From: Alan <alan@lxorguk.ukuu.org.uk>
To: Zwane Mwaikambo <zwane@holomorphy.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@elte.hu>, Robert Love <rml@tech9.net>,
Andrew Morton <akpm@digeo.com>
Subject: Re: [PATCH][2.5] smp_call_function_mask
Date: 20 Jan 2003 23:19:05 +0000 [thread overview]
Message-ID: <1043104744.12609.2.camel@dhcp22.swansea.linux.org.uk> (raw)
In-Reply-To: <Pine.LNX.4.44.0301170014230.24250-100000@montezuma.mastecende.com>
On Fri, 2003-01-17 at 05:18, Zwane Mwaikambo wrote:
> + /* Wait for response */
> + while (atomic_read(&data.started) != num_cpus)
> + barrier();
Only old old intel x86 that does -bad- things as it
generates a lot of bus locked cycles. Better to do
while(atomic_read(&data.started) != num_cpus)
while(data.started.value != num_cpus)
{
barrier();
cpu_relax();
}
I would think ?
next prev parent reply other threads:[~2003-01-21 6:06 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-17 5:18 Zwane Mwaikambo
2003-01-17 5:44 ` Andrew Morton
2003-01-17 5:56 ` Zwane Mwaikambo
2003-01-20 23:19 ` Alan [this message]
2003-01-21 7:16 ` Zwane Mwaikambo
2003-01-21 7:13 Manfred Spraul
2003-01-21 8:07 ` Zwane Mwaikambo
2003-01-21 9:21 ` Zwane Mwaikambo
2003-01-21 17:13 ` Manfred Spraul
2003-01-21 17:49 ` Zwane Mwaikambo
2003-01-21 23:14 ` Alan Cox
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