Re: [PATCH v20 00/10] ring-buffer: Making persistent ring buffers robust

[Masami Hiramatsu (Google) <mhiramat@kernel.org>]

On Wed, 20 May 2026 14:49:38 -0400
Steven Rostedt <rostedt@kernel.org> wrote:

> 
> Here is the 20th version of improvement patches for making persistent
> ring buffers robust to failures.
> The previous version is here:
> 
>  https://lore.kernel.org/all/177751968499.2136606.17388366710182662849.stgit@mhiramat.tok.corp.google.com/
> 
> None of the patches from the 19th version was changed. Only patches were
> added to it in this version. All of Masami's patches were in version 19,
> and all my patches are new to version 20. The reason I'm including
> Masami's patches with mine is so that Sashiko can handle all of them
> in one go.

Thanks for updating.

BTW, it seems Sashiko is stopping review this series. 
https://sashiko.dev/#/patchset/20260520184938.749337513%40kernel.org

Not sure why.

> 
> I moved patch 1 from v19 to my urgent branch as it was marked as
> fix for stable.
> 
> The patches I added:
> 
> - Fix an invalid sub-buffer in the iterator (added TBD fixes tag)
>   I didn't want to fold the patch into the patch that was fixed
>   as it was written by Masami.
> 
> - Have the dropped buffers be persistent across boots. Masami's patches
>   cleared the detection of lost subbuffers on boot up and the next
>   boot would not show them. If the persistent ring buffer isn't cleared
>   it should report the same info on subsequent boots.
> 
> - Show [LOST EVENTS] in persistent trace file where a subbuffer was
>   reset due to being invalid.
> 
> - Show [LOST EVENTS] in the persistent trace_pipe file as well.
> 
> Masami Hiramatsu (Google) (6):
>       ring-buffer: Skip invalid sub-buffers when validating persistent ring buffer
>       ring-buffer: Skip invalid sub-buffers when rewinding persistent ring buffer
>       ring-buffer: Add persistent ring buffer invalid-page inject test
>       ring-buffer: Show commit numbers in buffer_meta file
>       ring-buffer: Cleanup persistent ring buffer validation
>       ring-buffer: Cleanup buffer_data_page related code
> 
> Steven Rostedt (4):
>       ring-buffer: Skip invalid sub-buffers for iterator
>       ring-buffer: Have dropped subbuffers be persistent across reboots
>       ring-buffer: Show persistent buffer dropped events in trace file
>       ring-buffer: Show persistent buffer dropped events in trace_pipe file
> 
> ----
>  include/linux/ring_buffer.h |   1 +
>  kernel/trace/Kconfig        |  34 +++
>  kernel/trace/ring_buffer.c  | 538 +++++++++++++++++++++++++++++---------------
>  kernel/trace/trace.c        |   4 +
>  4 files changed, 397 insertions(+), 180 deletions(-)


-- 
Masami Hiramatsu (Google) <mhiramat@kernel.org>