perf: Add PERF_RECORD_NAMESPACES to include namespaces related info
authorHari Bathini <hbathini@linux.vnet.ibm.com>
Tue, 7 Mar 2017 20:41:36 +0000 (02:11 +0530)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Mon, 13 Mar 2017 18:57:41 +0000 (15:57 -0300)
commite422267322cd319e2695a535e47c5b1feeac45eb
treed12374e72bae370972c4ee38db01ca1de844ae01
parent3ef5b4023c64c16c793a066a7a2ed6ea3767e0d7
perf: Add PERF_RECORD_NAMESPACES to include namespaces related info

With the advert of container technologies like docker, that depend on
namespaces for isolation, there is a need for tracing support for
namespaces. This patch introduces new PERF_RECORD_NAMESPACES event for
recording namespaces related info. By recording info for every
namespace, it is left to userspace to take a call on the definition of a
container and trace containers by updating perf tool accordingly.

Each namespace has a combination of device and inode numbers. Though
every namespace has the same device number currently, that may change in
future to avoid the need for a namespace of namespaces. Considering such
possibility, record both device and inode numbers separately for each
namespace.

Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Aravinda Prasad <aravinda@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Sargun Dhillon <sargun@sargun.me>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/148891929686.25309.2827618988917007768.stgit@hbathini.in.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
include/linux/perf_event.h
include/uapi/linux/perf_event.h
kernel/events/core.c
kernel/fork.c
kernel/nsproxy.c