From: Mike Travis <travis@sgi.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Rusty Russell <rusty@rustcorp.com.au>
Subject: Re: [git pull] cpus4096 fixes
Date: Mon, 28 Jul 2008 11:42:22 -0700 [thread overview]
Message-ID: <488E130E.9060108@sgi.com> (raw)
In-Reply-To: <20080727210350.GA30033@elte.hu>
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
next prev parent reply other threads:[~2008-07-28 18:42 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-27 19:06 [git pull] cpus4096 fixes Ingo Molnar
2008-07-27 20:15 ` Linus Torvalds
2008-07-27 21:03 ` Ingo Molnar
2008-07-28 18:42 ` Mike Travis [this message]
2008-07-27 21:05 ` Al Viro
2008-07-27 22:17 ` Linus Torvalds
2008-07-28 0:42 ` Rusty Russell
2008-07-28 3:06 ` Andrew Morton
2008-07-28 6:34 ` Rusty Russell
2008-07-28 6:58 ` Nick Piggin
2008-07-28 7:56 ` Ingo Molnar
2008-07-28 18:12 ` Mike Travis
2008-07-28 8:33 ` Ingo Molnar
2008-07-28 18:07 ` Mike Travis
2008-07-28 17:50 ` Mike Travis
2008-07-28 18:32 ` Linus Torvalds
2008-07-28 18:37 ` Linus Torvalds
2008-07-28 18:51 ` Ingo Molnar
2008-07-28 19:22 ` Mike Travis
2008-07-28 19:31 ` Mike Travis
2008-07-28 19:04 ` Mike Travis
2008-07-28 20:57 ` [rfc git pull] cpus4096 fixes, take 2 Ingo Molnar
2008-07-28 21:35 ` Ingo Molnar
2008-07-28 21:41 ` [build error] drivers/char/pcmcia/ipwireless/hardware.c:571: error: invalid use of undefined type 'struct ipw_network' Ingo Molnar
2008-07-28 22:06 ` Ingo Molnar
2008-07-28 22:20 ` Andrew Morton
2008-07-28 22:29 ` Ingo Molnar
2008-07-30 14:59 ` David Sterba
2008-07-30 15:11 ` James Bottomley
2008-07-30 15:14 ` Jiri Kosina
2008-07-28 21:36 ` [rfc git pull] cpus4096 fixes, take 2 Mike Travis
2008-07-29 1:45 ` Rusty Russell
2008-07-29 12:11 ` Ingo Molnar
2008-07-30 0:15 ` Rusty Russell
2008-07-28 18:46 ` [git pull] cpus4096 fixes Mike Travis
2008-07-28 19:13 ` Ingo Molnar
2008-07-29 1:33 ` Rusty Russell
2008-07-28 0:53 ` Rusty Russell
2008-07-28 8:16 ` Ingo Molnar
2008-07-28 13:21 ` Rusty Russell
2008-07-28 18:23 ` Mike Travis
2008-07-31 10:30 ` Ingo Molnar
2008-07-28 8:43 ` Ingo Molnar
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