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Subject[tip:perf/x86] perf: Add PERF_RECORD_MISC_MMAP_DATA to RECORD_MMAP
Commit-ID:  59e1a00ac0e4d33ffc46814a3509b5cc2c94c56f
Gitweb: http://git.kernel.org/tip/59e1a00ac0e4d33ffc46814a3509b5cc2c94c56f
Author: Stephane Eranian <eranian@google.com>
AuthorDate: Thu, 24 Jan 2013 16:10:39 +0100
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Fri, 25 Jan 2013 10:19:05 +0100

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>
---
include/uapi/linux/perf_event.h | 1 +
kernel/events/core.c | 3 +++
2 files changed, 4 insertions(+)

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 0c46659..62e9f25 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 4661009..dd1c130 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4764,6 +4764,9 @@ 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();

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