Re: [PATCH V4] mm: fix kernel crash in khugepaged thread

[yalin wang]

> On Nov 16, 2015, at 22:25, Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> 
> On Mon, 16 Nov 2015 11:16:22 +0100
> Vlastimil Babka <vbabka@xxxxxxx> 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 donât 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 donât 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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