probe::ioblock_trace.bounce.3stap man page
probe::ioblock_trace.bounce — Fires whenever a buffer bounce is needed for at least one page of a block IO request.
points to the start sector of the partition structure of the device
request queue on which this bio was queued.
bio vector count which represents number of array element (page, offset, length) which makes up this I/O request
total size in bytes
device for which a buffer bounce was needed.
points to the device object which contains the partition (when bio structure represents a partition)
target block device
number of bytes transferred
i-node number of the mapped file
binary trace for read/write request
beginning sector for the entire bio
operations and 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 of the probe point
offset into the bio vector array phys_segments - number of segments in this bio after physical address coalescing is performed.
The process creating a block IO request.