On 2021-01-06 10 h 50, Mohammad Kavousi via lttng-dev wrote:
Dear LTTng developers,
Our group at Northwestern has been using your amazing tool for the
purpose of provenance tracking on Linux-based systems and we are very
fond of the performance and accuracy it provides.
Our analysis shows that mnt_ns context is supported in the 2.12 version
of LTTng. However, though, adding the mnt_ns context using
the add-context command produces this error:
Error: mnt_ns: Context unavailable on this kernel
We have tried adding the context to the more recent version of the
kernel (5.8) on Ubuntu 20.04, as well as older kernel versions such as
the 4.4 version on Ubuntu 16.04. However, we always receive the above
error trying to add the mnt_ns context.
We could not find which kernel versions are supported for adding this
context, or whether they need to be built with special flags. I would
appreciate your guidance on resolving this issue.
Thank you,
Mohammad
Hi,
Unfortunately the definition of 'struct mnt_namespace' is in a private
kernel header (fs/mount.h) unlike other namespaces. Private headers are
not included in the kernel headers package of distributions like Ubuntu,
to build support for this namespace context in lttng-modules you need to
use the full kernel source tree.
Or as a quick hack, you could copy 'fs/mount.h' from the original source
tree to your kernel headers package build directory, which on Ubuntu is
usually '/lib/modules/$(uname -r)/build'.
Hoe this helps,
Michael
_______________________________________________
lttng-dev mailing list
lttng-dev@lists.lttng.org
https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
