<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>Hi,<br></div><div><br data-mce-bogus="1"></div><div>The current LTTng kernel tracer (lttng-modules) supports Linux 3.0+ only.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>If you only need to trace user-space, you might be able to use lttng-tools and lttng-ust<br data-mce-bogus="1"></div><div>on an older kernel. Please refer to the README.md files of each project for information<br data-mce-bogus="1"></div><div>about their environment prerequisites.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>The RHEL6 kernel variant based on 2.6.32-2.6.35 Linux kernels has never been supported by<br data-mce-bogus="1"></div><div>the LTTng 2.x kernel tracers without kernel patching.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Thanks,<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Mathieu<br data-mce-bogus="1"></div><div><br></div><div><span id="zwchr" data-marker="__DIVIDER__">----- On Jul 29, 2019, at 8:34 PM, 杨海 <hai.yang@magic-shield.com> wrote:<br></span></div><div data-marker="__QUOTED_TEXT__"><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><span style="display:!important;float:none;background-color:transparent;color:rgb( 0 , 0 , 0 );font-family:'arial' , 'helvetica' , sans-serif;font-size:16px;font-style:normal;font-variant:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">Hi Mathieu,</span><br><div>Thanks. I am looking for packages for older distributions like CentOS 6 (with kernel 2.6) but could not find it. And which kernel version is minimum requirement for LTTng?</div><br><div>Regards</div><div>Hai</div><br><div style="color:#909090;font-family:'arial narrow';font-size:12px"><div><br><br></div></div><div><div style="font:'verdana' normal 14px;color:#000"><div style="font-size:12px;font-family:'arial narrow';padding:2px 0 2px 0">------------------ Original ------------------</div><div style="font-size:12px;background:#efefef;padding:8px"><div><b>From: </b> "Mathieu Desnoyers"<mathieu.desnoyers@efficios.com>;</div><div><b>Date: </b> Thu, Jul 25, 2019 11:48 PM</div><div><b>To: </b> "杨海"<hai.yang@magic-shield.com>; </div><div><b>Cc: </b> "Jonathan Rajotte"<jonathan.rajotte-julien@efficios.com>; "lttng-dev"<lttng-dev@lists.lttng.org>; </div><div><b>Subject: </b> Re: [lttng-dev] 回复:Re: 回复:Re: Pros and Cons of LTTng</div></div><div> </div><div><div style="font-family:'arial' , 'helvetica' , sans-serif;font-size:12pt;color:#000000"><div><span id="zwchr">----- On Jul 25, 2019, at 4:21 PM, 杨海 <hai.yang@magic-shield.com> wrote:<br></span></div><div><blockquote style="border-left:2px solid #1010ff;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:'helvetica' , 'arial' , sans-serif;font-size:12pt"><div>Hi</div><br><div>Thanks for quick response. </div><div>LTTng is really impressive on performance，especially under heavy workload. When using it on critical machines，stability is also essential. </div><div>I wonder how LTTng is commercialized and any products or OS distributions already enabled it. </div><div>I took a look at lttng-modules bug list，there are a few kernel oops years ago and got resolved. May I say it is very stable or it has not been fully tested? </div></blockquote><br><div>Hi,<br></div><br><div>EfficiOS has had commercial customers using LTTng in production for many years now.</div><div>LTTng per-se is distributed as packages in all major Linux distributions. EfficiOS also provides<br></div><div>more up-to-date packages for some distributions through <a href="http://packages.efficios.com/" target="_blank" rel="nofollow noopener noreferrer">http://packages.efficios.com/</a><br data-mce-bogus="1"></div><br><div>The way we commercialize LTTng is through funding for design and implementation of</div><div>customer's feature requests. We also provide commercial support tailored to specific</div><div>customer's environments, which includes SLA and continuous integration testing of specific</div><div>environments.<br></div><br><div>If those are services you are interested in, please feel free to contact us in private so we</div><div>can further discuss your needs.<br></div><br><div>Best regards,<br></div><br><div>Mathieu</div><br><blockquote style="border-left:2px solid #1010ff;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:'helvetica' , 'arial' , sans-serif;font-size:12pt"><br><div>regards</div><div>Hai<br><p><br><br></p><br><br>--------------原始邮件--------------<br>发件人："Jonathan Rajotte-Julien "<jonathan.rajotte-julien@efficios.com>;<br>发送时间：2019年7月23日(星期二) 上午6:20<br>收件人："杨海" <hai.yang@magic-shield.com>;<br>抄送："lttng-dev "<lttng-dev@lists.lttng.org>;<br>主题：Re: 回复:Re: [lttng-dev] Pros and Cons of LTTng<br>-----------------------------------<br></div> <div><div>Hi,<br><br>> As to LD_PRELOAD, it is also used for privilege escalation. Will it be regarded as vulnerability and forbidden on some Linux systems?<br><br>It could yes.<br>In that case you will be limited to the syscalls interface for the libc<br>observability unless you instrument it and distribute it.<br><br>Cheers.<br></div></div><br>_______________________________________________<br>lttng-dev mailing list<br>lttng-dev@lists.lttng.org<br>https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev<br></blockquote></div><br><div>-- <br></div><div>Mathieu Desnoyers<br>EfficiOS Inc.<br>http://www.efficios.com</div></div>
</div></div></div><br></blockquote></div><div><br></div><div data-marker="__SIG_POST__">-- <br></div><div>Mathieu Desnoyers<br>EfficiOS Inc.<br>http://www.efficios.com</div></div></body></html>