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 <mjean...@efficios.com>
Date: Thu Nov 8 15:24:01 2018 -0500
Drop compat patches for kernels < 2.6.36
Signed-off-by: Michael Jeanson <mjean...@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoy...@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.desnoy...@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.y...@magic-shield.com>;
> 抄送："Jonathan Rajotte "<jonathan.rajotte-jul...@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.y...@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.desnoy...@efficios.com>;
> Date: Thu, Jul 25, 2019 11:48 PM
> To: "杨海"<hai.y...@magic-shield.com>;
> Cc: "Jonathan Rajotte"<jonathan.rajotte-jul...@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.y...@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-jul...@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.y...@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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