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Date: Tue, 04 Aug 2009 21:28:23 -0700 From: Josh Stone <jistone@...hat.com> To: SystemTap <systemtap@...rceware.org> CC: LKML <linux-kernel@...r.kernel.org>, LWN <lwn@....net> Subject: SystemTap release 0.9.9 The SystemTap team proudly announces release 0.9.9. faster script compilation, improved userspace probing, support for new DWARF_OPs, self-monitoring markers, enhanced variable access, new SNMP tapset, new dentry tapset, bug fixes, and more! = Where to get it http://sourceware.org/systemtap/ - our project page http://sourceware.org/systemtap/ftp/releases/systemtap-0.9.9.tar.gz http://koji.fedoraproject.org/koji/packageinfo?packageID=615 git tag release-0.9.9 (commit 1e9b189f) = How to build it See the README and NEWS files at http://sourceware.org/git/?p=systemtap.git;a=tree Further information at http://sourceware.org/systemtap/wiki/ = SystemTap frontend (stap) changes - Translation pass 2 is significantly faster by avoiding unnecessary searching through a kernel build/module directory tree. - SystemTap now has userspace markers in its own binaries, and the stap tapset provides the available probepoints and local variables. - Systemwide kernel .function.return (kretprobe) maxactive defaults may be overridden with the -DKRETACTIVE=nnn parameter. - When compiled against elfutils 0.142 systemtap now handles the new DW_OP_call_frame_CFA generated by by GCC. - Dwarf probes now show parameters and local variables in the verbose listing mode (-L). - User space PROBE marks are not always found with or without separate debuginfo. The .probes section itself is now always put in the main elf file and marked as allocated. When when building pic code the section is marked writable. fixes the selinux memory check problems seen with programs using STAP_PROBES. - The stapgraph application can generate graphs of data and events emitted by systemtap scripts in real time. Run "stapgraph testsuite/systemtap.examples/general/grapher.stp" for an example of graphing the system load average and keyboard events. = SystemTap script language changes - The syntax for dereferencing $target variables and @cast() gained new capabilities: - Array indexes can now be arbitrary numeric expressions. - Array subscripts are now supported on pointer types. - An '&' operator before a @cast or $target returns the address of the final component, especially useful for nested structures. = SystemTap tapset changes - statement() probes can now override "address not at start of statement" errors in guru mode. They also provide alternative addresses to use in non-guru mode. - Symbol aliases are now resolved to their canonical dwarf names. For example, probing "malloc" in libc resolves to "__libc_malloc". - For reading all probe variables, kernel.mark now supports $$vars and $$parms, and process.syscall now supports $$vars. - The SNMP tapset provides probes and functions for many network statistics. See stapprobes.snmp(3stap) for more details. - The dentry tapset provides functions to map kernel VFS directory entries to file or full path names: d_path(), d_name() and reverse_path_walk(). - uprobes and ustack() are more robust when used on applications that depend on prelinked/separate debuginfo shared libraries. - Miscellaneous new tapset functions: - pgrp() returns the process group ID of the current process - str_replace() performs string replacement = New script examples - locks/bkl.stp Tracing contention on Big Kernel Lock - locks/bkl_stats.stp Per-process statistics on Big Kernel Lock - memory/numa_faults.stp Summarize process misses across NUMA nodes - network/autofs4.stp Watch autofs4 operations - network/sk_stream_wait_memory.stp Watch for filled network buffers - network/tcpipstat.stp Display network statistics for TCP sockets - process/chng_cpu.stp Monitor changes in processor executing a task - process/forktracker.stp Trace creation of processes - process/migrate.stp Track the migration of specific executables = Code contributors for this release Dave Brolley, David J. Wilder, David Smith, Don Domingo, Eugeniy Meshcheryakov, Frank Ch. Eigler, Jeff Moyer, Josh Stone, Kent Sebastian, Mark Wielaard, Masami Hiramatsu, Przemysław Pawełczyk, Robb Romans, Roland McGrath, Stan Cox, Tim Moore, Varun Chandramohan, Wenji Huang, William Cohen = Examples of tested kernel versions 2.6.18 (el5/ia64/i686/x86_64) 2.6.27.25 (f10/i686/x86_64) 2.6.29.5 (f11/i686/x86_64) 2.6.31 (i686/x86_64) = Known issues with this release Some kernel crashes continue to be reported when a script probes broad kernel function wildcards. = Bugs fixed for this release 2049 revise $target->subfield syntax 3498 speed up pass-2/3 via elfutils report_..._offline predicate 4166 Should support array-like indexing on $pointer variables 5930 need construct for $context variable address 9908 uprobes-free user-space markers 10075 emit more error message details in probe registration logic 10182 systemtap.spec should clean up old leftover runtime/uprobes/ 10185 stap uprobe script on rawhide causes system crash 10258 procfs probes should not put strings on kernel stack 10273 uprobes fail to insert on prelinked library 10274 exelib optimized builds don't work 10277 some utf-8 chars (in script path names etc.) not escaped 10279 allow general override of kretprobe maxactive 10285 user space PROBE marks aren't found with separate debuginfo 10298 bring back NULL 10305 mark probes fail on prelinked shared library 10307 beginning of statement check should be overridden in guru mode 10308 beginning of statement check should provide alternatives 10313 Build error due to a deprecation in elfutils 10323 some ustack exelib.exp tests fail with prelinked shared libs 10327 follow symbol aliases for debuginfo search 10329 fix sdt.h license 10335 systemtap.base/strftime.exp hangs 10348 Compilation failure with gcc snapshot: switch jumps over init 10381 sdt.h macros create relocatable addresses in non-writable sect. 10386 itrace tests fail on 2.6.31-rc2 unknown symbol find_task_by_vpid 10388 Support DW_OP_call_frame_cfa 10398 DW_OP_call_frame CFA support doesn't work for prelink so's 10399 dtrace should obey prefix install path 10410 Add jmoyer's autofs4 / dentry scripts 10421 task.stp pid2task tapset function fails on 2.6.31-0.67.rc2 10424 All tracepoints are unusable if any one header is bad 10427 Multiple tracepoint OKs! 10453 crash testcase always fail because testlog.stp has been removed 10458 uaddr() returns one past current instruction for uprobes 10459 -w should squelch all warnings 10475 pointer-array confused about array element size = Test results on various systems After running "sudo make installcheck" from the test suite, on a suitably equipped machine (kernel debugging data and other stuff installed), you should see 1100-1200 passes and a small handful of failures. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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