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Hi Ananth, Will,
I can't explain this but this the output for my timing_kprobe, which my calculation yeilds 1 for both kprobe and jprobe
Apr 18 15:58:02 elm3b99 kernel: kprobe registered
Apr 18 15:58:02 elm3b99 kernel: plant jprobe at f8a002b0, handler addr f8a00030
Apr 18 15:58:12 elm3b99 kernel: kprobe start 5169729839300, stop 5170565252311
Apr 18 15:58:12 elm3b99 kernel: kprobe overhead count 1000000, number of cycles 835413011
Apr 18 15:58:14 elm3b99 kernel: jprobe start 5170565271260, stop 5171945384508
Apr 18 15:58:14 elm3b99 kernel: jprobe overhead count 1000000, number of cycles 1380113248
Apr 18 15:58:15 elm3b99 kernel: kprobe start 5171945399260, stop 5172780564338
Apr 18 15:58:15 elm3b99 kernel: kprobe overhead count 1000000, number of cycles 835165078
Apr 18 15:58:17 elm3b99 kernel: jprobe start 5172780578137, stop 5174156636912
Apr 18 15:58:17 elm3b99 kernel: jprobe overhead count 1000000, number of cycles 1376058775
Apr 18 15:58:17 elm3b99 kernel: kprobe unregistered
Apr 18 15:58:17 elm3b99 kernel: jprobe unregistered
Ananth N Mavinakayanahalli wrote:
Hi,
Here is the result of the tests I carried out to determine the cost of the multiple-kprobes feature. All tests were carried out on a uni PIII running at 732MHz.
I used Will's timing_kprobe and kprobe_multi modules on linux-2.6.12-rc2 for the tests.
(All values in microseconds)
Vanilla Single Multiple (2.6.12-rc2) Interface Interfaces ------------------------------------------------------------ kprobe 1.124 1.149 1.149 jprobe 1.891 1.885 1.885 kprobe_multi NA 1.306 1.387
Note: - Single Interface => linux-2.6.12-rc2 + take3 patch - Multiple Interfaces => linux-2.6.12-rc2 + take4 patch - kprobe_multi => averaged values with Will's kprobe_multi testcase
Thanks, Ananth
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