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I > mainly use LTTng to trace file system functions in the Linux kernel, and > for that I use the LTTng kernel probe feature, which works very well. > However, when I tried filtering logs for a specific group ID, I noticed > that filters are not supported for kernel probes. > > Then I attempted to use the tracking feature to trace only a specific > GID, but this also did not work. From what I see in my logs, it appears > that for kernel probes all events are captured and recorded, regardless > of the tracking options. > > I wanted to know if this is a known limitation, and whether there is any > in-progress work or reason why this is not currently supported. > I just tried on the master branch (since I had easy access to it), and wasn't able to reproduce a situation where I added the gid tracking and had results for a different gid in lttng view. > For reference, here is my code. I am using LTTng 2.13.11 with kernel > 6.8.0-101-generic: > > ``` #!/bin/sh > SESSION_NAME="lttng-gid-test" > OUTPUT_DIR="/tmp/lttng/${SESSION_NAME}" > GROUP_ID=1002 > > # create the lttng session > lttng create "$SESSION_NAME" -o "$OUTPUT_DIR" > > # create the lttng ring buffer channel > lttng enable-channel --session="$SESSION_NAME" --kernel channel0 \ > --subbuf-size=16M \ > --num-subbuf=2 > > # add pid, tid, proc, and gid for tracing collection > lttng add-context --session="$SESSION_NAME" --channel=channel0 --kernel > --type pid > lttng add-context --session="$SESSION_NAME" --channel=channel0 --kernel > --type gid > > # enable the target probe > lttng enable-event --session="$SESSION_NAME" --channel=channel0 --kernel > --probe=ext4_get_inode_loc ext4_get_inode_loc > > # disable all tracks # NOTE: untracking doesn't make a difference > # lttng untrack --session="$SESSION_NAME" --kernel --all --gid > # lttng untrack --session="$SESSION_NAME" --kernel --all --pid > # lttng untrack --session="$SESSION_NAME" --kernel --all --vpid > # lttng untrack --session="$SESSION_NAME" --kernel --all --uid > # lttng untrack --session="$SESSION_NAME" --kernel --all --vuid > # lttng untrack --session="$SESSION_NAME" --kernel --all --vgid > # only enable gid 1002 track > lttng track --kernel --gid=1002 > Could you check the output of your script after "lttng track --kernel --gid=1002"? The rest of your commands specify a session name, but this one does not. I wonder if it's selecting a different default session that the one you're expecting? > # start lttng lttng start $SESSION_NAME > > ``` > > Thank you for your time and guidance. > > Best regards, > Amir > > -- > *Amirhossein Najafizadeh* > *PhD Student, Computer Science Department, Stony Brook University, N.Y. > File systems and Storage Lab (FSL) > > * > najafizadeh21@gmail.com > https://amirhnajafiz.github.io/