Messages in this thread Patch in this message |  | | From | Stephane Eranian <> | Subject | [PATCH v4 15/18] perf: add PERF_RECORD_MISC_MMAP_DATA to RECORD_MMAP | Date | Thu, 20 Dec 2012 16:41:45 +0100 |
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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> --- 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 b2a78bb..0fa3feb 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -446,6 +446,7 @@ 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 3366f89..3a19a45 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -4764,6 +4764,9 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event) 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(); -- 1.7.9.5
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