From: Rusty Russell <rusty@rustcorp.com.au>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Mike Travis <travis@sgi.com>
Subject: Re: [git pull] cpus4096 fixes
Date: Mon, 28 Jul 2008 23:21:53 +1000 [thread overview]
Message-ID: <200807282321.53892.rusty@rustcorp.com.au> (raw)
In-Reply-To: <20080728081639.GA27708@elte.hu>
On Monday 28 July 2008 18:16:39 Ingo Molnar wrote:
> * Rusty Russell <rusty@rustcorp.com.au> wrote:
> > Mike: I now think the right long-term answer is Linus' dense cpumap
> > idea + a convenience allocator for cpumasks. We sweep the kernel for
> > all on-stack vars and replace them with one or the other. Thoughts?
>
> The dense cpumap for constant cpumasks is OK as it's clever, compact and
> static.
>
> All-dynamic allocator for on-stack cpumasks ... is a less obvious
> choice.
Sorry, I was unclear. "long-term" == "more than 4096 CPUs", since I thought
that was Mike's aim. If we only want to hack up 4k CPUS and stop, then I
understand the current approach.
If we want huge cpu numbers, I think cpumask_alloc/free gives the clearest
code. So our approach is backwards: let's do that *then* put ugly hacks in
if it's really too slow.
Cheers,
Rusty.
next prev parent reply other threads:[~2008-07-28 13:22 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
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 [this message]
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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