Re: [RFC PATCH] powerpc/numa: initialize distance lookup table from drconf path

Nikunj A Dadhania
2015-06-10T05:08:55Z

Reworded commit log:

From: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>

powerpc/numa: initialize distance lookup table from drconf path

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@linux.vnet.ibm.com>
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
---
arch/powerpc/mm/numa.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 5e80621..8b9502a 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -225,7 +225,7 @@ static void initialize_distance_lookup_table(int nid,
for (i = 0; i < distance_ref_points_depth; i++) {
const __be32 *entry;

- entry = &associativity[be32_to_cpu(distance_ref_points[i])];
+ entry = &associativity[be32_to_cpu(distance_ref_points[i]) - 1];
distance_lookup_table[nid][i] = of_read_number(entry, 1);
}
}
@@ -248,8 +248,12 @@ static int associativity_to_nid(const __be32 *associativity)
nid = -1;

if (nid > 0 &&
- of_read_number(associativity, 1) >= distance_ref_points_depth)
- initialize_distance_lookup_table(nid, associativity);
+ of_read_number(associativity, 1) >= distance_ref_points_depth) {
+ /*
+ * Skip the length field and send start of associativity array
+ */
+ initialize_distance_lookup_table(nid, associativity + 1);
+ }

out:
return nid;
@@ -507,6 +511,12 @@ static int of_drconf_to_nid_single(struct of_drconf_cell *drmem,

if (nid == 0xffff || nid >= MAX_NUMNODES)
nid = default_nid;
+
+ if (nid > 0) {
+ index = drmem->aa_index * aa->array_sz;
+ initialize_distance_lookup_table(nid,
+ &aa->arrays[index]);
+ }
}

return nid;
--
1.8.3.1