[tip:perf/core] perf machine: Add pointer to sample's environment

[tip-bot for Arnaldo Carvalho de Melo]

Commit-ID:  4cde998d205894705b534878122631142a3eefe4
Gitweb:     http://git.kernel.org/tip/4cde998d205894705b534878122631142a3eefe4
Author:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Wed, 9 Sep 2015 12:25:00 -0300
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Mon, 14 Sep 2015 12:50:29 -0300

perf machine: Add pointer to sample's environment

The 'struct machine' represents the machine where the samples were/are
being collected, and we also have a 'struct perf_env' with extra details
about such machine, that we were collecting at 'perf.data' creation time
but we also needed when no perf.data file is being used, such as in
'perf top'.

So, get those structs closer together, as they provide a bigger picture
of the sample's environment.

In 'perf session', when the file argument is NULL, we can assume that
the tool is sampling the running machine, so point machine->env to
the global put in place in previous patches, while set it to the
perf_header.env one when reading from a file.

This paves the way for machine->env to be used in
perf_event__preprocess_sample to populate addr_location.socket.

Tested-by: Wang Nan <wangnan0@xxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-2ajotl0khscutm68exictoy9@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/header.c  | 1 +
 tools/perf/util/machine.c | 1 +
 tools/perf/util/machine.h | 1 +
 tools/perf/util/session.c | 2 ++
 4 files changed, 5 insertions(+)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 46ec6c5..6d8fa54 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2564,6 +2564,7 @@ int perf_session__read_header(struct perf_session *session)
 		return -ENOMEM;
 
 	session->evlist->env = &header->env;
+	session->machines.host.env = &header->env;
 	if (perf_data_file__is_pipe(file))
 		return perf_header__read_pipe(session);
 
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 6309f7c..fd1efea 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -35,6 +35,7 @@ int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
 	machine->last_match = NULL;
 
 	machine->vdso_info = NULL;
+	machine->env = NULL;
 
 	machine->pid = pid;
 
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index ea5cb4a..9dfc428 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -34,6 +34,7 @@ struct machine {
 	struct list_head  dead_threads;
 	struct thread	  *last_match;
 	struct vdso_info  *vdso_info;
+	struct perf_env   *env;
 	struct dsos	  dsos;
 	struct map_groups kmaps;
 	struct map	  *vmlinux_maps[MAP__NR_TYPES];
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 728cb11..d1a43a3 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -138,6 +138,8 @@ struct perf_session *perf_session__new(struct perf_data_file *file,
 			perf_session__set_id_hdr_size(session);
 			perf_session__set_comm_exec(session);
 		}
+	} else  {
+		session->machines.host.env = &perf_env;
 	}
 
 	if (!file || perf_data_file__is_write(file)) {
--
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