RELEASES.txt

Version 0.4 (Dec 9 2013)
-------------------------
= Highlight changes from v0.3

   * kernel symbol read (syntax: `symbol_name`)

   * parse symbol on uprobe (need libelf link)
        trace probe:/lib64/libc.so.6:malloc {}
        trace probe:/lib64/libc.so.6:malloc%return {}
        trace probe:/lib64/libc.so.6:* {} # trace all function in glibc

   * support static marker(SDT)
        trace sdt:/lib64/libc.so.6:setjmp {}
        trace sdt:/lib64/libc.so.6:* {} # trace all sdt in glibc        

   * support kprobe wildcard
        trace probe:vfs* {}

   * support run multiple ktap instances concurrently

   * add command option for list available events and symbols
        -le [glob]     : list pre-defined events in system
        -lf DSO        : list available functions from DSO
        -lm DSO        : list available sdt notes from DSO

   * better annotation for output of argname

   * basic FFI support (depend on CONFIG_KTAP_FFI)
        FFI will allow call kernel function from ktap script

        cdef [[ int printk(char *fmt, ...); ]]
        C.printk("this is ffi printk from ktap\n")

        (currently only support basic C types, structure support is ongoing)

   * New sample scripts
        userspace/malloc_size_hist.kp
        userspace/malloc_free.kp
        userspace/gcc_unwind.kp
        userspace/glibc_sdt.kp        #trace all static marker in glibc
        userspace/glibc_trace.kp      #trace all functions in glibc
        userspace/glibc_func_hist.kp  #show glibc functions in histogram
        syscalls/syslatl.kp           #syscall latency linear aggregation
        syscalls/syslist.kp           #syscall latency as a list with counts
        syscalls/opensnoop.kp         #trace open() syscalls and print basic details
        ffi/ffi_kmalloc.kp
        ffi/printk.kp
        ffi/sched_clock.kp

   * use amalgamation build as default
        x86_64 build: ktap binary size is 98K, ktapvm.ko size is 983K

   * Big cleanups and lots of bugfix


Version 0.3 (Oct 29 2013)
-------------------------
= Highlight changes from v0.2

   * Homepage released: www.ktap.org

   * Tutorial: http://www.ktap.org/doc/tutorial.html

   * Wiki: https://github.com/ktap/ktap/wiki

   * simple new tracing block syntax
	trace EVENTDEF { action }
	trace_end { action }

   * New event tracing keywords: argevent, argname, arg1..arg9
	trace "syscalls:*" function () {
		print(argevent)
	}

   * New timer block syntax
	tick-N { action }
	profile-N { action }

   * Basic aggregation support
	It's similar with systemtap, use "<<<" operator
	support aggregate function: count, sum, avg, max, min

   * Introduce new "+=" operator

   * Introduce sort_paris for table sort iteration

   * New sample scripts
	helloworld.kp
	syscalls/sctop.kp
	profiling/stack_profile.kp
	io/traceio.kp
	mem/kmalloc-top.kp
	syscalls/errinfo.kp
	schedule/schedtimes.kp
	game/tetris.kp

   * ansi library for sending ANSI escape sequences

	
   * statistics of ktapvm
	
   * Big cleanups and lots of bugfix

Version 0.2 (Jul 31 2013)
-------------------------

= Script highlight changes from v0.1

   * new tracing block syntax
	trace EVENTDEF function (e) { BODY }
	trace_end function (e) { BODY }

   * support trace filter
	trace 'sched:sched_switch /prev_comm == foo || next_comm == foo/

   * support kprobe/kretprobe
	trace "probe:do_sys_open dfd=%di filename=%dx flags=%cx mode=+4($stack)"
	trace "probe:do_sys_open%return fd=$retval"

   * support uprobe/uretprobe
	trace "probe:/lib/libc.so.6:0x000773c0"
	trace "probe:/lib/libc.so.6:0x000773c0%return"

   * support function tracing
	trace "ftrace:function /ip == mutex*/"

   * support oneline scripting
	ktap -e 'trace "syscalls:*" function (e) { print(e) }'

   * specific pid or cpu to tracing
	ktap -C cpu *.kp
	ktap -p pid *.kp

   * more sample scripts

   * support calling print_backtrace() in any context

   * support calling exit() in any context

= Backend highlight changes from v0.1

   * unified perf callback mechanism
   * use ring buffer transport instead of relayfs
   * reentrant in ktap tracing
   * performance boost(use percpu data in many case)
   * safe table/string manipulation
   * safe ktap exit
   * big code cleanups
   * fixed a lot of bugs, more stable than v0.1

Version 0.1 (May 21 2013)
-------------------------

    https://lwn.net/Articles/551253/