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Using page order for deciding what the size of the ring buffer sub buffers
are is exposing a bit too much of the implementation. Although the sub
buffers are only allocated in orders of pages, allow the user to specify
the minimum size of each sub-buffer via kilobytes like they can with the
buffer size itself.
If the user specifies 3 via:
echo 3 > buffer_subbuf_size_kb
Then the sub-buffer size will round up to 4kb (on a 4kb page size system).
If they specify:
echo 6 > buffer_subbuf_size_kb
The sub-buffer size will become 8kb.
and so on.
Link: https://lore.kernel.org/linux-trace-kernel/20231219185631.809766769@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: Tzvetomir Stoyanov <tz.stoyanov@gmail.com>
Cc: Vincent Donnefort <vdonnefort@google.com>
Cc: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
2f84b39f48