| 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 |