* Masami Hiramatsu<mhiramat@xxxxxxxxxx> wrote:Masami Hiramatsu wrote:Masami Hiramatsu wrote:Ingo Molnar wrote:What we want here is two fold:
- enable kprobes event support when perf events is enabled and kprobes
is enabled. We dont want another config option for it.
Sure, at least that combination should enable kprobe-tracer forcibly.
Hmm, someone may not want to enables kprobe-tracer. Perhaps,
"default y if (EVENT_PROFILE)" is enough, isn't it?
Oops, this causes recursive dependency error :-(
kernel/trace/Kconfig:90:error: found recursive dependency: TRACING ->
EVENT_TRACING -> EVENT_PROFILE -> KPROBE_TRACER -> GENERIC_TRACER -> TRACING
This dependency problem can be resolved by simply making it 'default y'
- the option itself depends on KPROBES already, which is default-off -
so no need to also make it depend on EVENT_PROFILE.
btw., it would be nice to re-name it to 'KPROBE_EVENTS'. If the probe
point is used as a count - like in the __switch_to example i cited -
there's no tracing going on at all.