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* [SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-0.9.7-198-gf517ee2
@ 2009-06-09 0:02 jistone
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From: jistone @ 2009-06-09 0:02 UTC (permalink / raw)
To: systemtap-cvs
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the project "systemtap: system-wide probe/trace tool".
The branch, master has been updated
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via 0e14e0793ffb891bccd465cf518480685e3cd49e (commit)
from a77245e55075e1b756b51a5226483fe5e618940e (commit)
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- Log -----------------------------------------------------------------
commit f517ee24c58413f7de89ede71c728579c12ace5b
Author: Josh Stone <jistone@redhat.com>
Date: Mon Jun 8 16:37:00 2009 -0700
Remove dwflpp::default_name
It was just a basic NULL check, but creating its string temporaries was
causing a fair slowdown. Removing this function and adjusting the
callers shaves ~5% off the syscall.* elaboration time.
commit 0e14e0793ffb891bccd465cf518480685e3cd49e
Author: Josh Stone <jistone@redhat.com>
Date: Mon Jun 8 15:36:42 2009 -0700
Let query_module abort early for simple matches
query_module was already returning DW_CB_ABORT when a simple match was
found, but dwflpp::iterate_over_modules was ignoring that and instead
forcing the module loop to restart. The only way out of the loop was
with the pending_interrupts flag, which is only for signalled
interrupts.
Now iterate_over_modules will only attempt the dwfl_getmodules loop
once, since that loop will only abort if the CB returns DW_CB_ABORT.
Then query_module is also modified to return ABORT if pending_interrupts
is flagged.
My trusty test, stap -l syscall.*, is nearly 2x faster with this change.
Empirically, I found that the kernel object is always the first "module"
returned, so the syscall probepoints always gets to short-circuit the
loop right away.
-----------------------------------------------------------------------
Summary of changes:
dwflpp.cxx | 28 ++++++----------------------
dwflpp.h | 2 --
tapsets.cxx | 6 +++---
3 files changed, 9 insertions(+), 27 deletions(-)
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2009-06-09 0:02 [SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-0.9.7-198-gf517ee2 jistone
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