From: Andrew Morton <akpm@linux-foundation.org>
To: Andi Kleen <andi@firstfloor.org>,
Christoph Lameter <clameter@sgi.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Oleg Nesterov <oleg@tv-sign.ru>, Ingo Molnar <mingo@elte.hu>,
Thomas Gleixner <tglx@linutronix.de>,
Nick Piggin <npiggin@suse.de>
Subject: Re: [PATCH 1/2] scalable rw_mutex
Date: Sat, 12 May 2007 11:11:00 -0700 [thread overview]
Message-ID: <20070512111100.86ae13f6.akpm@linux-foundation.org> (raw)
In-Reply-To: <20070512110624.9ac3aa44.akpm@linux-foundation.org>
On Sat, 12 May 2007 11:06:24 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:
> We could put a cpumask in percpu_counter, initialise it to
> cpu_possible_map. Then, those callsites which have hotplug notifiers can
> call into new percpu_counter functions which clear and set bits in that
> cpumask and which drain percpu_counter.counts[cpu] into
> percpu_counter.count.
>
> And percpu_counter_sum() gets taught to do for_each_cpu_mask(fbc->cpumask).
Perhaps we could have a single cpu hotplug notifier in the percpu_counter
library. Add register/deregister functions to the percpu_counter API so
that all percpu_counters in the machine can be linked together.
One _could_ just register and deregister the counters in
percpu_counter_init() and percpu_counter_destroy(), but perhaps that
wouldn't suit all callers, dunno.
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next prev parent reply other threads:[~2007-05-12 18:11 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-11 13:15 [PATCH 0/2] convert mmap_sem to a " Peter Zijlstra
2007-05-11 13:15 ` [PATCH 1/2] " Peter Zijlstra
2007-05-11 14:03 ` Christoph Hellwig
2007-05-11 16:31 ` Andrew Morton
2007-05-11 17:07 ` Christoph Lameter
2007-05-11 18:05 ` Andrew Morton
2007-05-12 18:55 ` Andi Kleen
2007-05-12 18:06 ` Andrew Morton
2007-05-12 18:11 ` Andrew Morton [this message]
2007-05-16 23:28 ` Andrew Morton
2007-05-16 23:40 ` Christoph Lameter
2007-05-17 0:24 ` Andrew Morton
2007-05-12 18:12 ` Oleg Nesterov
2007-05-12 19:21 ` Andi Kleen
2007-05-12 21:42 ` Oleg Nesterov
2007-05-11 17:57 ` Peter Zijlstra
2007-05-11 23:00 ` Oleg Nesterov
2007-05-12 7:39 ` Peter Zijlstra
2007-05-12 13:41 ` Peter Zijlstra
2007-05-12 16:04 ` Oleg Nesterov
2007-05-12 16:57 ` Peter Zijlstra
2007-05-12 18:03 ` Oleg Nesterov
2007-05-14 10:59 ` Peter Zijlstra
2007-05-14 11:36 ` Nick Piggin
2007-05-15 0:36 ` Paul E. McKenney
2007-05-15 7:43 ` Peter Zijlstra
2007-05-15 15:29 ` Paul E. McKenney
2007-05-15 16:17 ` Peter Zijlstra
2007-05-15 18:52 ` Paul E. McKenney
2007-05-11 13:15 ` [PATCH 2/2] mm: change mmap_sem over to the " Peter Zijlstra
2007-05-11 16:17 ` Andrew Morton
2007-05-11 17:12 ` Peter Zijlstra
2007-05-11 18:08 ` Andrew Morton
2007-05-14 11:54 ` Nick Piggin
2007-05-11 15:56 ` [PATCH 0/2] convert mmap_sem to a " Ingo Molnar
2007-05-11 16:52 ` Eric Dumazet
2007-05-11 17:18 ` Peter Zijlstra
2007-05-14 12:07 ` Nick Piggin
2007-05-14 12:57 ` Peter Zijlstra
2007-05-11 17:08 ` Christoph Lameter
2007-05-14 11:58 ` Nick Piggin
2007-05-14 12:38 ` Peter Zijlstra
2007-05-12 9:27 ` Esben Nielsen
2007-05-12 10:01 ` Peter Zijlstra
2007-05-12 13:44 ` Esben Nielsen
2007-05-12 14:33 ` Ingo Molnar
2007-05-12 15:34 ` Esben Nielsen
2007-05-12 15:42 ` Ingo Molnar
2007-05-12 15:26 ` Eric Dumazet
2007-05-14 8:50 ` Esben Nielsen
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