Hi, Masami -
masami.hiramatsu.pt wrote:
> Here is the version 6 of NOKPROBE_SYMBOL series. :)
> [...]
Some preliminary results from building these on top of tip/master on
x86-64.
# stap -te "probe kprobe.function("*") {}"
starts up OK, without crashes, which looks like great progress. But a
closer look indicates that the insertion of kprobes is taking about
three (!!) orders of magnitude longer than before, as judged by the
rate of increase of 'wc -l /sys/kernel/debug/kprobes/list'. So, one
has to let the thing run for several hours just to get all the kprobes
inserted, never mind letting stress-testing begin.
For reference, here's the steady-state "perf top" output during all this
insertion work:
54.81% [kernel] [k] _raw_spin_unlock_irqrestore
38.13% [kernel] [k] __slab_alloc
1.11% [kernel] [k] kprobe_ftrace_handler
0.88% [kernel] [k] _raw_spin_unlock_irq
More notes once the machine gets far enough to get to the robustness
testing phase.
- FChE
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