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

PROBE...TRACE(3stap) IO Scheduler and block IO Taps PROBE...TRACE(3stap)

NAME         top

       probe::ioblock_trace.request - Fires just as a generic block I/O
       request is created for a bio.

SYNOPSIS         top

       ioblock_trace.request

VALUES         top

       ino
           i-node number of the mapped file

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

       devname
           block device name

       q
           request queue on which this bio was queued.

       bdev
           target block device

       rw
           binary trace for read/write request

       opf
           operations and flags

       bytes_done
           number of bytes transferred

       sector
           beginning sector for the entire bio

       idx
           offset into the bio vector array phys_segments - number of
           segments in this bio after physical address coalescing is
           performed.

       bdev_contains
           points to the device object which contains the partition
           (when bio structure represents a partition)

       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

       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

       name
           name of the probe point

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 systemtap@sourceware.org.
       This page was obtained from the project's upstream Git repository
       ⟨git://sourceware.org/git/systemtap.git⟩ on 2024-06-14.  (At that
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       (which is not part of the original manual page), send a mail to
       man-pages@man7.org

SystemTap Tapset Reference     April 2024           PROBE...TRACE(3stap)

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

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