perf script python: Improve physical mem type resolution

perf script python: Improve physical mem type resolution

Previously system RAM and persistent memory were hard code matched,
change so that the label of the memory region is just read from
/proc/iomem. This avoids frequent N/A samples.

Change the /proc/iomem reading, event processing and output so that
nested entries appear and their counts count toward their parent. As
labels may be repeated, include the memory ranges in the output to make
it clear why, for example, "System RAM" appears twice.

Before:

  Event: mem_inst_retired.all_loads:P
  Memory type                                    count  percentage
  ----------------------------------------  ----------  ----------
  System RAM                                      9460        96.5%
  N/A                                              998         3.5%

After:

  Event: mem_inst_retired.all_loads:P
  Memory type                                    count  percentage
  ----------------------------------------  ----------  ----------
  100000000-105f7fffff : System RAM              36741        96.5
    841400000-8416599ff : Kernel data               89         0.2
    840800000-8412a6fff : Kernel rodata             60         0.2
    841ebe000-8423fffff : Kernel bss                34         0.1
  0-fff : Reserved                                1345         3.5
  100000-89dd9fff : System RAM                       2         0.0

Before:

  Event: mem_inst_retired.any:P
  Memory type                                    count  percentage
  ----------------------------------------  -----------  -----------
  System RAM                                      9460        90.5%
  N/A                                              998         9.5%

After:

  Event: mem_inst_retired.any:P
  Memory type                                    count  percentage
  ----------------------------------------  ----------  ----------
  100000000-105f7fffff : System RAM               9460        90.5
    841400000-8416599ff : Kernel data               45         0.4
    840800000-8412a6fff : Kernel rodata             19         0.2
    841ebe000-8423fffff : Kernel bss                12         0.1
  0-fff : Reserved                                 998         9.5

The code has been updated to python 3 with type hints and resolving
issues reported by mypy and pylint. Tabs are swapped to spaces as
preferred in PEP8, because most lines of code were modified (of this
small file) and this makes pylint significantly less noisy.

Committer testing:

  root@number:/tmp# grep -m1 "model name" /proc/cpuinfo
  model name    : Intel(R) Core(TM) i7-14700K
  root@number:/tmp#
  root@number:/tmp# perf script mem-phys-addr -a find /
  /bin
  /lib
  /lib64
  /sbin
  Warning:
  744 out of order events recorded.
  Event: cpu_core/mem_inst_retired.all_loads/P
  Memory type                                    count  percentage
  ----------------------------------------  ----------  ----------
  100000000-8bfbfffff : System RAM              364561        76.5
    621400000-6223a6fff : Kernel rodata          10474         2.2
    622400000-62283d4bf : Kernel data             4828         1.0
    623304000-6237fffff : Kernel bss              1063         0.2
    620000000-6213fffff : Kernel code               98         0.0
  0-fff : Reserved                              111480        23.4
  100000-2b0ca017 : System RAM                     337         0.1
  2fbad000-30d92fff : System RAM                    44         0.0
  2c79d000-2fbabfff : System RAM                    30         0.0
  30d94000-316d5fff : System RAM                    16         0.0
  2b131a58-2c71dfff : System RAM                     7         0.0
  root@number:/tmp#

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Kan Liang <kan.liang@linux.intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20241119180130.19160-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>