probe::ioblock.end.3stap man page

probe::ioblock.end — Fires whenever a block I/O transfer is complete.

Synopsis

ioblock.end

Values

devname

block device name

phys_segments

number of segments in this bio after physical address coalescing is performed.

error

0 on success

sector

beginning sector for the entire bio

vcnt

bio vector count which represents number of array element (page, offset, length) which makes up this I/O request

name

name of the probe point

flags

see below BIO_UPTODATE 0 ok after I/O completion BIO_RW_BLOCK 1 RW_AHEAD set, and read/write would block BIO_EOF 2 out-out-bounds error BIO_SEG_VALID 3 nr_hw_seg valid BIO_CLONED 4 doesn't own data BIO_BOUNCED 5 bio is a bounce bio BIO_USER_MAPPED 6 contains user pages BIO_EOPNOTSUPP 7 not supported

size

total size in bytes

rw

binary trace for read/write request

idx

offset into the bio vector array

ino

i-node number of the mapped file

bytes_done

number of bytes transferred

hw_segments

number of segments after physical and DMA remapping hardware coalescing is performed

Context

The process signals the transfer is done.

See Also0

tapset::ioblock(3stap)

Info

March 2016 SystemTap Tapset Reference IO Scheduler and block IO Taps