PROBE::IOBLOCK_TRACE(3stap)                      IO Scheduler and block IO Taps                      PROBE::IOBLOCK_TRACE(3stap)



NAME
       probe::ioblock_trace.end - Fires whenever a block I/O transfer is complete.

SYNOPSIS
       ioblock_trace.end

VALUES
       None

DESCRIPTION
       name - name of the probe point q - request queue on which this bio was queued.  devname - block device name ino - i-node
       number of the mapped file bytes_done - number of bytes transferred 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

       rw - binary trace for read/write request vcnt - bio vector count which represents number of array element (page, offset,
       length) which makes up this I/O request idx - offset into the bio vector array phys_segments - number of segments in this
       bio after physical address coalescing is performed.  size - total size in bytes bdev - target block device 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

CONTEXT
       The process signals the transfer is done.



SystemTap Tapset Reference                                 August 2011                               PROBE::IOBLOCK_TRACE(3stap)