GFS2_LKS_SRTT
(unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTT],
[GFS2_LKS_SRTT] = "srtt",
unsigned index = blocking ? GFS2_LKS_SRTTB : GFS2_LKS_SRTT;
__entry->srtt = gl->gl_stats.stats[GFS2_LKS_SRTT];