[dpdk-dev] [PATCH v1 02/12] test/ring_perf: use compiler atomic builtins for lcores sync

[Honnappa Nagarahalli]

<snip>

> 
> Convert rte_atomic usages to compiler atomic built-ins for lcores sync in
> ring_perf test cases.
> 
> Signed-off-by: Joyce Kong <joyce.kong at arm.com>
> Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
Looks good.
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>

> ---
>  app/test/test_ring_perf.c | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/app/test/test_ring_perf.c b/app/test/test_ring_perf.c index
> fd82e20412..2d8bb675a3 100644
> --- a/app/test/test_ring_perf.c
> +++ b/app/test/test_ring_perf.c
> @@ -320,7 +320,7 @@ run_on_core_pair(struct lcore_pair *cores, struct
> rte_ring *r, const int esize)
>  	return 0;
>  }
> 
> -static rte_atomic32_t synchro;
> +static uint32_t synchro;
>  static uint64_t queue_count[RTE_MAX_LCORE];
> 
>  #define TIME_MS 100
> @@ -342,8 +342,7 @@ load_loop_fn_helper(struct thread_params *p, const
> int esize)
> 
>  	/* wait synchro for workers */
>  	if (lcore != rte_get_main_lcore())
> -		while (rte_atomic32_read(&synchro) == 0)
> -			rte_pause();
> +		rte_wait_until_equal_32(&synchro, 1, __ATOMIC_RELAXED);
> 
>  	begin = rte_get_timer_cycles();
>  	while (time_diff < hz * TIME_MS / 1000) { @@ -398,12 +397,12 @@
> run_on_all_cores(struct rte_ring *r, const int esize)
>  		param.r = r;
> 
>  		/* clear synchro and start workers */
> -		rte_atomic32_set(&synchro, 0);
> +		__atomic_store_n(&synchro, 0, __ATOMIC_RELAXED);
>  		if (rte_eal_mp_remote_launch(lcore_f, &param, SKIP_MAIN)
> < 0)
>  			return -1;
> 
>  		/* start synchro and launch test on main */
> -		rte_atomic32_set(&synchro, 1);
> +		__atomic_store_n(&synchro, 1, __ATOMIC_RELAXED);
>  		lcore_f(&param);
> 
>  		rte_eal_mp_wait_lcore();
> --
> 2.17.1