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PROBE...K.REQ(3stap) IO Scheduler and block IO Taps PROBE...K.REQ(3stap)
probe::ioblock.request - Fires whenever making a generic block I/O
request.
ioblock.request
bdev_contains
points to the device object which contains the partition (when
bio structure represents a partition)
p_start_sect
points to the start sector of the partition structure of the
device
idx
offset into the bio vector array
rw
binary trace for read/write request
sector
beginning sector for the entire bio
ino
i-node number of the mapped file
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
opf
operations and flags
bdev
target block device
size
total size in bytes
name
name of the probe point
devname
block device name
hw_segments
number of segments after physical and DMA remapping hardware
coalescing is performed
vcnt
bio vector count which represents number of array element
(page, offset, length) which make up this I/O request
phys_segments
number of segments in this bio after physical address
coalescing is performed
The process makes block I/O request
tapset::ioblock(3stap)
This page is part of the systemtap (a tracing and live-system
analysis tool) project. Information about the project can be
found at ⟨https://sourceware.org/systemtap/⟩. If you have a bug
report for this manual page, send it to systemtap@sourceware.org.
This page was obtained from the project's upstream Git repository
⟨git://sourceware.org/git/systemtap.git⟩ on 2025-02-02. (At that
time, the date of the most recent commit that was found in the
repository was 2025-01-28.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
SystemTap Tapset Reference November 2024 PROBE...K.REQ(3stap)
Pages that refer to this page: tapset::ioblock(3stap)
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HTML rendering created 2025-02-02 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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