tools/perf/scripts/python/mem-phys-addr.py

   1 # mem-phys-addr.py: Resolve physical address samples
   2 # SPDX-License-Identifier: GPL-2.0
   3 #
   4 # Copyright (c) 2018, Intel Corporation.
   5
   6 from __future__ import division
   7 import os
   8 import sys
   9 import struct
  10 import re
  11 import bisect
  12 import collections
  13
  14 sys.path.append(os.environ['PERF_EXEC_PATH'] + \
  15         '/scripts/python/Perf-Trace-Util/lib/Perf/Trace')
  16
  17 #physical address ranges for System RAM
  18 system_ram = []
  19 #physical address ranges for Persistent Memory
  20 pmem = []
  21 #file object for proc iomem
  22 f = None
  23 #Count for each type of memory
  24 load_mem_type_cnt = collections.Counter()
  25 #perf event name
  26 event_name = None
  27
  28 def parse_iomem():
  29         global f
  30         f = open('/proc/iomem', 'r')
  31         for i, j in enumerate(f):
  32                 m = re.split('-|:',j,2)
  33                 if m[2].strip() == 'System RAM':
  34                         system_ram.append(long(m[0], 16))
  35                         system_ram.append(long(m[1], 16))
  36                 if m[2].strip() == 'Persistent Memory':
  37                         pmem.append(long(m[0], 16))
  38                         pmem.append(long(m[1], 16))
  39
  40 def print_memory_type():
  41         print "Event: %s" % (event_name)
  42         print "%-40s  %10s  %10s\n" % ("Memory type", "count", "percentage"),
  43         print "%-40s  %10s  %10s\n" % ("----------------------------------------", \
  44                                         "-----------", "-----------"),
  45         total = sum(load_mem_type_cnt.values())
  46         for mem_type, count in sorted(load_mem_type_cnt.most_common(), \
  47                                         key = lambda(k, v): (v, k), reverse = True):
  48                 print "%-40s  %10d  %10.1f%%\n" % (mem_type, count, 100 * count / total),
  49
  50 def trace_begin():
  51         parse_iomem()
  52
  53 def trace_end():
  54         print_memory_type()
  55         f.close()
  56
  57 def is_system_ram(phys_addr):
  58         #/proc/iomem is sorted
  59         position = bisect.bisect(system_ram, phys_addr)
  60         if position % 2 == 0:
  61                 return False
  62         return True
  63
  64 def is_persistent_mem(phys_addr):
  65         position = bisect.bisect(pmem, phys_addr)
  66         if position % 2 == 0:
  67                 return False
  68         return True
  69
  70 def find_memory_type(phys_addr):
  71         if phys_addr == 0:
  72                 return "N/A"
  73         if is_system_ram(phys_addr):
  74                 return "System RAM"
  75
  76         if is_persistent_mem(phys_addr):
  77                 return "Persistent Memory"
  78
  79         #slow path, search all
  80         f.seek(0, 0)
  81         for j in f:
  82                 m = re.split('-|:',j,2)
  83                 if long(m[0], 16) <= phys_addr <= long(m[1], 16):
  84                         return m[2]
  85         return "N/A"
  86
  87 def process_event(param_dict):
  88         name       = param_dict["ev_name"]
  89         sample     = param_dict["sample"]
  90         phys_addr  = sample["phys_addr"]
  91
  92         global event_name
  93         if event_name == None:
  94                 event_name = name
  95         load_mem_type_cnt[find_memory_type(phys_addr)] += 1