> On Nov 16, 2015, at 22:25, Steven Rostedt <rost...@goodmis.org> wrote: > > On Mon, 16 Nov 2015 11:16:22 +0100 > Vlastimil Babka <vba...@suse.cz> wrote: >> >>>> -- Steve >>> it is not easy to print for perf tools in userspace , >>> if you use this format , >>> for user space perf tool, it print the entry by look up the member in entry >>> struct by offset , >>> you print a dynamic string which user space perf tool don’t know how to >>> print this string . >> >> Does it work through trace-cmd? > > The two use the same code. If it works in one, it will work in the > other. > > -- Steve > i have not tried , just a question, if you print a %s , but don’t call trace_define_field() do define this string in __entry , how does user space perf tool to get this string info and print it ? i am curious .. i can try this when i have time. and report to you .
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