[dpdk-dev] [PATCH 1/4] test/stack: avoid trivial memory allocations

[Steven Lariau]

Replace the arguments array by one argument.
All objects in the args array have the same values, so there is no need
to use an array, only one struct is enough.
The args object is a lot smaller, and the allocation can be replaced
with a stack variable.

The allocation of obj_table isn't needed either, because MAX_BULK is
small. The allocation can instead be replaced with a static array.

Signed-off-by: Steven Lariau <steven.lariau at arm.com>
Reviewed-by: Dharmik Thakkar <dharmik.thakkar at arm.com>
Reviewed-by: Phil Yang <phil.yang at arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
---
 app/test/test_stack.c | 39 ++++++---------------------------------
 1 file changed, 6 insertions(+), 33 deletions(-)

diff --git a/app/test/test_stack.c b/app/test/test_stack.c
index c8dac1f55..5a7273a7d 100644
--- a/app/test/test_stack.c
+++ b/app/test/test_stack.c
@@ -280,16 +280,9 @@ static int
 stack_thread_push_pop(void *args)
 {
 	struct test_args *t = args;
-	void **obj_table;
+	void *obj_table[MAX_BULK];
 	int i;
 
-	obj_table = rte_calloc(NULL, STACK_SIZE, sizeof(void *), 0);
-	if (obj_table == NULL) {
-		printf("[%s():%u] failed to calloc %zu bytes\n",
-		       __func__, __LINE__, STACK_SIZE * sizeof(void *));
-		return -1;
-	}
-
 	for (i = 0; i < NUM_ITERS_PER_THREAD; i++) {
 		unsigned int success, num;
 
@@ -310,28 +303,25 @@ stack_thread_push_pop(void *args)
 		if (rte_stack_push(t->s, obj_table, num) != num) {
 			printf("[%s():%u] Failed to push %u pointers\n",
 			       __func__, __LINE__, num);
-			rte_free(obj_table);
 			return -1;
 		}
 
 		if (rte_stack_pop(t->s, obj_table, num) != num) {
 			printf("[%s():%u] Failed to pop %u pointers\n",
 			       __func__, __LINE__, num);
-			rte_free(obj_table);
 			return -1;
 		}
 
 		rte_atomic64_sub(t->sz, num);
 	}
 
-	rte_free(obj_table);
 	return 0;
 }
 
 static int
 test_stack_multithreaded(uint32_t flags)
 {
-	struct test_args *args;
+	struct test_args args;
 	unsigned int lcore_id;
 	struct rte_stack *s;
 	rte_atomic64_t size;
@@ -344,45 +334,28 @@ test_stack_multithreaded(uint32_t flags)
 	printf("[%s():%u] Running with %u lcores\n",
 	       __func__, __LINE__, rte_lcore_count());
 
-	args = rte_malloc(NULL, sizeof(struct test_args) * RTE_MAX_LCORE, 0);
-	if (args == NULL) {
-		printf("[%s():%u] failed to malloc %zu bytes\n",
-		       __func__, __LINE__,
-		       sizeof(struct test_args) * RTE_MAX_LCORE);
-		return -1;
-	}
-
 	s = rte_stack_create("test", STACK_SIZE, rte_socket_id(), flags);
 	if (s == NULL) {
 		printf("[%s():%u] Failed to create a stack\n",
 		       __func__, __LINE__);
-		rte_free(args);
 		return -1;
 	}
 
 	rte_atomic64_init(&size);
+	args.s = s;
+	args.sz = &size;
 
 	RTE_LCORE_FOREACH_SLAVE(lcore_id) {
-		args[lcore_id].s = s;
-		args[lcore_id].sz = &size;
-
 		if (rte_eal_remote_launch(stack_thread_push_pop,
-					  &args[lcore_id], lcore_id))
+					  &args, lcore_id))
 			rte_panic("Failed to launch lcore %d\n", lcore_id);
 	}
 
-	lcore_id = rte_lcore_id();
-
-	args[lcore_id].s = s;
-	args[lcore_id].sz = &size;
-
-	stack_thread_push_pop(&args[lcore_id]);
+	stack_thread_push_pop(&args);
 
 	rte_eal_mp_wait_lcore();
 
 	rte_stack_free(s);
-	rte_free(args);
-
 	return 0;
 }
 
-- 
2.17.1