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/*
* Copyright (c) 2015 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Andreas Sandberg
*/
#include "mem/probes/stack_dist.hh"
#include "params/StackDistProbe.hh"
#include "sim/system.hh"
StackDistProbe::StackDistProbe(StackDistProbeParams *p)
: BaseMemProbe(p),
lineSize(p->line_size),
disableLinearHists(p->disable_linear_hists),
disableLogHists(p->disable_log_hists),
calc(p->verify)
{
fatal_if(p->system->cacheLineSize() > p->line_size,
"The stack distance probe must use a cache line size that is "
"larger or equal to the system's cahce line size.");
}
void
StackDistProbe::regStats()
{
BaseMemProbe::regStats();
const StackDistProbeParams *p(
dynamic_cast<const StackDistProbeParams *>(params()));
assert(p);
using namespace Stats;
readLinearHist
.init(p->linear_hist_bins)
.name(name() + ".readLinearHist")
.desc("Reads linear distribution")
.flags(disableLinearHists ? nozero : pdf);
readLogHist
.init(p->log_hist_bins)
.name(name() + ".readLogHist")
.desc("Reads logarithmic distribution")
.flags(disableLogHists ? nozero : pdf);
writeLinearHist
.init(p->linear_hist_bins)
.name(name() + ".writeLinearHist")
.desc("Writes linear distribution")
.flags(disableLinearHists ? nozero : pdf);
writeLogHist
.init(p->log_hist_bins)
.name(name() + ".writeLogHist")
.desc("Writes logarithmic distribution")
.flags(disableLogHists ? nozero : pdf);
infiniteSD
.name(name() + ".infinity")
.desc("Number of requests with infinite stack distance")
.flags(nozero);
}
void
StackDistProbe::handleRequest(const ProbePoints::PacketInfo &pkt_info)
{
// only capturing read and write requests (which allocate in the
// cache)
if (!pkt_info.cmd.isRead() && !pkt_info.cmd.isWrite())
return;
// Align the address to a cache line size
const Addr aligned_addr(roundDown(pkt_info.addr, lineSize));
// Calculate the stack distance
const uint64_t sd(calc.calcStackDistAndUpdate(aligned_addr).first);
if (sd == StackDistCalc::Infinity) {
infiniteSD++;
return;
}
// Sample the stack distance of the address in linear bins
if (!disableLinearHists) {
if (pkt_info.cmd.isRead())
readLinearHist.sample(sd);
else
writeLinearHist.sample(sd);
}
if (!disableLogHists) {
int sd_lg2 = sd == 0 ? 1 : floorLog2(sd);
// Sample the stack distance of the address in log bins
if (pkt_info.cmd.isRead())
readLogHist.sample(sd_lg2);
else
writeLogHist.sample(sd_lg2);
}
}
StackDistProbe *
StackDistProbeParams::create()
{
return new StackDistProbe(this);
}
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