rb_page_commit
if (!head_page->page->time_stamp && rb_page_commit(head_page) == 0)
local_sub(rb_page_commit(to_remove_page), &cpu_buffer->entries_bytes);
return rb_page_commit(cpu_buffer->commit_page);
if (rb_page_commit(iter->head_page) & RB_MISSED_EVENTS)
local_sub(rb_page_commit(next_page), &cpu_buffer->entries_bytes);
rb_page_commit(cpu_buffer->commit_page) & ~RB_WRITE_MASK);
if (rb_page_commit(reader) & RB_MISSED_EVENTS)
commit = rb_page_commit(page);
commit = rb_page_commit(reader);