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PROBE::IOBLOCK_TRACE(3stap) IO Scheduler and block IO Taps PROBE::IOBLOCK_TRACE(3stap)

NAME

probe::ioblock_trace.end - Fires whenever a block I/O transfer is complete.

SYNOPSIS

ioblock_trace.end 

VALUES

p_start_sect
points to the start sector of the partition structure of the device

rw

binary trace for read/write request

size

total size in bytes

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

idx

offset into the bio vector array phys_segments - number of segments in this bio after physical address coalescing is performed.

sector

beginning sector for the entire bio

opf

operations and flags

vcnt

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

bytes_done

number of bytes transferred

ino

i-node number of the mapped file

bdev

target block device

name

name of the probe point

devname

block device name

q

request queue on which this bio was queued.

bdev_contains

points to the device object which contains the partition (when bio structure represents a partition)

CONTEXT

The process signals the transfer is done.

SEE ALSO0

tapset::ioblock(3stap)
May 2021 SystemTap Tapset Reference