src/mem/CommMonitor.py

   1 # Copyright (c) 2012 ARM Limited
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  35 #
  36 # Authors: Thomas Grass
  37 #          Andreas Hansson
  38
  39 from m5.params import *
  40 from MemObject import MemObject
  41
  42 # The communication monitor will most typically be used in combination
  43 # with periodic dumping and resetting of stats using schedStatEvent
  44 class CommMonitor(MemObject):
  45     type = 'CommMonitor'
  46
  47     # one port in each direction
  48     master = MasterPort("Master port")
  49     slave = SlavePort("Slave port")
  50
  51     # control the sample period window length of this monitor
  52     sample_period = Param.Clock("1ms", "Sample period for histograms")
  53
  54     # for each histogram, set the number of bins and enable the user
  55     # to disable the measurement, reads and writes use the same
  56     # parameters
  57
  58     # histogram of burst length of packets (not using sample period)
  59     burst_length_bins = Param.Unsigned('20', "# bins in burst length " \
  60                                            "histograms")
  61     disable_burst_length_hists = Param.Bool(False, "Disable burst length " \
  62                                                 "histograms")
  63
  64     # bandwidth per sample period
  65     bandwidth_bins = Param.Unsigned('20', "# bins in bandwidth histograms")
  66     disable_bandwidth_hists = Param.Bool(False, "Disable bandwidth histograms")
  67
  68     # latency from request to response (not using sample period)
  69     latency_bins = Param.Unsigned('20', "# bins in latency histograms")
  70     disable_latency_hists = Param.Bool(False, "Disable latency histograms")
  71
  72     # inter transaction time (ITT) distributions in uniformly sized
  73     # bins up to the maximum, independently for read-to-read,
  74     # write-to-write and the combined request-to-request that does not
  75     # separate read and write requests
  76     itt_bins = Param.Unsigned('20', "# bins in ITT distributions")
  77     itt_max_bin = Param.Latency('100ns', "Max bin of ITT distributions")
  78     disable_itt_dists = Param.Bool(False, "Disable ITT distributions")
  79
  80     # outstanding requests (that did not yet get a response) per
  81     # sample period
  82     outstanding_bins = Param.Unsigned('20', "# bins in outstanding " \
  83                                           "requests histograms")
  84     disable_outstanding_hists = Param.Bool(False, "Disable outstanding " \
  85                                                "requests histograms")
  86
  87     # transactions (requests) observed per sample period
  88     transaction_bins = Param.Unsigned('20', "# bins in transaction " \
  89                                           "count histograms")
  90     disable_transaction_hists = Param.Bool(False, "Disable transaction count " \
  91                                                "histograms")
  92
  93     # address distributions (heatmaps) with associated address masks
  94     # to selectively only look at certain bits of the address
  95     read_addr_mask = Param.Addr(MaxAddr, "Address mask for read address")
  96     write_addr_mask = Param.Addr(MaxAddr, "Address mask for write address")
  97     disable_addr_dists = Param.Bool(True, "Disable address distributions")