credit            617 gc/mark.c        int credit = HBLKSIZE;	/* Remaining credit for marking work	*/
credit            632 gc/mark.c        while (mark_stack_top >= mark_stack && credit >= 0) {
credit            634 gc/mark.c        while ((((ptr_t)mark_stack_top - (ptr_t)mark_stack) | credit)
credit            681 gc/mark.c                credit -= WORDS_TO_BYTES(WORDSZ/2); /* guess */
credit            698 gc/mark.c                credit -= GC_PROC_BYTES;
credit            742 gc/mark.c          credit -= (ptr_t)limit - (ptr_t)current_p;