rb_page_size
iter->head == rb_page_size(cpu_buffer->reader_page)));
if (cpu_buffer->reader_page->read < rb_page_size(reader))
cpu_buffer->reader_page->read > rb_page_size(reader)))
if (iter->next_event >= rb_page_size(iter->head_page)) {
if (iter->head >= rb_page_size(iter->head_page)) {
commit = rb_page_size(reader);
cpu_buffer->read_bytes += rb_page_size(reader);
reader_size = rb_page_size(cpu_buffer->reader_page);
commit = rb_page_size(reader);