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