linux-kernel - Re: [PATCH RESEND] powerpc/numa: initialize distance lookup table from drconf path

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Date:	Tue, 11 Aug 2015 15:25:17 +0530
From:	Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>
To:	linuxppc-dev@...ts.ozlabs.org, mpe@...erman.id.au
Cc:	anton@...ba.org, linux-kernel@...r.kernel.org,
	bharata@...ux.vnet.ibm.com
Subject: Re: [PATCH RESEND] powerpc/numa: initialize distance lookup table from drconf path


Hi Michael,

Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com> writes:
> In some situations, a NUMA guest that supports
> ibm,dynamic-memory-reconfiguration node will end up having flat NUMA
> distances between nodes. This is because of two problems in the
> current code.
>
> 1) Different representations of associativity lists.
>
>    There is an assumption about the associativity list in
>    initialize_distance_lookup_table(). Associativity list has two forms:
>
>    a) [cpu,memory]@x/ibm,associativity has following
>       format:
>            <N> <N integers>
>
>    b) ibm,dynamic-reconfiguration-memory/ibm,associativity-lookup-arrays
>
>            <M> <N> <M associativity lists each having N integers>
>            M = the number of associativity lists
>            N = the number of entries per associativity list
>
>    Fix initialize_distance_lookup_table() so that it does not assume
>    "case a". And update the caller to skip the length field before
>    sending the associativity list.
>
> 2) Distance table not getting updated from drconf path.
>
>    Node distance table will not get initialized in certain cases as
>    ibm,dynamic-reconfiguration-memory path does not initialize the
>    lookup table.
>
>    Call initialize_distance_lookup_table() from drconf path with
>    appropriate associativity list.
>
> Reported-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>
> Signed-off-by: Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>
> Acked-by: Anton Blanchard <anton@...ba.org>

Have you pulled this?

Regards,
Nikunj

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