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4.2.4. I/O Monitoring (By Device)
This section describes how to monitor I/O activity on a specific device.
traceio2.stp
#! /usr/bin/env stap
global device_of_interest
probe begin {
/* The following is not the most efficient way to do this.
One could directly put the result of usrdev2kerndev()
into device_of_interest. However, want to test out
the other device functions */
dev = usrdev2kerndev($1)
device_of_interest = MKDEV(MAJOR(dev), MINOR(dev))
}
probe vfs.write, vfs.read
{
if (dev == device_of_interest)
printf ("%s(%d) %s 0x%x\n",
execname(), pid(), probefunc(), dev)
}
traceio2.stp takes 1 argument: the whole device number. To get this number, use
stat -c "0x%D" directory, where directory is located in the device you wish to monitor.
The
usrdev2kerndev() function converts the whole device number into the format understood by the kernel. The output produced by usrdev2kerndev() is used in conjunction with the MKDEV(), MINOR(), and MAJOR() functions to determine the major and minor numbers of a specific device.
The output of traceio2.stp includes the name and ID of any process performing a read/write, the function it is performing (that is
vfs_read or vfs_write), and the kernel device number.
The following example is an excerpt from the full output of
stap traceio2.stp 0x805, where 0x805 is the whole device number of /home. /home resides in /dev/sda5, which is the device we wish to monitor.
Example 4.8. traceio2.stp Sample Output
[...] synergyc(3722) vfs_read 0x800005 synergyc(3722) vfs_read 0x800005 cupsd(2889) vfs_write 0x800005 cupsd(2889) vfs_write 0x800005 cupsd(2889) vfs_write 0x800005 [...]
