The following table describes the probes for the
io provider.
Table 11.9 io Probes
Probe | Description |
|---|---|
| Fires when an I/O request is about to be made either to a peripheral device or to an NFS server. |
|
Fires after an I/O request has been fulfilled. The
done probe fires after the I/O completes, but before
completion processing has been performed on the
buffer. As a result |
|
Fires immediately before a thread begins to wait
pending completion of a given I/O request. Some time
after the |
|
Fires when a thread finishes waiting for the
completion of a given I/O request. The
|
The io probes fire for all I/O requests to
peripheral devices, and for all file read and file write
requests to an NFS server. Requests for metadata from an NFS
server, for example, do not trigger io probes
due to a readdir() request.