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

From	yalin wang <yalin.wang2010@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH V4] mm: fix kernel crash in khugepaged thread
Date	2015-11-17 03:30 +0100
Message-ID	<qvEbT-7dm-5@gated-at.bofh.it> (permalink)
References	(3 earlier) <qulbk-5Uo-9@gated-at.bofh.it> <qund8-7qr-17@gated-at.bofh.it> <qvgVX-M3-11@gated-at.bofh.it> <qvp3d-62P-25@gated-at.bofh.it> <qvsX8-8rn-21@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

> On Nov 16, 2015, at 22:25, Steven Rostedt <rostedt@goodmis.org> wrote:
> 
> On Mon, 16 Nov 2015 11:16:22 +0100
> Vlastimil Babka <vbabka@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 .

Thanks--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Thread

Re: [PATCH V4] mm: fix kernel crash in khugepaged thread Steven Rostedt <rostedt@goodmis.org> - 2015-11-16 15:30 +0100
  Re: [PATCH V4] mm: fix kernel crash in khugepaged thread yalin wang <yalin.wang2010@gmail.com> - 2015-11-17 03:30 +0100
    Re: [PATCH V4] mm: fix kernel crash in khugepaged thread Steven Rostedt <rostedt@goodmis.org> - 2015-11-17 03:50 +0100
      Re: [PATCH V4] mm: fix kernel crash in khugepaged thread yalin wang <yalin.wang2010@gmail.com> - 2015-11-17 05:00 +0100
        Re: [PATCH V4] mm: fix kernel crash in khugepaged thread Vlastimil Babka <vbabka@suse.cz> - 2015-11-17 08:50 +0100

csiph-web