From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 20739 invoked by alias); 13 Aug 2009 20:54:06 -0000 Received: (qmail 20634 invoked by uid 22791); 13 Aug 2009 20:54:04 -0000 X-SWARE-Spam-Status: No, hits=-0.8 required=5.0 tests=AWL,BAYES_00,J_CHICKENPOX_44,J_CHICKENPOX_64,J_CHICKENPOX_84,SPF_HELO_PASS,SPF_PASS X-Spam-Check-By: sourceware.org Received: from mx1.redhat.com (HELO mx1.redhat.com) (66.187.233.31) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 13 Aug 2009 20:53:57 +0000 Received: from int-mx1.corp.redhat.com (int-mx1.corp.redhat.com [172.16.52.254]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id n7DKrtYn015897 for ; Thu, 13 Aug 2009 16:53:55 -0400 Received: from ns3.rdu.redhat.com (ns3.rdu.redhat.com [10.11.255.199]) by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id n7DKrsrF014232 for ; Thu, 13 Aug 2009 16:53:54 -0400 Received: from [10.16.2.46] (dhcp-100-2-46.bos.redhat.com [10.16.2.46]) by ns3.rdu.redhat.com (8.13.8/8.13.8) with ESMTP id n7DKrqVd029087; Thu, 13 Aug 2009 16:53:52 -0400 Message-ID: <4A847E30.9050903@redhat.com> Date: Thu, 13 Aug 2009 20:54:00 -0000 From: Masami Hiramatsu User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1b3pre) Gecko/20090513 Fedora/3.0-2.3.beta2.fc11 Thunderbird/3.0b2 MIME-Version: 1.0 To: Ingo Molnar , Steven Rostedt , lkml CC: Ananth N Mavinakayanahalli , Avi Kivity , Andi Kleen , Christoph Hellwig , "Frank Ch. Eigler" , Frederic Weisbecker , "H. Peter Anvin" , Jason Baron , Jim Keniston , "K.Prasad" , Lai Jiangshan , Li Zefan , =?UTF-8?B?UHJ6ZW15c8WCYXdQYXdlxYJjenlr?= , Roland McGrath , Sam Ravnborg , Srikar Dronamraju , Tom Zanussi , Vegard Nossum , systemtap , kvm , DLE Subject: [TOOL] kprobestest : Kprobe stress test tool References: <20090813203403.31965.20973.stgit@localhost.localdomain> In-Reply-To: <20090813203403.31965.20973.stgit@localhost.localdomain> Content-Type: multipart/mixed; boundary="------------000702000009000002030102" X-IsSubscribed: yes Mailing-List: contact systemtap-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: systemtap-owner@sourceware.org X-SW-Source: 2009-q3/txt/msg00367.txt.bz2 This is a multi-part message in MIME format. --------------000702000009000002030102 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-length: 1476 This script tests kprobes to probe on all symbols in the kernel and finds symbols which must be blacklisted. Usage ----- kprobestest [-s SYMLIST] [-b BLACKLIST] [-w WHITELIST] Run stress test. If SYMLIST file is specified, use it as an initial symbol list (This is useful for verifying white list after diagnosing all symbols). kprobestest cleanup Cleanup all lists How to Work ----------- This tool list up all symbols in the kernel via /proc/kallsyms, and sorts it into groups (each of them including 64 symbols in default). And then, it tests each group by using kprobe-tracer. If a kernel crash occurred, that group is moved into 'failed' dir. If the group passed the test, this script moves it into 'passed' dir and saves kprobe_profile into 'passed/profiles/'. After testing all groups, all 'failed' groups are merged and sorted into smaller groups (divided by 4, in default). And those are tested again. This loop will be repeated until all group has just 1 symbol. Finally, the script sorts all 'passed' symbols into 'tested', 'untested', and 'missed' based on profiles. Note ---- - This script just gives us some clues to the blacklisted functions. In some cases, a combination of probe points will cause a problem, but each of them doesn't cause the problem alone. Thank you, -- Masami Hiramatsu Software Engineer Hitachi Computer Products (America), Inc. 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