diff options
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 27 |
1 files changed, 27 insertions, 0 deletions
@@ -1,5 +1,20 @@ * What's new + - New probes process().insn and process().insn.block that allows + inspection of the process after each instruction or block of + instructions executed. So to count the total number of instructions + a process executes during a run do something like: + $ stap -e 'global steps; probe process("/bin/ls").insn {steps++} + probe end {printf("Total instructions: %d\n", steps);}' \ + -c /bin/ls + This feature can slow down execution of a process somewhat. + + - Systemtap probes and function man pages extracted from the tapsets + are now available under 3stap. To show the page for probe vm.pagefault + or the stap function pexecname do: + $ man 3stap vm.pagefault + $ man 3stap pexecname + - Kernel tracepoints are now supported for probing predefined kernel events without any debuginfo. Tracepoints incur less overhead than kprobes, and context parameters are available with full type @@ -39,6 +54,18 @@ This replaces any dwarf $variable expressions that could not be resolved with literal numeric zeros, along with a warning message. +- Both kernel markers and kernel tracepoint support argument listing + through stap -L 'kernel.mark("*")' or stap -L 'kernel.trace("*")' + +- Users can use -DINTERRUPTIBLE=0 to prevent interrupt reentrancy in + their script, at the cost of a bit more overhead to toggle the + interrupt mask. + +- Added reentrancy debugging. If stap is run with the arguments + "-t -DDEBUG_REENTRANCY", additional warnings will be printed for + every reentrancy event, including the probe points of the + resident and interloper probes. + * What's new in version 0.9 - Typecasting is now supported using the @cast operator. A script can |