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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
devname block device name bdev_contains points to the device object which contains the partition (when bio structure represents a partition) name name of the probe point size total size in bytes opf operations and flags vcnt bio vector count which represents number of array element (page, offset, length) which make up this I/O 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 sector beginning sector for the entire bio phys_segments number of segments in this bio after physical address coalescing is performed idx offset into the bio vector array bdev target block device p_start_sect points to the start sector of the partition structure of the device ino i-node number of the mapped file rw binary trace for read/write request hw_segments number of segments after physical and DMA remapping hardware coalescing is performed
The process makes block I/O request
tapset::ioblock(3stap)
This page is part of the systemtap (a tracing and live-system
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SystemTap Tapset Reference November 2023 PROBE...K.REQ(3stap)
Pages that refer to this page: tapset::ioblock(3stap)