On Fri, 18 Feb 2022 14:22:16 -0500 Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > Now to be able to do things like splice, and zero copy from the ring > buffer, when you read the ring buffer it swaps out a sub buffer from the > writable portion of the ring buffer and makes it into the "reader_page". > The reader page is now own by the reader, and will never be written to. I need to correct that statement about never being written to. It can be. If the current write head is on the page as it gets swapped out and becomes the reader page. A new write will happen on the reader page, but once the writer walks off the reader page and into the main ring buffer, it will never touch the reader page again. The read logic detects this, and will do copies of the page to send it to the user as it can not give the page itself to the user with the writer still on it. -- Steve
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