title: Watch a variable changing value in a thread. name: varwatch.stp keywords: monitoring description: This script places a set of probes (specified by $1), each of which monitors the state of some context $variable expression (specified by $2). Whenever the value changes, with respect to the active thread, the event is traced. test_check: stap -wp4 varwatch.stp 'kernel.statement("do_sys_open@fs/open.c:*")' '$$vars' test_installcheck: stap -w varwatch.stp 'kernel.statement("do_sys_open@fs/open.c:*")' '$$vars' -c "sleep 0.2"