| 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¶
bdev
target block device
sector
beginning sector for the entire bio
size
total size in bytes
ino
i-node number of the mapped file
idx
offset into the bio vector array phys_segments -
number of segments in this bio after physical address coalescing is
performed.
devname
block device name
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
q
request queue on which this bio was queued.
p_start_sect
points to the start sector of the partition structure of
the device
rw
binary trace for read/write request
vcnt
bio vector count which represents number of array element
(page, offset, length) which makes up this I/O request
bdev_contains
points to the device object which contains the partition
(when bio structure represents a partition)
name
name of the probe point
opf
operations and flags
bytes_done
number of bytes transferred
CONTEXT¶
The process signals the transfer is done.
SEE ALSO0¶
tapset::ioblock(3stap)
| May 2022 | SystemTap Tapset Reference |