pt_buffer_region_size
if (buf->output_off + handle->size + 1 < pt_buffer_region_size(buf)) {
buf->output_off = head & (pt_buffer_region_size(buf) - 1);
buf->output_off == pt_buffer_region_size(buf))) {
pt_buffer_region_size(buf) - buf->output_off <= TOPA_PMI_MARGIN) {
pt_buffer_region_size(buf) -