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Notes from stap meeting 20060803
- From: Elena Zannoni <ezannoni at redhat dot com>
- To: systemtap at sources dot redhat dot com
- Date: Fri, 4 Aug 2006 14:44:18 -0400
- Subject: Notes from stap meeting 20060803
Will took notes this time
attaching on two fronts:
-modified version from spring (prassana addressing issues)
-utrace other approach (jim and ananth working on that of/on)
some effort testing utrace on s390
need priorities in notify structure maybe put into utrace
some issues building utrace testing structures
any request to test utrace on ppc64 from redhat?
dave wilder doing some testing, gdb on ptrace on utrace ppc64
performance measurements on userspace probes approaches
-still need to doing measurements on utrace
someone (anil?) is working on ia64 utrace
Need to agree on which tests to run for utrace testing
i386/x86_64 redhat (what is rh doing for testing?)
what is plan to get utrace upstream?
bz2091 why failing only on some power64 architectures
bug with itrace similar works on power5, crashes on power4
mike mason looking at this
redhat: david, will, elena
ibm: jim, david wilder
talked about inviting Mathieu Desnoyes
s390 kprobes should be in rawhide, hasn't been tested
dave wilder will test
any news about userspace probes?
working on getting gdb fixed with utrace
roland has a number of patches to clean things up
need to rerun tests
run tests in gdb source, might need to compare utrace results with
anil has been testing utrace ia64
elena says utrace incomplete on ia64, need some additional work
frysk uses other parts of utrace, and gdb testing single threaded
is there an strace testsuite?
prasanna persuing the two approaches.
prasanna has done some perf testing of earlier approach
nothing on utrace implementation
what are chances of getting into rhel5 in the next month?
gate is closing on rhel5. might get a few features in
have something that works (prasanna approach)
no code review in 3/4 weeks
less politically acceptable than utrace approach (jim)
want to know what kabis these patches will break
dave smith: cross compilation support module location information
resubmitted kernel patch, and got comments on it.
will submit upstream
what about testing it? need two machines?
also working on probe merge patch
can low module size significantly
success on i686 xen running of systemtap tests
discussion with stephane eranian about perfmon2 testing
moving testsuite into same package
adding examples into wiki
trying to get xen working
x86-64 both seems to work xen
timer.profile doesn't work (dynamic ticks) need to investigate
should xen get the registration to fail?
or have on dynamic tick code path
oprofile uses same hook, Will Cohen should check works
working on dashboard, collection of scripts other people found useful
dashboard for new users
eager to get additional scripts
how does gui chart data, documentation on this? uses regex
static kernel markers
frank: has there been any progress been porting block trace code
to static marker
satoshi: mentions static probe mechanism still have to be careful
with changing code at static marker. could cause fault
frank: no changes in code space to avoid these problems
tomz: where to get code to do this? stap_mark.h in systemtap
documented in man page? also described in ols paper
vara: do we want to put static tracing in rhel5?
frank doesn't see it happening
satoshi: lastest rawhide kernel split of debuginfo. which rpms are required?
yum install just the "kernel package name" -debuginfo