From 6cf253925df72e522c06dac09ede7e81a6e38121 Mon Sep 17 00:00:00 2001 From: Bharata B Rao Date: Fri, 5 Nov 2021 13:40:18 -0700 Subject: [PATCH] mm/page_alloc: print node fallback order Patch series "Fix NUMA nodes fallback list ordering". For a NUMA system that has multiple nodes at same distance from other nodes, the fallback list generation prefers same node order for them instead of round-robin thereby penalizing one node over others. This series fixes it. More description of the problem and the fix is present in the patch description. This patch (of 2): Print information message about the allocation fallback order for each NUMA node during boot. No functional changes here. This makes it easier to illustrate the problem in the node fallback list generation, which the next patch fixes. Link: https://lkml.kernel.org/r/20210830121603.1081-1-bharata@amd.com Link: https://lkml.kernel.org/r/20210830121603.1081-2-bharata@amd.com Signed-off-by: Bharata B Rao Acked-by: Mel Gorman Reviewed-by: Anshuman Khandual Cc: KAMEZAWA Hiroyuki Cc: Lee Schermerhorn Cc: Krupa Ramakrishnan Cc: Sadagopan Srinivasan Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/page_alloc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 307ad23cb9e9..163f60dcac47 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -6262,6 +6262,10 @@ static void build_zonelists(pg_data_t *pgdat) build_zonelists_in_node_order(pgdat, node_order, nr_nodes); build_thisnode_zonelists(pgdat); + pr_info("Fallback order for Node %d: ", local_node); + for (node = 0; node < nr_nodes; node++) + pr_cont("%d ", node_order[node]); + pr_cont("\n"); } #ifdef CONFIG_HAVE_MEMORYLESS_NODES