./"flags"8t"nrm"8t"cv"8t"mapping         selock"nBBx2X
+/"vnode"16t"offset"16t"hash"n3X
+/"vpnext"16t"vpprev"n2X
+/"iolock.slpq"16t"iolock.count"nXD
+/"next"16t"prev"n2X
+/"lckcnt"8t"cowcnt"8t"pagenum"n2xX4+
