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

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Date:	Tue, 18 Aug 2015 13:18:58 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>
Cc:	linuxppc-dev@...ts.ozlabs.org, 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

On Tue, 2015-08-11 at 15:25 +0530, Nikunj A Dadhania wrote:
> 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?

Nope.

Will add it now.

cheers


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