[lttng-dev] [PATCH lttng-modules 1/2] Fix: net: expose sk wmem in sock_exceed_buf_limit tracepoint (4.19)

[Michael Jeanson]

See upstream commit:

  commit d6f19938eb031ee2158272757db33258153ae59c
  Author: Yafang Shao <laoar.shao at gmail.com>
  Date:   Sun Jul 1 23:31:30 2018 +0800

    net: expose sk wmem in sock_exceed_buf_limit tracepoint

    Currently trace_sock_exceed_buf_limit() only show rmem info,
    but wmem limit may also be hit.
    So expose wmem info in this tracepoint as well.

    Regarding memcg, I think it is better to introduce a new tracepoint(if
    that is needed), i.e. trace_memcg_limit_hit other than show memcg info in
    trace_sock_exceed_buf_limit.

Signed-off-by: Michael Jeanson <mjeanson at efficios.com>
---
 instrumentation/events/lttng-module/sock.h | 23 +++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/instrumentation/events/lttng-module/sock.h b/instrumentation/events/lttng-module/sock.h
index 4bde039..a1032b3 100644
--- a/instrumentation/events/lttng-module/sock.h
+++ b/instrumentation/events/lttng-module/sock.h
@@ -22,7 +22,28 @@ LTTNG_TRACEPOINT_EVENT(sock_rcvqueue_full,
 	)
 )
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,15,0))
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0))
+
+LTTNG_TRACEPOINT_EVENT(sock_exceed_buf_limit,
+
+	TP_PROTO(struct sock *sk, struct proto *prot, long allocated, int kind),
+
+	TP_ARGS(sk, prot, allocated, kind),
+
+	TP_FIELDS(
+		ctf_string(name, prot->name)
+		ctf_array(long, sysctl_mem, prot->sysctl_mem, 3)
+		ctf_integer(long, allocated, allocated)
+		ctf_integer(int, sysctl_rmem, sk_get_rmem0(sk, prot))
+		ctf_integer(int, rmem_alloc, atomic_read(&sk->sk_rmem_alloc))
+		ctf_integer(int, sysctl_wmem, sk_get_wmem0(sk, prot))
+		ctf_integer(int, wmem_alloc, refcount_read(&sk->sk_wmem_alloc))
+		ctf_integer(int, wmem_queued, sk->sk_wmem_queued)
+		ctf_integer(int, kind, kind)
+	)
+)
+
+#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(4,15,0))
 
 LTTNG_TRACEPOINT_EVENT(sock_exceed_buf_limit,
 
-- 
2.17.1