2 * Copyright (c) 2015 ARM Limited
5 * The license below extends only to copyright in the software and shall
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23 * this software without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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37 * Authors: Andreas Sandberg
40 #include "mem/probes/stack_dist.hh"
42 #include "params/StackDistProbe.hh"
43 #include "sim/system.hh"
45 StackDistProbe::StackDistProbe(StackDistProbeParams
*p
)
47 lineSize(p
->line_size
),
48 disableLinearHists(p
->disable_linear_hists
),
49 disableLogHists(p
->disable_log_hists
),
52 fatal_if(p
->system
->cacheLineSize() > p
->line_size
,
53 "The stack distance probe must use a cache line size that is "
54 "larger or equal to the system's cahce line size.");
58 StackDistProbe::regStats()
60 BaseMemProbe::regStats();
62 const StackDistProbeParams
*p(
63 dynamic_cast<const StackDistProbeParams
*>(params()));
66 using namespace Stats
;
69 .init(p
->linear_hist_bins
)
70 .name(name() + ".readLinearHist")
71 .desc("Reads linear distribution")
72 .flags(disableLinearHists
? nozero
: pdf
);
75 .init(p
->log_hist_bins
)
76 .name(name() + ".readLogHist")
77 .desc("Reads logarithmic distribution")
78 .flags(disableLogHists
? nozero
: pdf
);
81 .init(p
->linear_hist_bins
)
82 .name(name() + ".writeLinearHist")
83 .desc("Writes linear distribution")
84 .flags(disableLinearHists
? nozero
: pdf
);
87 .init(p
->log_hist_bins
)
88 .name(name() + ".writeLogHist")
89 .desc("Writes logarithmic distribution")
90 .flags(disableLogHists
? nozero
: pdf
);
93 .name(name() + ".infinity")
94 .desc("Number of requests with infinite stack distance")
99 StackDistProbe::handleRequest(const ProbePoints::PacketInfo
&pkt_info
)
101 // only capturing read and write requests (which allocate in the
103 if (!pkt_info
.cmd
.isRead() && !pkt_info
.cmd
.isWrite())
106 // Align the address to a cache line size
107 const Addr
aligned_addr(roundDown(pkt_info
.addr
, lineSize
));
109 // Calculate the stack distance
110 const uint64_t sd(calc
.calcStackDistAndUpdate(aligned_addr
).first
);
111 if (sd
== StackDistCalc::Infinity
) {
116 // Sample the stack distance of the address in linear bins
117 if (!disableLinearHists
) {
118 if (pkt_info
.cmd
.isRead())
119 readLinearHist
.sample(sd
);
121 writeLinearHist
.sample(sd
);
124 if (!disableLogHists
) {
125 int sd_lg2
= sd
== 0 ? 1 : floorLog2(sd
);
127 // Sample the stack distance of the address in log bins
128 if (pkt_info
.cmd
.isRead())
129 readLogHist
.sample(sd_lg2
);
131 writeLogHist
.sample(sd_lg2
);
137 StackDistProbeParams::create()
139 return new StackDistProbe(this);