[lttng-dev] [PATCH lttng-modules] Container support for lttng-logger

Mathieu Desnoyers mathieu.desnoyers at efficios.com
Tue Dec 19 21:03:29 UTC 2017


----- On Dec 19, 2017, at 3:55 PM, St├ęphane Graber stgraber at ubuntu.com wrote:

> This adds a new /dev/lttng-logger interface to make it easy for
> containers to write to the lttng logger.
> 
> root at vm10:~/lttng-modules# ls -lh /dev/lttng-logger
> crw-rw-rw- 1 root root 10, 54 Dec 19 20:39 /dev/lttng-logger
> root at vm10:~/lttng-modules# ls -lh /proc/lttng-logger
> -rw-rw-rw- 1 root root 0 Dec 19 20:39 /proc/lttng-logger
> 
> root at vm10:~/lttng-modules# lxc config device add test lttng unix-char
> path=/dev/lttng-logger
> Device lttng added to test
> 
> root at vm10:~/lttng-modules# echo host-dev > /dev/lttng-logger
> root at vm10:~/lttng-modules# echo host-proc > /proc/lttng-logger
> root at vm10:~/lttng-modules# lxc exec test bash
> root at test:~# echo container-dev > /dev/lttng-logger
> 
> [20:42:56.627719300] (+?.?????????) vm10 lttng_logger: { cpu_id = 4 }, {
> _msg_length = 9, msg = "host-dev" }
> [20:42:58.145960910] (+1.518241610) vm10 lttng_logger: { cpu_id = 4 }, {
> _msg_length = 10, msg = "host-proc" }
> [20:43:01.123842390] (+2.977881480) vm10 lttng_logger: { cpu_id = 3 }, {
> _msg_length = 14, msg = "container-dev" }

It's great! The code looks good. The only thing missing before I can merge this
is adding tests under the lttng-tools tests/ directory.

Thanks,

Mathieu

> 
> 
> St├ęphane Graber (1):
>  Add a new /dev/lttng-logger interface
> 
> probes/lttng.c | 26 ++++++++++++++++++++++++--
> 1 file changed, 24 insertions(+), 2 deletions(-)
> 
> --
> 2.14.1

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com


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