89 lines
2.0 KiB
C++
89 lines
2.0 KiB
C++
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//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose: Inner workings of Performance Monitor Counters on the xbox 360;
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// they let vprof track L2 dcache misses, LHS, etc.
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//
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//=============================================================================//
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#include "pch_tier0.h"
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#ifndef _X360
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#error pmc360.cpp must only be compiled for XBOX360!
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#else
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#include "tier0/platform.h"
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#include "tier0/vprof.h"
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#include <pmcpbsetup.h>
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#include "tier0/dbg.h"
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#include "pmc360.h"
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#include "tier0/memdbgon.h"
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static bool s_bInitialized = false;
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CPMCData::CPMCData()
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{
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}
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void CPMCData::InitializeOnceProgramWide( void )
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{
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#if !defined( _CERT )
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// Select a set of sixteen counters
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DmPMCInstallAndStart( PMC_SETUP_FLUSHREASONS_PB0T0 );
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// Reset the Performance Monitor Counters in preparation for a new sampling run.
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DmPMCResetCounters();
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#endif
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s_bInitialized = true;
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}
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bool CPMCData::IsInitialized()
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{
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return s_bInitialized;
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}
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void CPMCData::Start()
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{
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#if !defined( _CERT )
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// stop the stopwatches, save off the counter, start them again.
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DmPMCStop();
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PMCState pmcstate;
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// Get the counters.
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DmPMCGetCounters( &pmcstate );
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// in the default state as set up by InitializeOnceProgramWide,
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// counters 9 and 6 are L2 misses and LHS respectively
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m_OnStart.L2CacheMiss = pmcstate.pmc[9];
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m_OnStart.LHS = pmcstate.pmc[6];
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DmPMCStart();
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#endif
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}
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void CPMCData::End()
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{
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#if !defined( _CERT )
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DmPMCStop();
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// get end-state counters
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PMCState pmcstate;
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// Get the counters.
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DmPMCGetCounters( &pmcstate );
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// in the default state as set up by InitializeOnceProgramWide,
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// counters 9 and 6 are l2 misses and LHS respectively
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const uint64 &endL2 = pmcstate.pmc[9];
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const uint64 &endLHS = pmcstate.pmc[6];
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// compute delta between end and start. Because these are
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// unsigned nums, even in overflow this still works out
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// correctly under modular arithmetic.
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m_Delta.L2CacheMiss = endL2 - m_OnStart.L2CacheMiss;
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m_Delta.LHS = endLHS - m_OnStart.LHS;
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DmPMCStart();
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#endif
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}
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#endif
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