nobarrier
BUILD_RAC_CACHE_OP(kern_cache_all, nobarrier);
TP_PROTO(struct block_device *dev, unsigned int nobarrier,
TP_ARGS(dev, nobarrier, flush_merge, ret),
__field(unsigned int, nobarrier)
__entry->nobarrier = nobarrier;
__entry->nobarrier ? "skip (nobarrier)" : "issue",