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authorRaghavendra K T <raghavendra.kt@linux.vnet.ibm.com>2015-12-02 16:59:05 +0530
committerJens Axboe <axboe@fb.com>2015-12-03 09:56:27 -0700
commitbffed457160ab48282ca6d0d58646b3bbc2fa554 (patch)
treeecd8109a0c4061712846f43cc72b98396e959b78 /block
parente0e827b9fc71fbed1a9cd246067c2a4dbd3ea220 (diff)
downloadop-kernel-dev-bffed457160ab48282ca6d0d58646b3bbc2fa554.zip
op-kernel-dev-bffed457160ab48282ca6d0d58646b3bbc2fa554.tar.gz
blk-mq: Avoid memoryless numa node encoded in hctx numa_node
In architecture like powerpc, we can have cpus without any local memory attached to it (a.k.a memoryless nodes). In such cases cpu to node mapping can result in memory allocation hints for block hctx->numa_node populated with node values which does not have real memory. Instead use local_memory_node(), which is guaranteed to have memory. local_memory_node is a noop in other architectures that does not support memoryless nodes. Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Reviewed-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq-cpumap.c2
-rw-r--r--block/blk-mq.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c
index 8764c24..d0634bc 100644
--- a/block/blk-mq-cpumap.c
+++ b/block/blk-mq-cpumap.c
@@ -113,7 +113,7 @@ 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 cpu_to_node(i);
+ return local_memory_node(cpu_to_node(i));
}
return NUMA_NO_NODE;
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 35da318..6889d71 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1790,7 +1790,7 @@ static void blk_mq_init_cpu_queues(struct request_queue *q,
* not, we remain on the home node of the device
*/
if (nr_hw_queues > 1 && hctx->numa_node == NUMA_NO_NODE)
- hctx->numa_node = cpu_to_node(i);
+ hctx->numa_node = local_memory_node(cpu_to_node(i));
}
}
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