perf annotate-data: Add dso->data_types tree

To aggregate accesses to the same data type, add 'data_types' tree in
DSO to maintain data types and find it by name and size.

It might have different data types that happen to have the same name,
so it also compares the size of the type.

Even if it doesn't 100% guarantee, it reduces the possibility of
mis-handling of such conflicts.

And I don't think it's common to have different types with the same
name.

Committer notes:

Very few cases on the Linux kernel, but there are some different types
with the same name, unsure if there is a debug mode in libbpf dedup that
warns about such cases, but there are provisions in pahole for that,
see:

  "emit: Notice type shadowing, i.e. multiple types with the same name (enum, struct, union, etc)"
    https://git.kernel.org/pub/scm/devel/pahole/pahole.git/commit/?id=4f332dbfd02072e4f410db7bdcda8d6e3422974b

  $ pahole --compile > vmlinux.h
  $ rm -f a ; make a
  cc     a.c   -o a
  $ grep __[0-9] vmlinux.h
  union irte__1 {
  struct map_info__1;
  struct map_info__1 {
  	struct map_info__1 *       next;                 /*     0     8 */
  $

  drivers/iommu/amd/amd_iommu_types.h 'union irte'
  include/linux/dmar.h                'struct irte'

  include/linux/device-mapper.h:

    union map_info {
            void *ptr;
    };

  include/linux/mtd/map.h:

    struct map_info {
        const char *name;
        unsigned long size;
        resource_size_t phys;
   <SNIP>

  kernel/events/uprobes.c:

   struct map_info {
        struct map_info *next;
        struct mm_struct *mm;
        unsigned long vaddr;
  };

Signed-off-by: Namhyung Kim <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

0 files changed, 0 insertions, 0 deletions