Messages in this thread | | | Date | Mon, 08 Apr 2013 18:29:28 +0900 | From | Masami Hiramatsu <> | Subject | Re: [PATCH 3/4] uprobes/tracing: Kill the pointless local_save_flags/preempt_count calls |
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(2013/04/06 0:01), Oleg Nesterov wrote: > On 04/05, Masami Hiramatsu wrote: >> >> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> > > Thanks! > > Masami, perhaps you can also answer the question I asked in 0/4 > marc.info/?l=linux-kernel&m=136458107403835 ? > > Off-topic question... Why uprobe_perf_func() passes "addr = ip" to > perf_trace_buf_submit() ? This just sets perf_sample_data->addr for > PERF_SAMPLE_ADDR, do we really need this? and we already have > perf_sample_data->ip initialized by perf. > > kprobe_perf_func() and kretprobe_perf_func() do the same. >
Good catch! I guess that I might misunderstood that it was used for sampling execution address. It should be replaced with (u64)0, as perf_trace_##call() does.
> Once again, I am just curious and this is completely offtopic.
Thank you :)
-- Masami HIRAMATSU IT Management Research Dept. Linux Technology Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: masami.hiramatsu.pt@hitachi.com
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