src/patches/suse-2.6.27.25/patches.trace/lttng-instrumentation-ipv6.patch

   1 From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
   2 Subject: LTTng instrumentation - ipv6
   3
   4 Original patch header:
   5   LTTng instrumentation - ipv6
   6
   7   Instrument addr_add and del of network interfaces. Lets a tracer know the
   8   interface address changes.
   9
  10   Those tracepoints are used by LTTng.
  11
  12   About the performance impact of tracepoints (which is comparable to markers),
  13   even without immediate values optimizations, tests done by Hideo Aoki on ia64
  14   show no regression. His test case was using hackbench on a kernel where
  15   scheduler instrumentation (about 5 events in code scheduler code) was added.
  16   See the "Tracepoints" patch header for performance result detail.
  17
  18   Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
  19   CC: Pekka Savola <pekkas@netcore.fi>
  20   CC: netdev@vger.kernel.org
  21   CC: David S. Miller <davem@davemloft.net>
  22   CC: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
  23   CC: Masami Hiramatsu <mhiramat@redhat.com>
  24   CC: 'Peter Zijlstra' <peterz@infradead.org>
  25   CC: "Frank Ch. Eigler" <fche@redhat.com>
  26   CC: 'Ingo Molnar' <mingo@elte.hu>
  27   CC: 'Hideo AOKI' <haoki@redhat.com>
  28   CC: Takashi Nishiie <t-nishiie@np.css.fujitsu.com>
  29   CC: 'Steven Rostedt' <rostedt@goodmis.org>
  30   CC: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
  31
  32 Acked-by: Jan Blunck <jblunck@suse.de>
  33 ---
  34 ---
  35  include/trace/ipv6.h |   14 ++++++++++++++
  36  net/ipv6/addrconf.c  |    4 ++++
  37  2 files changed, 18 insertions(+)
  38
  39 --- /dev/null
  40 +++ b/include/trace/ipv6.h
  41 @@ -0,0 +1,14 @@
  42 +#ifndef _TRACE_IPV6_H
  43 +#define _TRACE_IPV6_H
  44 +
  45 +#include <net/if_inet6.h>
  46 +#include <linux/tracepoint.h>
  47 +
  48 +DEFINE_TRACE(ipv6_addr_add,
  49 +       TPPROTO(struct inet6_ifaddr *ifa),
  50 +       TPARGS(ifa));
  51 +DEFINE_TRACE(ipv6_addr_del,
  52 +       TPPROTO(struct inet6_ifaddr *ifa),
  53 +       TPARGS(ifa));
  54 +
  55 +#endif
  56 --- a/net/ipv6/addrconf.c
  57 +++ b/net/ipv6/addrconf.c
  58 @@ -85,6 +85,7 @@
  59
  60  #include <linux/proc_fs.h>
  61  #include <linux/seq_file.h>
  62 +#include <trace/ipv6.h>
  63
  64  /* Set to 3 to get tracing... */
  65  #define ACONF_DEBUG 2
  66 @@ -653,6 +654,8 @@ ipv6_add_addr(struct inet6_dev *idev, co
  67         /* For caller */
  68         in6_ifa_hold(ifa);
  69
  70 +       trace_ipv6_addr_add(ifa);
  71 +
  72         /* Add to big hash table */
  73         hash = ipv6_addr_hash(addr);
  74
  75 @@ -2167,6 +2170,7 @@ static int inet6_addr_del(struct net *ne
  76                         in6_ifa_hold(ifp);
  77                         read_unlock_bh(&idev->lock);
  78
  79 +                       trace_ipv6_addr_del(ifp);
  80                         ipv6_del_addr(ifp);
  81
  82                         /* If the last address is deleted administratively,