1PROBE::IOBLOCK_TRACE(3staIpO)Scheduler and block IO TaPpRsOBE::IOBLOCK_TRACE(3stap)
2
3
4
6 probe::ioblock_trace.end - Fires whenever a block I/O transfer is
7 complete.
8
10 ioblock_trace.end
11
13 flags
14 see below BIO_UPTODATE 0 ok after I/O completion BIO_RW_BLOCK 1
15 RW_AHEAD set, and read/write would block BIO_EOF 2 out-out-bounds
16 error BIO_SEG_VALID 3 nr_hw_seg valid BIO_CLONED 4 doesn't own data
17 BIO_BOUNCED 5 bio is a bounce bio BIO_USER_MAPPED 6 contains user
18 pages BIO_EOPNOTSUPP 7 not supported
19
20 q
21 request queue on which this bio was queued.
22
23 sector
24 beginning sector for the entire bio
25
26 name
27 name of the probe point
28
29 rw
30 binary trace for read/write request
31
32 ino
33 i-node number of the mapped file
34
35 vcnt
36 bio vector count which represents number of array element (page,
37 offset, length) which makes up this I/O request
38
39 opf
40 operations and flags
41
42 p_start_sect
43 points to the start sector of the partition structure of the device
44
45 size
46 total size in bytes
47
48 bdev
49 target block device
50
51 idx
52 offset into the bio vector array phys_segments - number of segments
53 in this bio after physical address coalescing is performed.
54
55 bdev_contains
56 points to the device object which contains the partition (when bio
57 structure represents a partition)
58
59 devname
60 block device name
61
62 bytes_done
63 number of bytes transferred
64
66 The process signals the transfer is done.
67
69 tapset::ioblock(3stap)
70
71
72
73SystemTap Tapset Reference May 2019 PROBE::IOBLOCK_TRACE(3stap)