From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f54.google.com (mail-pa0-f54.google.com [209.85.220.54]) by kanga.kvack.org (Postfix) with ESMTP id 5C9866B0253 for ; Mon, 16 Nov 2015 21:21:56 -0500 (EST) Received: by padhx2 with SMTP id hx2so194459727pad.1 for ; Mon, 16 Nov 2015 18:21:56 -0800 (PST) Received: from mail-pa0-x236.google.com (mail-pa0-x236.google.com. [2607:f8b0:400e:c03::236]) by mx.google.com with ESMTPS id ba4si54406792pbb.20.2015.11.16.18.21.55 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 16 Nov 2015 18:21:55 -0800 (PST) Received: by padhx2 with SMTP id hx2so194459470pad.1 for ; Mon, 16 Nov 2015 18:21:55 -0800 (PST) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.0 \(3094\)) Subject: Re: [PATCH V4] mm: fix kernel crash in khugepaged thread From: yalin wang In-Reply-To: <20151116092501.761f31d7@gandalf.local.home> Date: Tue, 17 Nov 2015 10:21:47 +0800 Content-Transfer-Encoding: quoted-printable Message-Id: <233209B0-A466-4149-93C6-7173FF0FD4C5@gmail.com> References: <1447316462-19645-1-git-send-email-yalin.wang2010@gmail.com> <20151112092923.19ee53dd@gandalf.local.home> <5645BFAA.1070004@suse.cz> <20151113090115.1ad4235b@gandalf.local.home> <2F74FF6B-66DC-4BF9-972A-C2F5FFFA979F@gmail.com> <5649ACF6.1000704@suse.cz> <20151116092501.761f31d7@gandalf.local.home> Sender: owner-linux-mm@kvack.org List-ID: To: Steven Rostedt Cc: Vlastimil Babka , Ingo Molnar , Andrew Morton , Ebru Akagunduz , Rik van Riel , "Kirill A. Shutemov" , jmarchan@redhat.com, mgorman@techsingularity.net, willy@linux.intel.com, linux-kernel , linux-mm@kvack.org > On Nov 16, 2015, at 22:25, Steven Rostedt wrote: >=20 > On Mon, 16 Nov 2015 11:16:22 +0100 > Vlastimil Babka wrote: >>=20 >>>> -- Steve =20 >>> 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=E2=80=99t = know how to print this string . =20 >>=20 >> Does it work through trace-cmd? >=20 > The two use the same code. If it works in one, it will work in the > other. >=20 > -- Steve >=20 i have not tried , just a question, if you print a %s , but don=E2=80=99t 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org