probe::ioblock.request(3stap) — Linux manual page

NAME | SYNOPSIS | VALUES | CONTEXT | SEE ALSO | COLOPHON

PROBE...K.REQ(3stap) IO Scheduler and block IO Taps PROBE...K.REQ(3stap)

NAME         top

       probe::ioblock.request - Fires whenever making a generic block
       I/O request.

SYNOPSIS         top

       ioblock.request

VALUES         top

       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

       vcnt
           bio vector count which represents number of array element
           (page, offset, length) which make up this I/O request

       size
           total size in bytes

       sector
           beginning sector for the entire bio

       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

       opf
           operations and flags

       hw_segments
           number of segments after physical and DMA remapping hardware
           coalescing is performed

       rw
           binary trace for read/write request

       ino
           i-node number of the mapped file

       p_start_sect
           points to the start sector of the partition structure of the
           device

       bdev
           target block device

       devname
           block device name

CONTEXT         top

       The process makes block I/O request

SEE ALSO         top

       tapset::ioblock(3stap)

COLOPHON         top

       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...K.REQ(3stap)

Pages that refer to this page: tapset::ioblock(3stap)