[dpdk-dev] [PATCH v4] lib/timer: relax barrier for status update

[Thomas Monjalon]

26/04/2020 16:45, Phil Yang:
> Volatile has no ordering semantics. The rte_timer structure defines
> timer status as a volatile variable and uses the rte_r/wmb barrier
> to guarantee inter-thread visibility.
> 
> This patch optimized the volatile operation with c11 atomic operations
> and one-way barrier to save the performance penalty. According to the
> timer_perf_autotest benchmarking results, this patch can uplift 10%~16%
> timer appending performance, 3%~20% timer resetting performance and 45%
> timer callbacks scheduling performance on aarch64 and no loss in
> performance for x86.
> 
> Suggested-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
> Signed-off-by: Phil Yang <phil.yang at arm.com>
> Reviewed-by: Gavin Hu <gavin.hu at arm.com>
> Acked-by: Erik Gabriel Carrillo <erik.g.carrillo at intel.com>

Applied, thanks