linux-kernel - [PATCH v2 5/6] maple_tree: Update check_forking() and bench

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Date:   Wed, 30 Aug 2023 20:56:53 +0800
From:   Peng Zhang <zhangpeng.00@...edance.com>
To:     Liam.Howlett@...cle.com, corbet@....net, akpm@...ux-foundation.org,
        willy@...radead.org, brauner@...nel.org, surenb@...gle.com,
        michael.christie@...cle.com, peterz@...radead.org,
        mathieu.desnoyers@...icios.com, npiggin@...il.com, avagin@...il.com
Cc:     linux-mm@...ck.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Peng Zhang <zhangpeng.00@...edance.com>
Subject: [PATCH v2 5/6] maple_tree: Update check_forking() and bench_forking()

Updated check_forking() and bench_forking() to use __mt_dup() to
duplicate maple tree. Also increased the number of VMAs, because the
new way is faster.

Signed-off-by: Peng Zhang <zhangpeng.00@...edance.com>
---
 lib/test_maple_tree.c | 61 +++++++++++++++++++++----------------------
 1 file changed, 30 insertions(+), 31 deletions(-)

diff --git a/lib/test_maple_tree.c b/lib/test_maple_tree.c
index 0ec0c6a7c0b5..72fba7cce148 100644
--- a/lib/test_maple_tree.c
+++ b/lib/test_maple_tree.c
@@ -1837,36 +1837,37 @@ static noinline void __init check_forking(struct maple_tree *mt)
 {
 
 	struct maple_tree newmt;
-	int i, nr_entries = 134;
+	int i, nr_entries = 300, ret;
 	void *val;
 	MA_STATE(mas, mt, 0, 0);
-	MA_STATE(newmas, mt, 0, 0);
+	MA_STATE(newmas, &newmt, 0, 0);
+
+	mt_init_flags(&newmt, MT_FLAGS_ALLOC_RANGE);
 
 	for (i = 0; i <= nr_entries; i++)
 		mtree_store_range(mt, i*10, i*10 + 5,
 				  xa_mk_value(i), GFP_KERNEL);
 
+
 	mt_set_non_kernel(99999);
-	mt_init_flags(&newmt, MT_FLAGS_ALLOC_RANGE);
-	newmas.tree = &newmt;
-	mas_reset(&newmas);
-	mas_reset(&mas);
 	mas_lock(&newmas);
-	mas.index = 0;
-	mas.last = 0;
-	if (mas_expected_entries(&newmas, nr_entries)) {
+	mas_lock(&mas);
+
+	ret = __mt_dup(mt, &newmt, GFP_NOWAIT | __GFP_NOWARN);
+	if (ret) {
 		pr_err("OOM!");
 		BUG_ON(1);
 	}
-	rcu_read_lock();
-	mas_for_each(&mas, val, ULONG_MAX) {
-		newmas.index = mas.index;
-		newmas.last = mas.last;
+
+	mas_set(&newmas, 0);
+	mas_for_each(&newmas, val, ULONG_MAX) {
 		mas_store(&newmas, val);
 	}
-	rcu_read_unlock();
-	mas_destroy(&newmas);
+
+	mas_unlock(&mas);
 	mas_unlock(&newmas);
+
+	mas_destroy(&newmas);
 	mt_validate(&newmt);
 	mt_set_non_kernel(0);
 	mtree_destroy(&newmt);
@@ -1974,12 +1975,11 @@ static noinline void __init check_mas_store_gfp(struct maple_tree *mt)
 #if defined(BENCH_FORK)
 static noinline void __init bench_forking(struct maple_tree *mt)
 {
-
 	struct maple_tree newmt;
-	int i, nr_entries = 134, nr_fork = 80000;
+	int i, nr_entries = 300, nr_fork = 80000, ret;
 	void *val;
 	MA_STATE(mas, mt, 0, 0);
-	MA_STATE(newmas, mt, 0, 0);
+	MA_STATE(newmas, &newmt, 0, 0);
 
 	for (i = 0; i <= nr_entries; i++)
 		mtree_store_range(mt, i*10, i*10 + 5,
@@ -1988,25 +1988,24 @@ static noinline void __init bench_forking(struct maple_tree *mt)
 	for (i = 0; i < nr_fork; i++) {
 		mt_set_non_kernel(99999);
 		mt_init_flags(&newmt, MT_FLAGS_ALLOC_RANGE);
-		newmas.tree = &newmt;
-		mas_reset(&newmas);
-		mas_reset(&mas);
-		mas.index = 0;
-		mas.last = 0;
-		rcu_read_lock();
+
 		mas_lock(&newmas);
-		if (mas_expected_entries(&newmas, nr_entries)) {
-			printk("OOM!");
+		mas_lock(&mas);
+		ret = __mt_dup(mt, &newmt, GFP_NOWAIT | __GFP_NOWARN);
+		if (ret) {
+			pr_err("OOM!");
 			BUG_ON(1);
 		}
-		mas_for_each(&mas, val, ULONG_MAX) {
-			newmas.index = mas.index;
-			newmas.last = mas.last;
+
+		mas_set(&newmas, 0);
+		mas_for_each(&newmas, val, ULONG_MAX) {
 			mas_store(&newmas, val);
 		}
-		mas_destroy(&newmas);
+
+		mas_unlock(&mas);
 		mas_unlock(&newmas);
-		rcu_read_unlock();
+
+		mas_destroy(&newmas);
 		mt_validate(&newmt);
 		mt_set_non_kernel(0);
 		mtree_destroy(&newmt);
-- 
2.20.1