P_HWPMC
p->p_flag |= P_HWPMC;
p->p_flag |= P_HWPMC;
p->p_flag &= ~P_HWPMC;
p->p_flag &= ~P_HWPMC;
is_using_hwpmcs = (p->p_flag & P_HWPMC) != 0;
p->p_flag |= P_HWPMC;
is_using_hwpmcs = (p->p_flag & P_HWPMC) != 0;
is_using_hwpmcs = (p1->p_flag & P_HWPMC) != 0;
newproc->p_flag |= P_HWPMC;
(__predict_false(p->p_flag & P_HWPMC))