+ mm-page_alloc-print-node-fallback-order.patch added to -mm tree

+ mm-page_alloc-print-node-fallback-order.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm/page_alloc: print node fallback order
has been added to the -mm tree.  Its filename is
     mm-page_alloc-print-node-fallback-order.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-page_alloc-print-node-fallback-order.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-page_alloc-print-node-fallback-order.patch

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------------------------------------------------------
From: Bharata B Rao <bharata@amd.com>
Subject: 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 <bharata@amd.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Krupa Ramakrishnan <krupa.ramakrishnan@amd.com>
Cc: Sadagopan Srinivasan <Sadagopan.Srinivasan@amd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/page_alloc.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/mm/page_alloc.c~mm-page_alloc-print-node-fallback-order
+++ a/mm/page_alloc.c
@@ -6256,6 +6256,10 @@ static void build_zonelists(pg_data_t *p
 
 	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
_

Patches currently in -mm which might be from bharata@amd.com are

mm-page_alloc-print-node-fallback-order.patch