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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
p_start_sect
points to the start sector of the partition structure of the
device
ino
i-node number of the mapped file
bdev
target block device
devname
device for which a buffer bounce was needed.
q
request queue on which this bio was queued.
opf
operations and flags
rw
binary trace for read/write request
sector
beginning sector for the entire bio
bytes_done
number of bytes transferred
bdev_contains
points to the device object which contains the partition
(when bio structure represents a partition)
idx
offset into the bio vector array phys_segments - number of
segments in this bio after physical address coalescing is
performed.
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
name
name of the probe point
size
total size in bytes
vcnt
bio vector count which represents number of array element
(page, offset, length) which makes up this I/O request
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 [email protected].
This page was obtained from the project's upstream Git repository
⟨git://sourceware.org/git/systemtap.git⟩ on 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2024-06-13.) 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
[email protected]
SystemTap Tapset Reference April 2024 PROBE...TRACE(3stap)
Pages that refer to this page: tapset::ioblock(3stap)
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HTML rendering created 2024-06-26 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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