linux-kernel - [RFC 00/13] smp: reduce stack requirements for genapic send_IPI

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Date:	Sat, 06 Sep 2008 16:50:36 -0700
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	davej@...emonkey.org.uk, David Miller <davem@...emloft.net>,
	Eric Dumazet <dada1@...mosbay.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jack Steiner <steiner@....com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jes Sorensen <jes@....com>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: [RFC 00/13] smp: reduce stack requirements for genapic send_IPI_mask functions


[Note: all these changes require some more testing but I wanted to solicit
comments before then, hence the "RFC" in the subject line. -thanks! Mike]

  * Change the genapic->send_IPI_mask function to accept cpumask_t pointer.

  * Add for_each_online_cpu_mask_nr to eliminate a common case of needing
    a temporary on-stack cpumask_t variable.

  * Change send_IPI_mask function in xen to use for_each_online_cpu_mask_nr().

  * Add cpumask_ptr operations.

  * Add get_cpumask_var debug operations.

  * Add global allbutself PER_CPUMASK variable.

  * Remove as many on-stack cpumask_t variables in kernel/sched.c

  * Remove as many on-stack cpumask_t variables in acpi-cpufreq.c

  * Remove as many on-stack cpumask_t variables in io_apic.c


Applies to linux-2.6.tip/master.

Signed-off-by: Mike Travis <travis@....com>
---

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