linux-kernel - [PATCH v5 11/14] testing/radix-tree/maple: Increase readers and reduce delay for faster machines

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Message-Id: <20250723-slub-percpu-caches-v5-11-b792cd830f5d@suse.cz>
Date: Wed, 23 Jul 2025 15:34:44 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Suren Baghdasaryan <surenb@...gle.com>, 
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, 
 Christoph Lameter <cl@...two.org>, David Rientjes <rientjes@...gle.com>
Cc: Roman Gushchin <roman.gushchin@...ux.dev>, 
 Harry Yoo <harry.yoo@...cle.com>, Uladzislau Rezki <urezki@...il.com>, 
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, rcu@...r.kernel.org, 
 maple-tree@...ts.infradead.org, vbabka@...e.cz, 
 "Liam R. Howlett" <howlett@...il.com>
Subject: [PATCH v5 11/14] testing/radix-tree/maple: Increase readers and
 reduce delay for faster machines

From: "Liam R. Howlett" <howlett@...il.com>

Add more threads and reduce the timing of the readers to increase the
possibility of catching the rcu changes.  The test does not pass unless
the reader is seen.

Signed-off-by: Liam R. Howlett <howlett@...il.com>
Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
---
 tools/testing/radix-tree/maple.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/tools/testing/radix-tree/maple.c b/tools/testing/radix-tree/maple.c
index 2c0b3830125336af760768597d39ed07a2f8e92b..f6f923c9dc1039997953a94ec184c560b225c2d4 100644
--- a/tools/testing/radix-tree/maple.c
+++ b/tools/testing/radix-tree/maple.c
@@ -35062,7 +35062,7 @@ void run_check_rcu_slowread(struct maple_tree *mt, struct rcu_test_struct *vals)

 	int i;
 	void *(*function)(void *);
-	pthread_t readers[20];
+	pthread_t readers[30];
 	unsigned int index = vals->index;

 	mt_set_in_rcu(mt);
@@ -35080,14 +35080,14 @@ void run_check_rcu_slowread(struct maple_tree *mt, struct rcu_test_struct *vals)
 		}
 	}

-	usleep(5); /* small yield to ensure all threads are at least started. */
+	usleep(3); /* small yield to ensure all threads are at least started. */

 	while (index <= vals->last) {
 		mtree_store(mt, index,
 			    (index % 2 ? vals->entry2 : vals->entry3),
 			    GFP_KERNEL);
 		index++;
-		usleep(5);
+		usleep(2);
 	}

 	while (i--)
@@ -35098,6 +35098,7 @@ void run_check_rcu_slowread(struct maple_tree *mt, struct rcu_test_struct *vals)
 	MT_BUG_ON(mt, !vals->seen_entry3);
 	MT_BUG_ON(mt, !vals->seen_both);
 }
+
 static noinline void __init check_rcu_simulated(struct maple_tree *mt)
 {
 	unsigned long i, nr_entries = 1000;

-- 
2.50.1