taglinefilesource code
newtime757fs/buffer.cint newtime;
newtime761fs/buffer.cnewtime = jiffies + (flag ? bdf_prm.b_un.age_super : 
newtime763fs/buffer.cif(!buf->b_flushtime || buf->b_flushtime > newtime)
newtime764fs/buffer.cbuf->b_flushtime = newtime;