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ring-buffer: Set new size of the ring buffer sub page
There are two approaches when changing the size of the ring buffer sub page: 1. Destroying all pages and allocating new pages with the new size. 2. Allocating new pages, copying the content of the old pages before destroying them. The first approach is easier, it is selected in the proposed implementation. Changing the ring buffer sub page size is supposed to not happen frequently. Usually, that size should be set only once, when the buffer is not in use yet and is supposed to be empty. Link: https://lore.kernel.org/linux-trace-devel/20211213094825.61876-5-tz.stoyanov@gmail.com Link: https://lore.kernel.org/linux-trace-kernel/20231219185628.588995543@goodmis.org Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Vincent Donnefort <vdonnefort@google.com> Cc: Kent Overstreet <kent.overstreet@gmail.com> Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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Tzvetomir Stoyanov (VMware)
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Steven Rostedt (Google)
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Dec 20, 2023
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