[dpdk-stable] [PATCH v1 1/2] test/rwlock: add perf test case

[Joyce Kong <joyce.kong@arm.com>]

Add performance test on all available cores to benchmark
the scaling up performance and fairness of rw_lock.

Fixes: af75078faf ("first public release")
Cc: stable@dpdk.org

Suggested-by: Gavin Hu <gavin.hu@arm.com>
Signed-off-by: Joyce Kong <joyce.kong@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Reviewed-by: Ola Liljedahl <ola.liljedahl@arm.com>
Reviewed-by: Gavin Hu <gavin.hu@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
---
 test/test/test_rwlock.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)

diff --git a/test/test/test_rwlock.c b/test/test/test_rwlock.c
index 29171c4..4766c09 100644
--- a/test/test/test_rwlock.c
+++ b/test/test/test_rwlock.c
@@ -4,6 +4,7 @@
 
 #include <stdio.h>
 #include <stdint.h>
+#include <inttypes.h>
 #include <unistd.h>
 #include <sys/queue.h>
 
@@ -44,6 +45,7 @@
 
 static rte_rwlock_t sl;
 static rte_rwlock_t sl_tab[RTE_MAX_LCORE];
+static rte_atomic32_t synchro;
 
 static int
 test_rwlock_per_core(__attribute__((unused)) void *arg)
@@ -65,6 +67,72 @@ test_rwlock_per_core(__attribute__((unused)) void *arg)
 	return 0;
 }
 
+static rte_rwlock_t lk = RTE_RWLOCK_INITIALIZER;
+static uint64_t lock_count[RTE_MAX_LCORE] = {0};
+
+#define TIME_MS 100
+
+static int
+load_loop_fn(__attribute__((unused)) void *arg)
+{
+	uint64_t time_diff = 0, begin;
+	uint64_t hz = rte_get_timer_hz();
+	uint64_t lcount = 0;
+	const unsigned int lcore = rte_lcore_id();
+
+	/* wait synchro for slaves */
+	if (lcore != rte_get_master_lcore())
+		while (rte_atomic32_read(&synchro) == 0)
+			;
+
+	begin = rte_rdtsc_precise();
+	while (time_diff < hz * TIME_MS / 1000) {
+		rte_rwlock_write_lock(&lk);
+		rte_pause();
+		rte_rwlock_write_unlock(&lk);
+		rte_rwlock_read_lock(&lk);
+		rte_rwlock_read_lock(&lk);
+		rte_pause();
+		rte_rwlock_read_unlock(&lk);
+		rte_rwlock_read_unlock(&lk);
+		lcount++;
+		/* delay to make lock duty cycle slightly realistic */
+		rte_pause();
+		time_diff = rte_rdtsc_precise() - begin;
+	}
+	lock_count[lcore] = lcount;
+	return 0;
+}
+
+static int
+test_rwlock_perf(void)
+{
+	unsigned int i;
+	uint64_t total = 0;
+
+	printf("\nRwlock Perf Test on %u cores...\n", rte_lcore_count());
+
+	/* clear synchro and start slaves */
+	rte_atomic32_set(&synchro, 0);
+	if (rte_eal_mp_remote_launch(load_loop_fn, NULL, SKIP_MASTER) < 0)
+		return -1;
+
+	/* start synchro and launch test on master */
+	rte_atomic32_set(&synchro, 1);
+	load_loop_fn(NULL);
+
+	rte_eal_mp_wait_lcore();
+
+	RTE_LCORE_FOREACH(i) {
+		printf("Core [%u] count = %"PRIu64"\n", i, lock_count[i]);
+		total += lock_count[i];
+	}
+
+	printf("Total count = %"PRIu64"\n", total);
+
+	return 0;
+}
+
 static int
 test_rwlock(void)
 {
@@ -95,6 +163,9 @@ test_rwlock(void)
 
 	rte_eal_mp_wait_lcore();
 
+	if (test_rwlock_perf() < 0)
+		return -1;
+
 	return 0;
 }
 
-- 
2.7.4