Imported linux-2.6.27.39 suse/xen patches.

[ipfire-2.x.git] / src / patches / suse-2.6.27.39 / patches.trace / lttng-instrumentation-ipv4.patch

diff --git a/src/patches/suse-2.6.27.39/patches.trace/lttng-instrumentation-ipv4.patch b/src/patches/suse-2.6.27.39/patches.trace/lttng-instrumentation-ipv4.patch
new file mode 100644 (file)
index 0000000..813350f
--- /dev/null
+++ b/src/patches/suse-2.6.27.39/patches.trace/lttng-instrumentation-ipv4.patch
@@ -0,0 +1,81 @@
+From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+Subject: LTTng instrumentation - ipv4
+
+Original patch header:
+  LTTng instrumentation - ipv4
+  
+  Keep track of interface up/down for ipv4. Allows to keep track of interface
+  address changes in a trace.
+  
+  Those tracepoints are used by LTTng.
+  
+  About the performance impact of tracepoints (which is comparable to markers),
+  even without immediate values optimizations, tests done by Hideo Aoki on ia64
+  show no regression. His test case was using hackbench on a kernel where
+  scheduler instrumentation (about 5 events in code scheduler code) was added.
+  See the "Tracepoints" patch header for performance result detail.
+  
+  Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+  CC: netdev@vger.kernel.org
+  CC: David S. Miller <davem@davemloft.net>
+  CC: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
+  CC:
+  CC: Masami Hiramatsu <mhiramat@redhat.com>
+  CC: 'Peter Zijlstra' <peterz@infradead.org>
+  CC: "Frank Ch. Eigler" <fche@redhat.com>
+  CC: 'Ingo Molnar' <mingo@elte.hu>
+  CC: 'Hideo AOKI' <haoki@redhat.com>
+  CC: Takashi Nishiie <t-nishiie@np.css.fujitsu.com>
+  CC: 'Steven Rostedt' <rostedt@goodmis.org>
+  CC: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
+
+Acked-by: Jan Blunck <jblunck@suse.de>
+--- 
+---
+ include/trace/ipv4.h |   14 ++++++++++++++
+ net/ipv4/devinet.c   |    3 +++
+ 2 files changed, 17 insertions(+)
+
+--- /dev/null
++++ b/include/trace/ipv4.h
+@@ -0,0 +1,14 @@
++#ifndef _TRACE_IPV4_H
++#define _TRACE_IPV4_H
++
++#include <linux/inetdevice.h>
++#include <linux/tracepoint.h>
++
++DEFINE_TRACE(ipv4_addr_add,
++      TPPROTO(struct in_ifaddr *ifa),
++      TPARGS(ifa));
++DEFINE_TRACE(ipv4_addr_del,
++      TPPROTO(struct in_ifaddr *ifa),
++      TPARGS(ifa));
++
++#endif
+--- a/net/ipv4/devinet.c
++++ b/net/ipv4/devinet.c
+@@ -61,6 +61,7 @@
+ #include <net/ip_fib.h>
+ #include <net/rtnetlink.h>
+ #include <net/net_namespace.h>
++#include <trace/ipv4.h>
+ 
+ static struct ipv4_devconf ipv4_devconf = {
+       .data = {
+@@ -257,6 +258,7 @@ static void __inet_del_ifa(struct in_dev
+               struct in_ifaddr **ifap1 = &ifa1->ifa_next;
+ 
+               while ((ifa = *ifap1) != NULL) {
++                      trace_ipv4_addr_del(ifa);
+                       if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
+                           ifa1->ifa_scope <= ifa->ifa_scope)
+                               last_prim = ifa;
+@@ -363,6 +365,7 @@ static int __inet_insert_ifa(struct in_i
+                       }
+                       ifa->ifa_flags |= IFA_F_SECONDARY;
+               }
++              trace_ipv4_addr_add(ifa);
+       }
+ 
+       if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {