[PATCH v2 09/12] app/compress: use compiler atomic builtins for display sync

[Honnappa Nagarahalli]

<snip>

> 
> Convert rte_atomic_test_and_set usage to compiler atomic CAS operation for
> display sync.
> 
> Signed-off-by: Joyce Kong <joyce.kong at arm.com>
> Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>

> ---
>  app/test-compress-perf/comp_perf_test_common.h    |  2 +-
>  .../comp_perf_test_cyclecount.c                   | 15 +++++++--------
>  .../comp_perf_test_throughput.c                   | 10 +++++++---
>  app/test-compress-perf/comp_perf_test_verify.c    |  6 ++++--
>  4 files changed, 19 insertions(+), 14 deletions(-)
> 
> diff --git a/app/test-compress-perf/comp_perf_test_common.h b/app/test-
> compress-perf/comp_perf_test_common.h
> index 72705c6a2b..d039e5a29a 100644
> --- a/app/test-compress-perf/comp_perf_test_common.h
> +++ b/app/test-compress-perf/comp_perf_test_common.h
> @@ -14,7 +14,7 @@ struct cperf_mem_resources {
>  	uint16_t qp_id;
>  	uint8_t lcore_id;
> 
> -	rte_atomic16_t print_info_once;
> +	uint16_t print_info_once;
> 
>  	uint32_t total_bufs;
>  	uint8_t *compressed_data;
> diff --git a/app/test-compress-perf/comp_perf_test_cyclecount.c b/app/test-
> compress-perf/comp_perf_test_cyclecount.c
> index c875ddbdac..da55b02b74 100644
> --- a/app/test-compress-perf/comp_perf_test_cyclecount.c
> +++ b/app/test-compress-perf/comp_perf_test_cyclecount.c
> @@ -466,7 +466,7 @@ cperf_cyclecount_test_runner(void *test_ctx)
>  	struct cperf_cyclecount_ctx *ctx = test_ctx;
>  	struct comp_test_data *test_data = ctx->ver.options;
>  	uint32_t lcore = rte_lcore_id();
> -	static rte_atomic16_t display_once = RTE_ATOMIC16_INIT(0);
> +	static uint16_t display_once;
>  	static rte_spinlock_t print_spinlock;
>  	int i;
> 
> @@ -486,10 +486,12 @@ cperf_cyclecount_test_runner(void *test_ctx)
> 
>  	ctx->ver.mem.lcore_id = lcore;
> 
> +	uint16_t exp = 0;
>  	/*
>  	 * printing information about current compression thread
>  	 */
> -	if (rte_atomic16_test_and_set(&ctx->ver.mem.print_info_once))
> +	if (__atomic_compare_exchange_n(&ctx->ver.mem.print_info_once,
> &exp,
> +				1, 0, __ATOMIC_RELAXED,
> __ATOMIC_RELAXED))
>  		printf("    lcore: %u,"
>  				" driver name: %s,"
>  				" device name: %s,"
> @@ -546,9 +548,10 @@ cperf_cyclecount_test_runner(void *test_ctx)
>  			(ctx->ver.mem.total_bufs * test_data->num_iter);
> 
>  	/* R E P O R T processing */
> -	if (rte_atomic16_test_and_set(&display_once)) {
> +	rte_spinlock_lock(&print_spinlock);
> 
> -		rte_spinlock_lock(&print_spinlock);
> +	if (display_once == 0) {
> +		display_once = 1;
> 
>  		printf("\nLegend for the table\n"
>  		"  - Retries section: number of retries for the following
> operations:\n"
> @@ -576,12 +579,8 @@ cperf_cyclecount_test_runner(void *test_ctx)
>  			"setup/op",
>  			"[C-e]", "[C-d]",
>  			"[D-e]", "[D-d]");
> -
> -		rte_spinlock_unlock(&print_spinlock);
>  	}
> 
> -	rte_spinlock_lock(&print_spinlock);
> -
>  	printf("%12u"
>  	       "%6u"
>  	       "%12zu"
> diff --git a/app/test-compress-perf/comp_perf_test_throughput.c b/app/test-
> compress-perf/comp_perf_test_throughput.c
> index 13922b658c..d3dff070b0 100644
> --- a/app/test-compress-perf/comp_perf_test_throughput.c
> +++ b/app/test-compress-perf/comp_perf_test_throughput.c
> @@ -329,15 +329,17 @@ cperf_throughput_test_runner(void *test_ctx)
>  	struct cperf_benchmark_ctx *ctx = test_ctx;
>  	struct comp_test_data *test_data = ctx->ver.options;
>  	uint32_t lcore = rte_lcore_id();
> -	static rte_atomic16_t display_once = RTE_ATOMIC16_INIT(0);
> +	static uint16_t display_once;
>  	int i, ret = EXIT_SUCCESS;
> 
>  	ctx->ver.mem.lcore_id = lcore;
> 
> +	uint16_t exp = 0;
>  	/*
>  	 * printing information about current compression thread
>  	 */
> -	if (rte_atomic16_test_and_set(&ctx->ver.mem.print_info_once))
> +	if (__atomic_compare_exchange_n(&ctx->ver.mem.print_info_once,
> &exp,
> +				1, 0, __ATOMIC_RELAXED,
> __ATOMIC_RELAXED))
>  		printf("    lcore: %u,"
>  				" driver name: %s,"
>  				" device name: %s,"
> @@ -391,7 +393,9 @@ cperf_throughput_test_runner(void *test_ctx)
>  	ctx->decomp_gbps = rte_get_tsc_hz() / ctx->decomp_tsc_byte * 8 /
>  			1000000000;
> 
> -	if (rte_atomic16_test_and_set(&display_once)) {
> +	exp = 0;
> +	if (__atomic_compare_exchange_n(&display_once, &exp, 1, 0,
> +			__ATOMIC_RELAXED, __ATOMIC_RELAXED)) {
>  		printf("\n%12s%6s%12s%17s%15s%16s\n",
>  			"lcore id", "Level", "Comp size", "Comp ratio [%]",
>  			"Comp [Gbps]", "Decomp [Gbps]");
> diff --git a/app/test-compress-perf/comp_perf_test_verify.c b/app/test-
> compress-perf/comp_perf_test_verify.c
> index 5e13257b79..f6e21368e8 100644
> --- a/app/test-compress-perf/comp_perf_test_verify.c
> +++ b/app/test-compress-perf/comp_perf_test_verify.c
> @@ -388,7 +388,7 @@ cperf_verify_test_runner(void *test_ctx)
>  	struct cperf_verify_ctx *ctx = test_ctx;
>  	struct comp_test_data *test_data = ctx->options;
>  	int ret = EXIT_SUCCESS;
> -	static rte_atomic16_t display_once = RTE_ATOMIC16_INIT(0);
> +	static uint16_t display_once;
>  	uint32_t lcore = rte_lcore_id();
> 
>  	ctx->mem.lcore_id = lcore;
> @@ -427,8 +427,10 @@ cperf_verify_test_runner(void *test_ctx)
>  	ctx->ratio = (double) ctx->comp_data_sz /
>  			test_data->input_data_sz * 100;
> 
> +	uint16_t exp = 0;
>  	if (!ctx->silent) {
> -		if (rte_atomic16_test_and_set(&display_once)) {
> +		if (__atomic_compare_exchange_n(&display_once, &exp, 1, 0,
> +				__ATOMIC_RELAXED, __ATOMIC_RELAXED)) {
>  			printf("%12s%6s%12s%17s\n",
>  			    "lcore id", "Level", "Comp size", "Comp ratio [%]");
>  		}
> --
> 2.25.1