WORKINGSET_FILE
if (refaults != target_lruvec->refaults[WORKINGSET_FILE] ||
fraction[WORKINGSET_FILE] = fp;
target_lruvec->refaults[WORKINGSET_FILE] = refaults;
bucket_order[WORKINGSET_FILE] = max_order - timestamp_bits;
bucket_order[WORKINGSET_FILE], bucket_order[WORKINGSET_ANON]);