probe::ioscheduler.elv_add_request(3stap) [centos man page]
PROBE::IOSCHEDULER(3stap) IO Scheduler and block IO Taps PROBE::IOSCHEDULER(3stap)NAME
probe::ioscheduler.elv_add_request - probe to indicate request is added to the request queue.
Disk major no of request.
Address of request.
Pointer to request queue.
The type of I/O elevator currently enabled.
Disk minor number of request.
SystemTap Tapset Reference June 2014 PROBE::IOSCHEDULER(3stap)
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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.
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
The process signals the transfer is done.
SystemTap Tapset Reference June 2014 PROBE::IOBLOCK_TRACE(3stap)
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