perf: Add PERF_RECORD_MISC_MMAP_DATA to RECORD_MMAP

Type of mapping was lost and made it hard for a tool
to distinguish code vs. data mmaps. Perf has the ability
to distinguish the two.

Use a bit in the header->misc bitmask to keep track of
the mmap type. If PERF_RECORD_MISC_MMAP_DATA is set then
the mapping is not executable (!VM_EXEC). If not set, then
the mapping is executable.

Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: peterz@infradead.org
Cc: ak@linux.intel.com
Cc: acme@redhat.com
Cc: jolsa@redhat.com
Cc: namhyung.kim@lge.com
Link: http://lkml.kernel.org/r/1359040242-8269-16-git-send-email-eranian@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 4 insertions, 0 deletions

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 5b5762006855..964a450a6e2c 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -445,6 +445,7 @@ struct perf_event_mmap_page {
 #define PERF_RECORD_MISC_GUEST_KERNEL           (4 << 0)
 #define PERF_RECORD_MISC_GUEST_USER             (5 << 0)
 
+#define PERF_RECORD_MISC_MMAP_DATA              (1 << 13)
 /*
  * Indicates that the content of PERF_SAMPLE_IP points to
  * the actual instruction that triggered the event. See also
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 77c96d18c23a..98c0845fcd20 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4791,6 +4791,9 @@ got_name:
         mmap_event->file_name = name;
         mmap_event->file_size = size;
 
+        if (!(vma->vm_flags & VM_EXEC))
+                mmap_event->event_id.header.misc |= PERF_RECORD_MISC_MMAP_DATA;
+
         mmap_event->event_id.header.size = sizeof(mmap_event->event_id) + size;
 
         rcu_read_lock();