Re: 回复:Re: 回复:Re: 回复:Re: Pros and Cons of LTTng

* Re: 回复:Re:  回复:Re:  回复:Re: Pros and Cons of LTTng
       [not found] <tencent_7650B3E62F4AC4C75D42A69A@qq.com>
@ 2019-08-20 16:02 ` Jonathan Rajotte-Julien
       [not found] ` <20190820160220.GA31760@joraj-alpa>
  1 sibling, 0 replies; 9+ messages in thread
From: Jonathan Rajotte-Julien @ 2019-08-20 16:02 UTC (permalink / raw)
  To: 杨海; +Cc: lttng-dev

Hi Hai,

Sorry for the delay.

The main obstruction to kernel tracing support for RHEL6 is indeed the kernel.

Note that we dropped the patches in the master branch:

  commit ca2fca6b64297227b2565773a495803aa90c148e
  Author: Michael Jeanson <mjeanson@efficios.com>
  Date:   Thu Nov 8 15:24:01 2018 -0500

      Drop compat patches for kernels < 2.6.36

      Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
      Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Still, the stable 2.10 branch still carries the patches that you would need [1].
As previously mentioned, those patches might not apply cleanly since it has
been a while any effort was put in testing against RHEL6.

[1] https://github.com/lttng/lttng-modules/tree/stable-2.10/linux-patches

Cheers

On Fri, Aug 09, 2019 at 07:44:57AM +0800, 杨海 wrote:
> Hi Mathieu,
> 
> We aim to trace SYSCALL in kernel space. In general, what would be the obstacles to support RHEL6? Or what are key kernel patches to be necessary? 
> 
> 
> Regards
> Hai 
> 
> 
> 
> 
> 
> 
> 
> --------------原始邮件--------------
> 发件人："Mathieu Desnoyers "<mathieu.desnoyers@efficios.com>;
> 发送时间：2019年7月30日(星期二) 晚上10:04
> 收件人："杨海" <hai.yang@magic-shield.com>;
> 抄送："Jonathan Rajotte "<jonathan.rajotte-julien@efficios.com>;"lttng-dev "<lttng-dev@lists.lttng.org>;
> 主题：Re: [lttng-dev] 回复:Re:  回复:Re:  Pros and Cons of LTTng
> -----------------------------------
> 
>  Hi,
> 
> 
> 
> The current LTTng kernel tracer (lttng-modules) supports Linux 3.0+ only.
> 
> 
> 
> If you only need to trace user-space, you might be able to use lttng-tools and lttng-ust
> 
> on an older kernel. Please refer to the README.md files of each project for information
> 
> about their environment prerequisites.
> 
> 
> 
> The RHEL6 kernel variant based on 2.6.32-2.6.35 Linux kernels has never been supported by
> 
> the LTTng 2.x kernel tracers without kernel patching.
> 
> 
> 
> Thanks,
> 
> 
> 
> Mathieu
> 
> 
> 
> ----- On Jul 29, 2019, at 8:34 PM, 杨海 <hai.yang@magic-shield.com> wrote:
> 
> Hi Mathieu,
> 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?
> 
> Regards
> Hai
> 
> 
> 
> 
> 
> ------------------ Original ------------------
> From:  "Mathieu Desnoyers"<mathieu.desnoyers@efficios.com>;
> Date:  Thu, Jul 25, 2019 11:48 PM
> To:  "杨海"<hai.yang@magic-shield.com>; 
> Cc:  "Jonathan Rajotte"<jonathan.rajotte-julien@efficios.com>; "lttng-dev"<lttng-dev@lists.lttng.org>; 
> Subject:  Re: [lttng-dev] 回复:Re:  回复:Re:  Pros and Cons of LTTng
> 
>  
> ----- On Jul 25, 2019, at 4:21 PM, 杨海 <hai.yang@magic-shield.com> wrote:
> 
> Hi
> 
> Thanks for quick response. 
> LTTng is really impressive on performance，especially under heavy workload. When using it on critical machines，stability is also essential. 
> I wonder how LTTng is commercialized and any products or OS distributions already enabled it. 
> 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? 
> 
> Hi,
> 
> 
> EfficiOS has had commercial customers using LTTng in production for many years now.
> LTTng per-se is distributed as packages in all major Linux distributions. EfficiOS also provides
> 
> more up-to-date packages for some distributions through http://packages.efficios.com/
> 
> 
> The way we commercialize LTTng is through funding for design and implementation of
> customer's feature requests. We also provide commercial support tailored to specific
> customer's environments, which includes SLA and continuous integration testing of specific
> environments.
> 
> 
> If those are services you are interested in, please feel free to contact us in private so we
> can further discuss your needs.
> 
> 
> Best regards,
> 
> 
> Mathieu
> 
> 
> regards
> Hai
> 
> 
> 
> 
> 
> 
> --------------原始邮件--------------
> 发件人："Jonathan Rajotte-Julien "<jonathan.rajotte-julien@efficios.com>;
> 发送时间：2019年7月23日(星期二) 上午6:20
> 收件人："杨海" <hai.yang@magic-shield.com>;
> 抄送："lttng-dev "<lttng-dev@lists.lttng.org>;
> 主题：Re:  回复:Re: [lttng-dev] Pros and Cons of LTTng
> -----------------------------------
> 
>  Hi,
> 
> > As to LD_PRELOAD, it is also used for privilege escalation. Will it be regarded as vulnerability and forbidden on some Linux systems?
> 
> It could yes.
> In that case you will be limited to the syscalls interface for the libc
> observability unless you instrument it and distribute it.
> 
> Cheers.
> 
> 
> 
> _______________________________________________
> lttng-dev mailing list
> lttng-dev@lists.lttng.org
> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> 
> 
> -- 
> 
> Mathieu Desnoyers
> EfficiOS Inc.
> http://www.efficios.com
> 
>  
> 
> 
> 
> 
> 
> 
> -- 
> 
> Mathieu Desnoyers
> EfficiOS Inc.
> http://www.efficios.com

-- 
Jonathan Rajotte-Julien
EfficiOS
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