perf tools: Add attr->mmap2 support

This patch adds support for the new PERF_RECORD_MMAP2 record type
exposed by the kernel. This is an extended PERF_RECORD_MMAP record.

It adds for each file-backed mapping the device major, minor number and
the inode number and generation.

This triplet uniquely identifies the source of a file-backed mapping. It
can be used to detect identical virtual mappings between processes, for
instance.

The patch will prefer MMAP2 over MMAP.

Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1377079825-19057-3-git-send-email-eranian@google.com
[ Cope with 314add6 "Change machine__findnew_thread() to set thread pid",
  fix 'perf test' regression test entry affected,
  use perf_missing_features.mmap2 to fallback to not using .mmap2 in older kernels,
  so that new tools can work with kernels where this feature is not present ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 24 insertions, 1 deletions

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 0308d9ee7a77..51f5edf2a6d0 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -351,6 +351,25 @@ static void perf_event__mmap_swap(union perf_event *event,
         }
 }
 
+static void perf_event__mmap2_swap(union perf_event *event,
+                                  bool sample_id_all)
+{
+        event->mmap2.pid   = bswap_32(event->mmap2.pid);
+        event->mmap2.tid   = bswap_32(event->mmap2.tid);
+        event->mmap2.start = bswap_64(event->mmap2.start);
+        event->mmap2.len   = bswap_64(event->mmap2.len);
+        event->mmap2.pgoff = bswap_64(event->mmap2.pgoff);
+        event->mmap2.maj   = bswap_32(event->mmap2.maj);
+        event->mmap2.min   = bswap_32(event->mmap2.min);
+        event->mmap2.ino   = bswap_64(event->mmap2.ino);
+
+        if (sample_id_all) {
+                void *data = &event->mmap2.filename;
+
+                data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
+                swap_sample_id_all(event, data);
+        }
+}
 static void perf_event__task_swap(union perf_event *event, bool sample_id_all)
 {
         event->fork.pid  = bswap_32(event->fork.pid);
@@ -455,6 +474,7 @@ typedef void (*perf_event__swap_op)(union perf_event *event,
 
 static perf_event__swap_op perf_event__swap_ops[] = {
         [PERF_RECORD_MMAP]                = perf_event__mmap_swap,
+        [PERF_RECORD_MMAP2]               = perf_event__mmap2_swap,
         [PERF_RECORD_COMM]                = perf_event__comm_swap,
         [PERF_RECORD_FORK]                = perf_event__task_swap,
         [PERF_RECORD_EXIT]                = perf_event__task_swap,
@@ -851,7 +871,8 @@ static struct machine *
              (cpumode == PERF_RECORD_MISC_GUEST_USER))) {
                 u32 pid;
 
-                if (event->header.type == PERF_RECORD_MMAP)
+                if (event->header.type == PERF_RECORD_MMAP
+                    || event->header.type == PERF_RECORD_MMAP2)
                         pid = event->mmap.pid;
                 else
                         pid = sample->pid;
@@ -978,6 +999,8 @@ static int perf_session_deliver_event(struct perf_session *session,
                                                     sample, evsel, machine);
         case PERF_RECORD_MMAP:
                 return tool->mmap(tool, event, sample, machine);
+        case PERF_RECORD_MMAP2:
+                return tool->mmap2(tool, event, sample, machine);
         case PERF_RECORD_COMM:
                 return tool->comm(tool, event, sample, machine);
         case PERF_RECORD_FORK: