| PROBE::IOBLOCK.END(3stap) | IO Scheduler and block IO Taps | PROBE::IOBLOCK.END(3stap) |
NAME¶
probe::ioblock.end - Fires whenever a block I/O transfer is complete.
SYNOPSIS¶
ioblock.end
VALUES¶
devname
block device name
name
name of the probe point
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
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
phys_segments
number of segments in this bio after physical address
coalescing is performed.
rw
binary trace for read/write request
idx
offset into the bio vector array
sector
beginning sector for the entire bio
error
0 on success
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)
| May 2021 | SystemTap Tapset Reference |