On Wed, May 3, 2023 at 6:35 PM Tejun Heo [off-list ref] wrote:

Hello, Kent.

On Wed, May 03, 2023 at 04:05:08AM -0400, Kent Overstreet wrote:

quoted

No, we're still waiting on the tracing people to _demonstrate_, not
claim, that this is at all possible in a comparable way with tracing.

So, we (meta) happen to do stuff like this all the time in the fleet to hunt
down tricky persistent problems like memory leaks, ref leaks, what-have-you.
In recent kernels, with kprobe and BPF, our ability to debug these sorts of
problems has improved a great deal. Below, I'm attaching a bcc script I used
to hunt down, IIRC, a double vfree. It's not exactly for a leak but leaks
can follow the same pattern.

For leaks there is example bcc
https://github.com/iovisor/bcc/blob/master/tools/memleak.py