On Wed, 9 Apr 2025 12:18:22 -0400 Mathieu Desnoyers <[email protected]> wrote:
> > The top level instance can set this option but it can not clear it, and > > it will bring the writing of the trace_marker back to its buffer. > > Why choose to redirect the top level trace marker from the global > buffer to the specific one rather than allow it to iterate on a > set of "interested" buffers ? Hmm, interesting idea. I guess we could do it that way instead, although it may cause a bit more overhead needing to keep track of the buffers that are interested and also make sure they do not disappear. I guess this could be done only in the write system call and the open doesn't get affected. I guess the list of "interested buffers" can be maintained by RCU, so that when a write happens, it writes to each interested buffer via a list_for_each_entry_rcu(), under a RCU read lock so that the buffers do not disappear when writing to them. Masami, what do you think? -- Steve
