linux-kernel - Re: useless node/has

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Date:	Thu, 15 Apr 2010 19:27:42 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Andreas Herrmann <herrmann.der.user@...glemail.com>
cc:	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: useless node/has_cpu sysfs attribute

On Thu, 15 Apr 2010, Andreas Herrmann wrote:

> commit 99dcc3e5a94ed491fbef402831d8c0bbb267f995 (this_cpu: Page
> allocator conversion) removed the call
>
>     node_set_state(node, N_CPU);    /* this node has a cpu */

This was moved to vmstat_cpuup_callback. See mm/vmstat.c. Maybe it needs
to be  added to setup_vmstat() as well.

> Thus the sysfs attribute /sys/devices/system/node/has_cpu doesn't
> show anything anymore.

Thats strange. Why is the cpuup notifier not executing?

> This attribute never reflected any changes triggered by CPU hotplug.

Duh some breakage in the cpuup notifier handling?

This needs to be fixed.
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