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PROBE...K.REQ(3stap) IO Scheduler and block IO Taps PROBE...K.REQ(3stap)
probe::ioblock.request - Fires whenever making a generic block I/O request.
ioblock.request
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
The process makes block I/O request
tapset::ioblock(3stap)
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SystemTap Tapset Reference April 2024 PROBE...K.REQ(3stap)
Pages that refer to this page: tapset::ioblock(3stap)