On Fri, 23 May 2025 16:54:25 -0400
Steven Rostedt <rost...@goodmis.org> wrote:
> I think we also need this:
>
> diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
> index 7d837963dd1e..456efebc396a 100644
> --- a/kernel/trace/ring_buffer.c
> +++ b/kernel/trace/ring_buffer.c
> @@ -3638,6 +3638,9 @@ rb_move_tail(struct ring_buffer_per_cpu *cpu_buffer,
>
> rb_reset_tail(cpu_buffer, tail, info);
>
> + /* The new page should have zero committed */
> + rb_init_page(next_page->page);
> +
> /* Commit what we have for now. */
> rb_end_commit(cpu_buffer);
> /* rb_end_commit() decs committing */
No we don't need it ;-)
I'm looking deeper into the code and we have this:
/*
* No need to worry about races with clearing out the commit.
* it only can increment when a commit takes place. But that
* only happens in the outer most nested commit.
*/
local_set(&next_page->page->commit, 0);
When the tail page gets moved.
-- Steve
