taglinefilesource code
when47include/linux/skbuff.hvolatile unsigned long  when;  /* used to compute rtt's  */
when1805net/inet/ip.cskb->when = jiffies;
when508net/inet/skbuff.cn->when=skb->when;
when422net/inet/tcp.cskb->when = jiffies;
when515net/inet/tcp.cstatic void reset_xmit_timer(struct sock *sk, int why, unsigned long when)
when519net/inet/tcp.cif((int)when < 0)
when521net/inet/tcp.cwhen=3;
when524net/inet/tcp.csk->retransmit_timer.expires=when;
when708net/inet/tcp.cif (jiffies < skb->when + sk->rto) 
when710net/inet/tcp.creset_xmit_timer (sk, TIME_WRITE, skb->when + sk->rto - jiffies);
when3424net/inet/tcp.cm = jiffies - oskb->when;  /* RTT */
when3679net/inet/tcp.c(sk->send_head->when + sk->rto < jiffies))) 
when3681net/inet/tcp.cif(sk->send_head->when + sk->rto < jiffies)
when179net/inet/timer.cif (jiffies < skb->when + sk->rto) 
when181net/inet/timer.creset_timer (sk, TIME_WRITE, skb->when + sk->rto - jiffies);