From: Rusty Russell <rusty@rustcorp.com.au>
To: Tony Luck <tony.luck@gmail.com>,
"Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Venkatesh Pallipadi <venki@google.com>,
KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Mike Travis <travis@sgi.com>,
"Paul E. McKenney" <paul.mckenney@linaro.org>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
Paul Gortmaker <paul.gortmaker@windriver.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Avoid mask based num_possible_cpus and num_online_cpus -v5
Date: Tue, 14 Feb 2012 19:55:36 +1030 [thread overview]
Message-ID: <87wr7pbwbz.fsf@rustcorp.com.au> (raw)
In-Reply-To: <CA+8MBbLR+rcJqe2z9tAt7Oav4wqgZA3k8Te6zcXNOs+zv2wAaA@mail.gmail.com>
On Mon, 13 Feb 2012 13:57:45 -0800, Tony Luck <tony.luck@gmail.com> wrote:
> On Mon, Feb 13, 2012 at 12:44 PM, Srivatsa S. Bhat
> <srivatsa.bhat@linux.vnet.ibm.com> wrote:
> > IOW, what output do you see from the following printk from
> > arch/ia64/kernel/smpboot.c?
> >
> > printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
> > (int)num_online_cpus(), bogosum/(500000/HZ), (bogosum/(5000/HZ))%100);
>
> That is a complicated question - because linux-next also has patches
> by Arjan that
> change how (when) cpus are brought online. Initially I blamed his
> patches and tried
> reverting them ... and saw the symptom you are wondering about (message said
> "Total of 1 processors", but the BogoMIPs was a number big enough to be all of
> them. Thanks to you, I can now understand why.
>
> Fix will be to stop ia64 from messing directly with cpu_online_map?
Yes, and the other architectures.
We're well within reach of removing cpu_*_map now I think.
Cheers,
Rusty.
next prev parent reply other threads:[~2012-02-14 21:00 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-18 2:07 [PATCH] Avoid mask based num_possible_cpus and num_online_cpus Venkatesh Pallipadi
2012-01-18 5:55 ` KOSAKI Motohiro
2012-01-18 18:52 ` Venki Pallipadi
2012-01-18 19:20 ` KOSAKI Motohiro
2012-01-19 20:01 ` Venkatesh Pallipadi
2012-01-19 20:40 ` KOSAKI Motohiro
2012-01-21 1:01 ` Venki Pallipadi
2012-01-19 20:43 ` Srivatsa S. Bhat
2012-01-20 23:09 ` Venki Pallipadi
2012-01-20 23:45 ` KOSAKI Motohiro
2012-01-20 23:55 ` Venki Pallipadi
2012-01-23 5:22 ` Srivatsa S. Bhat
2012-01-23 19:28 ` Venki Pallipadi
2012-01-24 2:34 ` [PATCH] Avoid mask based num_possible_cpus and num_online_cpus -v3 Venkatesh Pallipadi
2012-01-24 19:22 ` Srivatsa S. Bhat
2012-01-24 19:30 ` KOSAKI Motohiro
2012-01-24 21:01 ` Venki Pallipadi
2012-01-24 23:25 ` [PATCH] Avoid mask based num_possible_cpus and num_online_cpus -v4 Venkatesh Pallipadi
2012-01-26 17:22 ` Srivatsa S. Bhat
2012-01-26 17:27 ` Srivatsa S. Bhat
2012-01-26 21:25 ` KOSAKI Motohiro
2012-01-26 23:22 ` Andrew Morton
2012-01-27 23:58 ` Venki Pallipadi
2012-02-01 0:17 ` [PATCH] Avoid mask based num_possible_cpus and num_online_cpus -v5 Venkatesh Pallipadi
2012-02-01 22:01 ` Andrew Morton
2012-02-02 20:03 ` Rusty Russell
2012-02-02 20:19 ` Andrew Morton
2012-02-02 21:00 ` Venki Pallipadi
2012-02-13 19:54 ` Tony Luck
2012-02-13 20:04 ` Venki Pallipadi
2012-02-13 20:25 ` Srivatsa S. Bhat
2012-02-13 20:43 ` Venki Pallipadi
2012-02-13 20:55 ` Srivatsa S. Bhat
2012-02-13 20:44 ` Srivatsa S. Bhat
2012-02-13 21:57 ` Tony Luck
2012-02-14 9:25 ` Rusty Russell [this message]
2012-02-14 21:35 ` Srivatsa S. Bhat
2012-02-14 23:00 ` Tony Luck
2012-02-14 22:49 ` [PATCH 0/3] Cleanup raw handling of online/possible map Venkatesh Pallipadi
2012-02-14 22:49 ` [PATCH 1/3] hexagon: Avoid raw handling of cpu_possible_map Venkatesh Pallipadi
2012-02-14 22:49 ` [PATCH 2/3] mips: Avoid raw handling of cpu_possible_map/cpu_online_map Venkatesh Pallipadi
2012-02-27 22:19 ` David Daney
2012-02-14 22:49 ` [PATCH 3/3] um: Avoid raw handling of cpu_online_map Venkatesh Pallipadi
2012-02-27 21:55 ` [PATCH] Avoid mask based num_possible_cpus and num_online_cpus -v5 David Daney
2012-02-27 22:07 ` Andrew Morton
2012-02-27 22:16 ` David Daney
2012-03-01 18:32 ` Venki Pallipadi
2012-02-28 5:01 ` Stephen Rothwell
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