linux-kernel - Re: mmotm 2013-02-19-17-20 uploaded

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Date:	Thu, 21 Feb 2013 10:27:45 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Nathan Zimmer <nzimmer@....com>
CC:	akpm@...ux-foundation.org, mm-commits@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: mmotm 2013-02-19-17-20 uploaded

On 2/21/2013 10:18 AM, Nathan Zimmer wrote:
> On Thu, Feb 21, 2013 at 01:25:29AM -0800, Stephen Boyd wrote:
>> On 2/19/2013 5:21 PM, akpm@...ux-foundation.org wrote:
>>> * timer_list-split-timer_list_show_tickdevices.patch
>>> * timer_list-convert-timer-list-to-be-a-proper-seq_file.patch
>>> * timer_list-convert-timer-list-to-be-a-proper-seq_file-fix.patch
>>> * timer_list-convert-timer-list-to-be-a-proper-seq_file-v2.patch
>>> * timer_list-convert-timer-list-to-be-a-proper-seq_file-v2-fix.patch
>>> * timer_list-convert-timer-list-to-be-a-proper-seq_file-fix-fix.patch
>> These commits seem to break the timer list on devices with maxcpus !=
>> nr_cpu_ids, which is possible if you specify maxcpus on the kernel
>> command line. I no longer see the percpu devices that I normally have
>> after the broadcast device.
> Interesting.
> However I can't seem to boot at the moment with maxcpus set to less then the actual
> number of cpus so I am not having much luck investigating right now. 

It works well on ARM processors. I believe it still works on x86 devices
as well. I suppose you can simulate it by offlining a CPU and then
reading the file.

This comment is useful around the cpumask functions.

    Returns >= nr_cpu_ids if no further cpus set.

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