ring-buffer: Skip invalid sub-buffers when rewinding persistent ring buffer

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Skip invalid sub-buffers when rewinding the persistent ring buffer
instead of stopping the rewinding the ring buffer. The skipped
buffers are cleared.

To ensure the rewinding stops at the unused page, this also clears
buffer_data_page::time_stamp when tracing resets the buffer. This
allows us to identify unused pages and empty pages.

Link: https://patch.msgid.link/20260522171051.091265852@kernel.org
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
[ SDR: Have reader_page still get evaluated if header_page fails ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

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Masami Hiramatsu (Google) 2026-05-22 13:08:59 -04:00 • committed by Steven Rostedt

parent eb3bd277b3

commit c8a7d4b472

1 changed files with 69 additions and 38 deletions

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kernel/trace/ring_buffer.c

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