The following is a short sample of output from the fspaging.d script.

fspaging.d traces syscall read and writes, vnode interface reads, writes,

getpage and putpage, and disk io.

# ./fspaging.d

Event Device RW Size Offset Path

disk_io dad1 R 1024 0 /extra1

disk_io dad1 R 8192 0 <none>

disk_io dad1 R 2048 0 <none>

sc-write . W 51200 0 /extra1/outfile

fop_write . W 51200 0 /extra1/outfile

fop_getpage . R 8192 0 /extra1/50k

disk_io dad1 R 8192 0 /extra1/50k

disk_ra dad1 R 8192 8 /extra1/50k

fop_getpage . R 8192 8 /extra1/50k

disk_ra dad1 R 34816 16 /extra1/50k

fop_getpage . R 8192 16 /extra1/50k

fop_getpage . R 8192 24 /extra1/50k

fop_getpage . R 8192 32 /extra1/50k

fop_getpage . R 8192 40 /extra1/50k

fop_getpage . R 8192 48 /extra1/50k

fop_putpage . W 8192 0 /extra1/outfile

fop_putpage . W 8192 8 /extra1/outfile

fop_putpage . W 8192 16 /extra1/outfile

fop_putpage . W 8192 24 /extra1/outfile

fop_putpage . W 8192 32 /extra1/outfile

fop_putpage . W 8192 40 /extra1/outfile

disk_io dad1 W 51200 0 /extra1/outfile

For a full discussion of this example, see fsrw_example.txt.