testsuite/systemtap.samples/ioblocktest.stp


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#! stap
global teststr
probe begin { log("systemtap starting probe") }

probe ioblock.request {
   teststr = sprintf("ioblock: %s\t%d\t%s\t%d\n", devname, sector, bio_rw_str(rw), rw)
}
probe ioblock.end {
   teststr = sprintf("ioblock: %s\t%d\t%s\t%d\n", devname, sector, bio_rw_str(rw), rw) 
}
probe end { 
   log("systemtap ending probe")
   printf("%s", teststr)
}