[PATCH v3 27/33] radix tree test suite: Check multiorder iteration

Matthew Wilcox
2016-11-28T20:04:40Z

From: Matthew Wilcox <mawilcox@microsoft.com>

The random iteration test only inserts order-0 entries currently.
Update it to insert entries of order between 7 and 0. Also make the
maximum index configurable, make some variables static, make the test
duration variable, remove some useless spinning, and add a fifth thread
which calls tag_tagged_items().

Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
---
tools/testing/radix-tree/iteration_check.c | 80 ++++++++++++++++++------------
tools/testing/radix-tree/main.c | 3 +-
tools/testing/radix-tree/multiorder.c | 23 +++++++++
tools/testing/radix-tree/test.h | 2 +-
4 files changed, 73 insertions(+), 35 deletions(-)

diff --git a/tools/testing/radix-tree/iteration_check.c b/tools/testing/radix-tree/iteration_check.c
index f328a66..7572b7e 100644
--- a/tools/testing/radix-tree/iteration_check.c
+++ b/tools/testing/radix-tree/iteration_check.c
@@ -16,26 +16,36 @@
#include <pthread.h>
#include "test.h"

-#define NUM_THREADS 4
-#define TAG 0
+#define NUM_THREADS 5
+#define MAX_IDX 100
+#define TAG 0
+#define NEW_TAG 1
+
static pthread_mutex_t tree_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_t threads[NUM_THREADS];
static unsigned int seeds[3];
-RADIX_TREE(tree, GFP_KERNEL);
-bool test_complete;
+static RADIX_TREE(tree, GFP_KERNEL);
+static bool test_complete;
+static int max_order;

/* relentlessly fill the tree with tagged entries */
static void *add_entries_fn(void *arg)
{
- int pgoff;
-
rcu_register_thread();

while (!test_complete) {
- for (pgoff = 0; pgoff < 100; pgoff++) {
+ unsigned long pgoff;
+ int order;
+
+ for (pgoff = 0; pgoff < MAX_IDX; pgoff++) {
pthread_mutex_lock(&tree_lock);
- if (item_insert(&tree, pgoff) == 0)
- item_tag_set(&tree, pgoff, TAG);
+ for (order = max_order; order >= 0; order--) {
+ if (item_insert_order(&tree, pgoff, order)
+ == 0) {
+ item_tag_set(&tree, pgoff, TAG);
+ break;
+ }
+ }
pthread_mutex_unlock(&tree_lock);
}
}
@@ -62,14 +72,7 @@ static void *tagged_iteration_fn(void *arg)
while (!test_complete) {
rcu_read_lock();
radix_tree_for_each_tagged(slot, &tree, &iter, 0, TAG) {
- void *entry;
- int i;
-
- /* busy wait to let removals happen */
- for (i = 0; i < 1000000; i++)
- ;
-
- entry = radix_tree_deref_slot(slot);
+ void *entry = radix_tree_deref_slot(slot);
if (unlikely(!entry))
continue;

@@ -110,14 +113,7 @@ static void *untagged_iteration_fn(void *arg)
while (!test_complete) {
rcu_read_lock();
radix_tree_for_each_slot(slot, &tree, &iter, 0) {
- void *entry;
- int i;
-
- /* busy wait to let removals happen */
- for (i = 0; i < 1000000; i++)
- ;
-
- entry = radix_tree_deref_slot(slot);
+ void *entry = radix_tree_deref_slot(slot);
if (unlikely(!entry))
continue;

@@ -152,7 +148,7 @@ static void *remove_entries_fn(void *arg)
while (!test_complete) {
int pgoff;

- pgoff = rand_r(&seeds[2]) % 100;
+ pgoff = rand_r(&seeds[2]) % MAX_IDX;

pthread_mutex_lock(&tree_lock);
item_delete(&tree, pgoff);
@@ -164,36 +160,54 @@ static void *remove_entries_fn(void *arg)
return NULL;
}

+static void *tag_entries_fn(void *arg)
+{
+ rcu_register_thread();
+
+ while (!test_complete) {
+ tag_tagged_items(&tree, &tree_lock, 0, MAX_IDX, 10, TAG,
+ NEW_TAG);
+ }
+ rcu_unregister_thread();
+ return NULL;
+}
+
/* This is a unit test for a bug found by the syzkaller tester */
-void iteration_test(void)
+void iteration_test(unsigned order, unsigned test_duration)
{
int i;

- printf("Running iteration tests for 10 seconds\n");
+ printf("Running %siteration tests for %d seconds\n",
+ order > 0 ? "multiorder " : "", test_duration);

+ max_order = order;
test_complete = false;

for (i = 0; i < 3; i++)
seeds[i] = rand();

if (pthread_create(&threads[0], NULL, tagged_iteration_fn, NULL)) {
- perror("pthread_create");
+ perror("create tagged iteration thread");
exit(1);
}
if (pthread_create(&threads[1], NULL, untagged_iteration_fn, NULL)) {
- perror("pthread_create");
+ perror("create untagged iteration thread");
exit(1);
}
if (pthread_create(&threads[2], NULL, add_entries_fn, NULL)) {
- perror("pthread_create");
+ perror("create add entry thread");
exit(1);
}
if (pthread_create(&threads[3], NULL, remove_entries_fn, NULL)) {
- perror("pthread_create");
+ perror("create remove entry thread");
+ exit(1);
+ }
+ if (pthread_create(&threads[4], NULL, tag_entries_fn, NULL)) {
+ perror("create tag entry thread");
exit(1);
}

- sleep(10);
+ sleep(test_duration);
test_complete = true;

for (i = 0; i < NUM_THREADS; i++) {
diff --git a/tools/testing/radix-tree/main.c b/tools/testing/radix-tree/main.c
index 170175c..f7e9801 100644
--- a/tools/testing/radix-tree/main.c
+++ b/tools/testing/radix-tree/main.c
@@ -350,7 +350,8 @@ int main(int argc, char **argv)
regression1_test();
regression2_test();
regression3_test();
- iteration_test();
+ iteration_test(0, 10);
+ iteration_test(7, 20);
single_thread_tests(long_run);

/* Free any remaining preallocated nodes */
diff --git a/tools/testing/radix-tree/multiorder.c b/tools/testing/radix-tree/multiorder.c
index 9757b89..08b4e16 100644
--- a/tools/testing/radix-tree/multiorder.c
+++ b/tools/testing/radix-tree/multiorder.c
@@ -75,8 +75,27 @@ static void __multiorder_tag_test(int index, int order)
item_kill_tree(&tree);
}

+static void __multiorder_tag_test2(unsigned order, unsigned long index2)
+{
+ RADIX_TREE(tree, GFP_KERNEL);
+ unsigned long index = (1 << order);
+ index2 += index;
+
+ assert(item_insert_order(&tree, 0, order) == 0);
+ assert(item_insert(&tree, index2) == 0);
+
+ assert(radix_tree_tag_set(&tree, 0, 0));
+ assert(radix_tree_tag_set(&tree, index2, 0));
+
+ assert(tag_tagged_items(&tree, NULL, 0, ~0UL, 10, 0, 1) == 2);
+
+ item_kill_tree(&tree);
+}
+
static void multiorder_tag_tests(void)
{
+ int i, j;
+
/* test multi-order entry for indices 0-7 with no sibling pointers */
__multiorder_tag_test(0, 3);
__multiorder_tag_test(5, 3);
@@ -116,6 +135,10 @@ static void multiorder_tag_tests(void)
__multiorder_tag_test(300, 8);

__multiorder_tag_test(0x12345678UL, 8);
+
+ for (i = 1; i < 10; i++)
+ for (j = 0; j < (10 << i); j++)
+ __multiorder_tag_test2(i, j);
}

static void multiorder_check(unsigned long index, int order)
diff --git a/tools/testing/radix-tree/test.h b/tools/testing/radix-tree/test.h
index 7c2611c..056a23b 100644
--- a/tools/testing/radix-tree/test.h
+++ b/tools/testing/radix-tree/test.h
@@ -32,7 +32,7 @@ unsigned long find_item(struct radix_tree_root *, void *item);

void tag_check(void);
void multiorder_checks(void);
-void iteration_test(void);
+void iteration_test(unsigned order, unsigned duration);
void benchmark(void);

struct item *
--
2.10.2