From 576e85c5e92486f1aa8be3cb1a30cb59d4415981 Mon Sep 17 00:00:00 2001 From: Xianting Tian Date: Mon, 19 Oct 2020 16:20:47 +0800 Subject: [PATCH] blk-mq: remove the calling of local_memory_node() We don't need to check whether the node is memoryless numa node before calling allocator interface. SLUB(and SLAB,SLOB) relies on the page allocator to pick a node. Page allocator should deal with memoryless nodes just fine. It has zonelists constructed for each possible nodes. And it will automatically fall back into a node which is closest to the requested node. As long as __GFP_THISNODE is not enforced of course. The code comments of kmem_cache_alloc_node() of SLAB also showed this: * Fallback to other node is possible if __GFP_THISNODE is not set. blk-mq code doesn't set __GFP_THISNODE, so we can remove the calling of local_memory_node(). Signed-off-by: Xianting Tian Signed-off-by: Jens Axboe --- block/blk-mq-cpumap.c | 2 +- block/blk-mq.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c index 0157f2b3485a..3db84d3197f1 100644 --- a/block/blk-mq-cpumap.c +++ b/block/blk-mq-cpumap.c @@ -89,7 +89,7 @@ int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int index) for_each_possible_cpu(i) { if (index == qmap->mq_map[i]) - return local_memory_node(cpu_to_node(i)); + return cpu_to_node(i); } return NUMA_NO_NODE; diff --git a/block/blk-mq.c b/block/blk-mq.c index deca157032c2..615da7de8855 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2744,7 +2744,7 @@ static void blk_mq_init_cpu_queues(struct request_queue *q, for (j = 0; j < set->nr_maps; j++) { hctx = blk_mq_map_queue_type(q, j, i); if (nr_hw_queues > 1 && hctx->numa_node == NUMA_NO_NODE) - hctx->numa_node = local_memory_node(cpu_to_node(i)); + hctx->numa_node = cpu_to_node(i); } } }