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Minutes of SystemTap Conference Call, Oct 20, 2005


Minutes of SystemTap Conference Call, Oct 20, 2005

Participants:
IBM:
       Ananth Mavinakayanahalli (mananth@in.ibm.com -- Boston)
       Jim Keniston (jkenisto@us.ibm.com -- Beaverton)
       Kevin Stafford (kevinrs@us.ibm.com -- Beaverton)
       Hien Nguyen (nguyhien@us.ibm.com -- Beaverton)
       Prasanna Panchamukhi (prasanna@in.ibm.com -- Bangalore)
Red Hat:
       Elena Zannoni (ezannoni@redhat.com -- Boston)
       Graydon Hoare (graydon@redhat.com -- Vancouver)
       Martin Hunt (hunt@redhat.com -- Seattle)
       Frank Eigler (fche@redhat.com -- Toronto)
       Will Cohen (wcohen@redhat.com -- Raleigh)
Intel:
       Josh Stone (joshua.i.stone@intel.com -- Santa Clara)
       Anil Keshavamurthy (anil.s.keshavamurthy@intel.com -- Hillsboro)
       Charles Spirakis (charles.spirakis@intel.com)
Hitachi:
       Satoshi Oshima (soshima@redhat.com)

Actions Required (ARs):
>From 5/19/05:

23. Jim, Martin: Ensure that the runtime's stack-trace feature works
   appropriately when there are return probes in the call stack.
   [Update: Martin is working on this.  Jim will prototype an improvement
   whereby the saved IP is updated before the handler is called.]

>From 6/9/05:
26. Rusty/Brad: Forward email address of Intel test person to Jay
   Turner.  [Update 10/6/05: Will be done now that Intel has Jay's email
   address: jkt@redhat.com]

>From 6/23/05:
30. Rusty: Review Will's rendition of Rusty's test that exercises
   probes on a wide variety of instruction types.
   [Update: As of 7/7/05, Will still needs to hear back from Rusty.]

>From 7/28/05:
41. Anil: Post a summary of known djprobes implementation issues.
   [Update 10/6/05: Defer at least until djprobes discussion settles
   down a bit.]

>From 8/11/05:
44. Tom: Automate relayfs tests and post them to mailing list.
   [Update: In progress]

>From 8/18/05:

53. Anil: Test RCU-based SMP scalability feature on ia64.
   [Update: continue testing on 32 way machine and post to ML]

>From 8/25/05:

55. Elena: Investigate approaches to making the full SystemTap bug
   list available to SystemTap developers outside Red Hat.

>From 9/8/05:

57. Martin: Runtime build issues fix or unlink documentation from Runtime webpage.

>From 9/22/05:

73. Prasanna: post user space probes paper to ML
   [Update: Will post to ML after 10/11-14/05 conference]

74. Ananth: post kprobes RCU patches to LKML, contingent upon resolution of
   BZ# 1345 and possibly others.
   [Done]

76. Hien: post dumpstack routine that solves kallsyms_lookup PPC issue.

77. Frank: post prototype to do symbol lookup in the translator. (alternative
to #76)


>From 9/29/05:

83. Kevin: Post SystemTap documentation, mirror examples on website.
   [Update: stap manpages mirrored on site, package requirement list
   to come (see #86)]

>From 10/6/05

84. Jim: Propose face-to-face meeting agenda, post document.
   [Update: Topic list posted to perftools-ML 10/10]

86. Kevin: Compile list of known SystemTap package requirements to post to
   website.
   [Update: internal review of list in progress]

87. Anil: Post feedback to Frank's "Next Steps" proposal.
   [DONE: 10/07]

>From 10/20/05

88. Ananth: Post RCU (smp scalability) patch changes from Paul's suggestions
   to cvs. Upon review/test post to LKML.
   [DONE]

89. Hien: Investigate new PPC64 stap symbol resolution mechanism.

90. Prasanna: Complete user-space probes (preferably RCU enhancement
   compliant) design/implementation in time for face-2-face.

91. Elena: Investigate solutions to elfutils license situation.

All are encouraged to do all SystemTap testing/development using kernel
2.6.14-rc4 + versions with the RCU scalability patches applied.

The face-2-face meeting is slotted for Nov. 15-16. Agenda TBD before the
meeting. (Jim/Frank request summary of concerns about user-space probes
before the meeting date)

RHEL4U3 deliverables were discussed.

SystemTap will remain a "technology preview" for the release of Update 3.

There are concerns about SystemTap's ability to run on non-RH distributions.
IBM will look into running STAP on Debian, SLES, etc. Another concern is about
licensing conflicts with elfutils. Elena is working on a solution.


--
Kevin Stafford
DES 2 | MS 2M3
Beaverton - OR
Linux Technology Center
IBM Systems & Technology
Phone: 1-503-578-3039
Email: kevinrs@us.ibm.com




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