linux-kernel - [PATCH V2 2/3] pseries/findnodes: Find nodes with memory for memoryless nodes

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Date:   Wed, 18 Oct 2017 15:09:01 -0500
From:   Michael Bringmann <mwb@...ux.vnet.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Michael Bringmann <mwb@...ux.vnet.ibm.com>,
        John Allen <jallen@...ux.vnet.ibm.com>,
        Nathan Fontenot <nfont@...ux.vnet.ibm.com>,
        Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>,
        Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
Subject: [PATCH V2 2/3] pseries/findnodes: Find nodes with memory for
 memoryless nodes

pseries/findnodes: On pseries systems which allow 'hot-add' of
resources, we may boot configurations that have CPUs, but no memory
associated to a node by the affinity calculations.  Previously, the
software took a shortcut to collapse initialization and references
to such memoryless nodes with other nodes that did have memory
associated with them at boot.  This patch is based on fixes that
allow the proper initialization and distinguishment of memoryless
and memory-plus nodes after NUMA initialization.  It extends the
use of the 'node_to_mem_node()' API from 'topology.h' to modules
that are allocating node-specific memory at boot, and allows such
references to find available memory in another node.

Signed-off-by: Michael Bringmann <mwb@...ux.vnet.ibm.com>
---
 block/blk-mq-cpumap.c |    3 ++-
 mm/page_alloc.c       |    1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c
index 9f8cffc..a27a31f 100644
--- a/block/blk-mq-cpumap.c
+++ b/block/blk-mq-cpumap.c
@@ -73,7 +73,8 @@ int blk_mq_hw_queue_to_node(unsigned int *mq_map, unsigned int index)

 	for_each_possible_cpu(i) {
 		if (index == mq_map[i])
-			return local_memory_node(cpu_to_node(i));
+			return local_memory_node(
+					node_to_mem_node(cpu_to_node(i)));
 	}

 	return NUMA_NO_NODE;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 77e4d3c..e7aaa2a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4188,6 +4188,7 @@ struct page *

 	gfp_mask &= gfp_allowed_mask;
 	alloc_mask = gfp_mask;
+	preferred_nid = node_to_mem_node(preferred_nid);
 	if (!prepare_alloc_pages(gfp_mask, order, preferred_nid, nodemask, &ac, &alloc_mask, &alloc_flags))
 		return NULL;