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