linux-kernel - Re: [PATCH 1/2] scalable rw

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 12 May 2007 11:11:00 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andi Kleen <andi@...stfloor.org>,
	Christoph Lameter <clameter@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...sign.ru>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [PATCH 1/2] scalable rw_mutex

On Sat, 12 May 2007 11:06:24 -0700 Andrew Morton <akpm@...ux-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.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/