_set(i, cpumask_of_cpu_map[i]);

The alternate method was for each cpu to contribute a cpumask_of_cpu
for itself in the percpu area.  I don't recall why that idea was rejected.

But yes, the set_cpus_allowed is the biggest receiver of cpumask_t's with
a single bit set.  I had also proposed a different interface allowing just
that, but I think it was rejected as being redundant.

Thanks,
Mike
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