On 07/16/2014 06:51 PM, Brendan Gregg wrote:
G'Day, I'm not sure where else to ask this; I don't think this functionality is in perf_events yet... kprobes is supposed to be able to handle string arguments, but I've not been able to find a single working example. I'm trying (on 3.16): # cd /sys/kernel/debug/tracing # echo 'r:getname getname $retval:string' > kprobe_events -bash: echo: write error: Invalid argument # echo 'p:myprobe do_sys_open %dx:string' > kprobe_events -bash: echo: write error: Invalid argument I'm following the syntax in Documentation/trace/kprobetrace.txt by Masami Hiramatsu, and it is recognizing "string". But I'm getting these errors: # dmesg | tail -4 [98021.813560] string type has no corresponding fetch method. [98021.813564] Parse error at argument[0]. (-22) [98705.956199] string type has no corresponding fetch method. [98705.956203] Parse error at argument[0]. (-22) Anyone seen this work? I'm checking the source... Thanks in advance,
Have you seen this: https://lkml.org/lkml/2014/6/19/698 David -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
