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| author | Cong Wang <xiyou.wangcong@gmail.com> | 2017-10-13 13:03:16 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-10-14 18:45:15 -0700 |
| commit | e086101b150ae8e99e54ab26101ef3835fa9f48d (patch) | |
| tree | 5eb147e546eac44c5dd83b7e5dd1c6263c7678eb /net | |
| parent | 657875944726af8f881df7d431afbbe8f50ad4d7 (diff) | |
| download | linux-e086101b150ae8e99e54ab26101ef3835fa9f48d.tar.gz linux-e086101b150ae8e99e54ab26101ef3835fa9f48d.tar.bz2 linux-e086101b150ae8e99e54ab26101ef3835fa9f48d.zip | |
tcp: add a tracepoint for tcp retransmission
We need a real-time notification for tcp retransmission
for monitoring.
Of course we could use ftrace to dynamically instrument this
kernel function too, however we can't retrieve the connection
information at the same time, for example perf-tools [1] reads
/proc/net/tcp for socket details, which is slow when we have
a lots of connections.
Therefore, this patch adds a tracepoint for __tcp_retransmit_skb()
and exposes src/dst IP addresses and ports of the connection.
This also makes it easier to integrate into perf.
Note, I expose both IPv4 and IPv6 addresses at the same time:
for a IPv4 socket, v4 mapped address is used as IPv6 addresses,
for a IPv6 socket, LOOPBACK4_IPV6 is already filled by kernel.
Also, add sk and skb pointers as they are useful for BPF.
1. https://github.com/brendangregg/perf-tools/blob/master/net/tcpretrans
Cc: Eric Dumazet <edumazet@google.com>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Brendan Gregg <bgregg@netflix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/net-traces.c | 1 | ||||
| -rw-r--r-- | net/ipv4/tcp_output.c | 3 |
2 files changed, 4 insertions, 0 deletions
diff --git a/net/core/net-traces.c b/net/core/net-traces.c index 1132820c8e62..f4e4fa2db505 100644 --- a/net/core/net-traces.c +++ b/net/core/net-traces.c @@ -31,6 +31,7 @@ #include <trace/events/napi.h> #include <trace/events/sock.h> #include <trace/events/udp.h> +#include <trace/events/tcp.h> #include <trace/events/fib.h> #include <trace/events/qdisc.h> #if IS_ENABLED(CONFIG_IPV6) diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 696b0a168f16..6c74f2a39778 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -42,6 +42,8 @@ #include <linux/gfp.h> #include <linux/module.h> +#include <trace/events/tcp.h> + /* People can turn this off for buggy TCP's found in printers etc. */ int sysctl_tcp_retrans_collapse __read_mostly = 1; @@ -2875,6 +2877,7 @@ int __tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb, int segs) if (likely(!err)) { TCP_SKB_CB(skb)->sacked |= TCPCB_EVER_RETRANS; + trace_tcp_retransmit_skb(sk, skb); } else if (err != -EBUSY) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPRETRANSFAIL); } |