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

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Message-Id: <233209B0-A466-4149-93C6-7173FF0FD4C5@gmail.com>
Date:	Tue, 17 Nov 2015 10:21:47 +0800
From:	yalin wang <yalin.wang2010@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Vlastimil Babka <vbabka@...e.cz>, Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ebru Akagunduz <ebru.akagunduz@...il.com>,
	Rik van Riel <riel@...hat.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	jmarchan@...hat.com, mgorman@...hsingularity.net,
	willy@...ux.intel.com, linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org
Subject: Re: [PATCH V4] mm: fix kernel crash in khugepaged thread


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