Michael, Thank you for your swift response. However, for the first part, I'm not sure what it means by "using" the full kernel source. How would I use it with lttng-modules?
As for the quick hack part, I grabbed the kernel source and copied the mount.h onto the folder you mentioned, and it did not help. I don't expect lttng to automatically find that file and use it; also there are no other header files in the package build directory. Could you kindly give us more instructions? Thanks, Mohammad On Wed, Jan 6, 2021 at 11:02 AM Michael Jeanson <mjean...@efficios.com> wrote: > 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 >
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