linux-kernel - Re: [Bugme-new] [Bug 13690] New: nodes_clear cause hugepage unusable on non-NUMA machine

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Date:	Wed, 1 Jul 2009 18:34:52 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	alex.shi@...el.com
Cc:	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org, Yinghai Lu <Yinghai@...nel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [Bugme-new] [Bug 13690] New: nodes_clear cause hugepage
 unusable on non-NUMA machine


(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Thu, 2 Jul 2009 01:22:24 GMT bugzilla-daemon@...zilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=13690
> 
>            Summary: nodes_clear cause hugepage unusable on non-NUMA
>                     machine
>            Product: Platform Specific/Hardware
>            Version: 2.5
>     Kernel Version: 2.6.31-rc1
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: high
>           Priority: P1
>          Component: i386
>         AssignedTo: platform_i386@...nel-bugs.osdl.org
>         ReportedBy: alex.shi@...el.com
>                 CC: yinghai@...nel.org
>         Regression: Yes
> 
> 
> 73d60b7f747176dbdff826c4127d22e1fd3f9f74  commit introduced a nodes_clear
> function for NUMA machine. But seems the commit omits non-NUMA machine.
>  If find_zone_movable_pfns_for_nodes/early_calculate_totalpages has no
>  chance to run. nodes_clear will block HUPEPAGE using in my specjbb2005
>  testing on my Stoakely(i386/x86_64), waybridge(i386), IBM T61(i386)
> 
> +       /*
> +        * find_zone_movable_pfns_for_nodes/early_calculate_totalpages init
> +        * that node_mask, clear it at first
> +        */
> +       nodes_clear(node_states[N_HIGH_MEMORY]);

Thanks.

fyi, with recently-occurring bugs and regressions of this nature, it is (I
think) best to deal with them via email rather than bugzilla.  Bugzilla is
better-suited to longer-lived bugs where we have a need to track them,
generate statistics, etc.

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