linux-kernel - [PATCH 3/3] mm/vmstat: simplfy extfrag_show_print with fragmentation

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Message-ID: <20240314005436.2962962-4-mcgrof@kernel.org>
Date: Wed, 13 Mar 2024 17:54:35 -0700
From: Luis Chamberlain <mcgrof@...nel.org>
To: akpm@...ux-foundation.org,
	jhubbard@...dia.com,
	vbabka@...e.cz,
	mgorman@...e.de,
	linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org,
	dave@...olabs.net,
	p.raghav@...sung.com,
	da.gomez@...sung.com,
	mcgrof@...nel.org
Subject: [PATCH 3/3] mm/vmstat: simplfy extfrag_show_print with fragmentation_index()

fragmentation_index() already uses the stack for the struct contig_page_info,
so just use that and enhance the documentation for fragmentation_index().

Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 mm/vmstat.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/mm/vmstat.c b/mm/vmstat.c
index db79935e4a54..582f89b37ccf 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1129,7 +1129,10 @@ unsigned int extfrag_for_order(struct zone *zone, unsigned int order)
 			info.free_pages);
 }
 
-/* Same as __fragmentation index but allocs contig_page_info on stack */
+/*
+ * Same as __fragmentation index but allocs contig_page_info on stack,
+ * useful when walking a zone as interrupts are disabled.
+ */
 int fragmentation_index(struct zone *zone, unsigned int order)
 {
 	struct contig_page_info info;
@@ -2227,15 +2230,11 @@ static void extfrag_show_print(struct seq_file *m,
 	unsigned int order;
 	int index;
 
-	/* Alloc on stack as interrupts are disabled for zone walk */
-	struct contig_page_info info;
-
 	seq_printf(m, "Node %d, zone %8s ",
 				pgdat->node_id,
 				zone->name);
 	for (order = 0; order < NR_PAGE_ORDERS; ++order) {
-		fill_contig_page_info(zone, order, &info);
-		index = __fragmentation_index(order, &info);
+		index = fragmentation_index(zone, order);
 		seq_printf(m, "%2d.%03d ", index / 1000, index % 1000);
 	}
 
-- 
2.43.0