From owner-freebsd-hackers@FreeBSD.ORG  Tue Nov 23 06:16:40 2010
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id A2534106564A
	for <freebsd-hackers@freebsd.org>; Tue, 23 Nov 2010 06:16:40 +0000 (UTC)
	(envelope-from avg@freebsd.org)
Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140])
	by mx1.freebsd.org (Postfix) with ESMTP id D96DA8FC1B
	for <freebsd-hackers@freebsd.org>; Tue, 23 Nov 2010 06:16:39 +0000 (UTC)
Received: from porto.topspin.kiev.ua (porto-e.starpoint.kiev.ua
	[212.40.38.100])
	by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id IAA11859
	for <freebsd-hackers@FreeBSD.org>; Tue, 23 Nov 2010 08:16:38 +0200 (EET)
	(envelope-from avg@freebsd.org)
Received: from localhost.topspin.kiev.ua ([127.0.0.1])
	by porto.topspin.kiev.ua with esmtp (Exim 4.34 (FreeBSD))
	id 1PKmBC-000CYX-6v
	for freebsd-hackers@FreeBSD.org; Tue, 23 Nov 2010 08:16:38 +0200
Message-ID: <4CEB5C4C.90003@freebsd.org>
Date: Tue, 23 Nov 2010 08:16:44 +0200
From: Andriy Gapon <avg@freebsd.org>
User-Agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-US;
	rv:1.9.2.12) Gecko/20101029 Lightning/1.0b2 Thunderbird/3.1.6
MIME-Version: 1.0
To: freebsd-hackers@freebsd.org
X-Enigmail-Version: 1.1.2
Content-Type: text/plain; charset=X-VIET-VPS
Content-Transfer-Encoding: 7bit
Subject: smp_rendezvous_cpus() vs sched_bind()
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 23 Nov 2010 06:16:40 -0000


If I need to call a function func on a specific CPU which one of the following I
should use?

1.
smp_rendezvous_cpus(1 << cpuid, ..., func, ...);

2.
sched_bind(cpuid);
func();
sched_unbind();

Or does it depend on some additional factors?
What are the main differences here?

And also by extension.
If I need to execute func() on all CPUs - which one is better again -
smp_rendezvous_cpus() or CPU_FOREACH+sched_bind?

Thanks a lot!
-- 
Andriy Gapon