Method getCommitOverhead

fdbserver/DiskQueue.actor.cpp:945–955

Always commit an entire page. Commit overhead is the unused space in a to-be-committed page

	// Always commit an entire page. Commit overhead is the unused space in a to-be-committed page
	int getCommitOverhead() const override {
		if (!pushedPageCount()) {
			if (!anyPopped)
				return 0;

			// To mark pages are poped, we push an empty page to specify that following pages were poped.
			// maxPayLoad is the max. payload size, i.e., (page_size - page_header_size).
			return Page::maxPayload;
		} else
			return backPage().remainingCapacity();
	}

	Future<Void> commit() override {
		ASSERT(recovered);