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PROBE...TRACE(3stap) IO Scheduler and block IO Taps PROBE...TRACE(3stap)
probe::ioblock_trace.bounce - Fires whenever a buffer bounce is
needed for at least one page of a block IO request.
ioblock_trace.bounce
name
name of the probe point
rw
binary trace for read/write request
idx
offset into the bio vector array phys_segments - number of
segments in this bio after physical address coalescing is
performed.
opf
operations and flags
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)
sector
beginning sector for the entire bio
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
bdev
target block device
ino
i-node number of the mapped file
p_start_sect
points to the start sector of the partition structure of the
device
q
request queue on which this bio was queued.
bytes_done
number of bytes transferred
devname
device for which a buffer bounce was needed.
size
total size in bytes
The process creating a block IO 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 2025-08-11. (At that
time, the date of the most recent commit that was found in the
repository was 2025-07-24.) 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 April 2025 PROBE...TRACE(3stap)
Pages that refer to this page: tapset::ioblock(3stap)
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HTML rendering created 2025-09-06 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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