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SubjectRe: [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@bugzilla.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@kernel-bugs.osdl.org
> ReportedBy: alex.shi@intel.com
> CC: yinghai@kernel.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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