/*++

Microsoft Confidential
Copyright (c) 1992-1997  Microsoft Corporation
All rights reserved

Module Name:

    perf.c

Abstract:

    Implements the Performance dialog of the System Control Panel Applet

Author:

    Eric Flo (ericflo) 19-Jun-1995

Revision History:

    15-Oct-1997 scotthal
        Complete overhaul
        
    10-Jul-2000 SilviuC
        Added the LargeSystemCache setting.    

--*/
#include <sysdm.h>
#include <help.h>

#define PROCESS_PRIORITY_SEPARATION_MASK    0x00000003
#define PROCESS_PRIORITY_SEPARATION_MAX     0x00000002
#define PROCESS_PRIORITY_SEPARATION_MIN     0x00000000

#define PROCESS_QUANTUM_VARIABLE_MASK       0x0000000c
#define PROCESS_QUANTUM_VARIABLE_DEF        0x00000000
#define PROCESS_QUANTUM_VARIABLE_VALUE      0x00000004
#define PROCESS_QUANTUM_FIXED_VALUE         0x00000008
#define PROCESS_QUANTUM_LONG_MASK           0x00000030
#define PROCESS_QUANTUM_LONG_DEF            0x00000000
#define PROCESS_QUANTUM_LONG_VALUE          0x00000010
#define PROCESS_QUANTUM_SHORT_VALUE         0x00000020

//
// Globals
//

HKEY  m_hKeyPerf = NULL;
TCHAR m_szRegPriKey[] = TEXT( "SYSTEM\\CurrentControlSet\\Control\\PriorityControl" );
TCHAR m_szRegPriority[] = TEXT( "Win32PrioritySeparation" );

HKEY  m_hKeyMemoryManagement = NULL;
TCHAR m_szRegMemoryManagementKey[] = TEXT( "SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Memory Management" );
TCHAR m_szRegLargeSystemCache[] = TEXT( "LargeSystemCache" );


//
// Help ID's
//

// ISSUE: SilviuC: 07/11/2000: IDC_PERF_CACHE_XXX should get help IDs when help is written

DWORD aPerformanceHelpIds[] =
{
    IDC_STATIC,                  NO_HELP,
    IDC_PERF_VM_ALLOCD,          (IDH_PERF + 1),
    IDC_PERF_VM_ALLOCD_LABEL,    (IDH_PERF + 1),
    IDC_PERF_GROUP,              NO_HELP,
    IDC_PERF_TEXT,               (IDH_PERF + 3),
    IDC_PERF_TEXT2,              NO_HELP,
    IDC_PERF_WORKSTATION,        (IDH_PERF + 4),
    IDC_PERF_SERVER,             (IDH_PERF + 5),
    IDC_PERF_VM_GROUP,           NO_HELP,
    IDC_PERF_VM_ALLOCD_TEXT,     NO_HELP,
    IDC_PERF_CHANGE,             (IDH_PERF + 7),
    IDC_PERF_CACHE_GROUP,        NO_HELP,
    IDC_PERF_CACHE_TEXT,         NO_HELP,
    IDC_PERF_CACHE_TEXT2,        NO_HELP,
    IDC_PERF_CACHE_APPLICATION,  (IDH_PERF + 14),
    IDC_PERF_CACHE_SYSTEM,       (IDH_PERF + 15),
    0, 0
};


INT_PTR
APIENTRY 
PerformanceDlgProc(
    IN HWND hDlg, 
    IN UINT uMsg, 
    IN WPARAM wParam, 
    IN LPARAM lParam
)
/*++

Routine Description:

    Handles messages sent to Performance dialog

Arguments:

    hDlg -
        Supplies window handle

    uMsg -
        Supplies message being sent

    wParam -
        Supplies message parameter

    lParam -
        Supplies message parameter

Return Value:

    TRUE if message was handled
    FALSE if message was unhandled

--*/
    {
    static int    iNewChoice = 0;
    LONG   RegRes;
    DWORD  Type, Value, Length;
    DWORD  CacheType;
    DWORD  CacheValue = 0;
    DWORD  CacheLength;
    static int InitPos;
    static int InitRegVal, InitCacheRegVal;
    static int NewRegVal, NewCacheRegVal;
    static BOOL fVMInited = FALSE;
    static BOOL fTempPfWarningShown = FALSE;
    BOOL fTempPf;
    BOOL fWorkstationProduct = !IsOS(OS_ANYSERVER);
    BOOL fAdministrator = IsUserAnAdmin();
    BOOL fVariableQuanta = FALSE;
    BOOL fShortQuanta = FALSE;
    BOOL fFailedToOpenMmKey = FALSE;

    switch (uMsg)
    {
    case WM_INITDIALOG:

        InitPos = 0;
        InitRegVal = 0;
        InitCacheRegVal = 0;

        //
        // initialize from the registry
        //

        RegRes = RegOpenKeyEx( HKEY_LOCAL_MACHINE,
                               m_szRegPriKey,
                               0,
                               fAdministrator ? KEY_QUERY_VALUE | KEY_SET_VALUE : KEY_QUERY_VALUE,
                               &m_hKeyPerf );

        if (RegRes == ERROR_SUCCESS)
        {
            Length = sizeof( Value );
            RegRes = SHRegGetValue(m_hKeyPerf,
                                   NULL,
                                   m_szRegPriority,
                                   SRRF_RT_DWORD,
                                   &Type,
                                   (LPBYTE) &Value,
                                   &Length );

            if (RegRes == ERROR_SUCCESS)
            {
                InitRegVal = Value;
                InitPos = InitRegVal & PROCESS_PRIORITY_SEPARATION_MASK;
                if (InitPos > PROCESS_PRIORITY_SEPARATION_MAX)
                {
                    InitPos = PROCESS_PRIORITY_SEPARATION_MAX;
                }

            }
        }

        if ((RegRes != ERROR_SUCCESS) || (!fAdministrator))
        {
            EnableWindow(GetDlgItem(hDlg, IDC_PERF_WORKSTATION), FALSE);
            EnableWindow(GetDlgItem(hDlg, IDC_PERF_SERVER), FALSE);
        }

        NewRegVal = InitRegVal;

        //
        // determine if we are using fixed or variable quantums
        //
        switch (InitRegVal & PROCESS_QUANTUM_VARIABLE_MASK)
        {
        case PROCESS_QUANTUM_VARIABLE_VALUE:
            fVariableQuanta = TRUE;
            break;

        case PROCESS_QUANTUM_FIXED_VALUE:
            fVariableQuanta = FALSE;
            break;

        case PROCESS_QUANTUM_VARIABLE_DEF:
        default:
            if (fWorkstationProduct)
            {
                fVariableQuanta = TRUE;
            }
            else
            {
                fVariableQuanta = FALSE;
            }
            break;
        }

        //
        // determine if we are using long or short
        //
        switch (InitRegVal & PROCESS_QUANTUM_LONG_MASK)
        {
        case PROCESS_QUANTUM_LONG_VALUE:
            fShortQuanta = FALSE;
            break;

        case PROCESS_QUANTUM_SHORT_VALUE:
            fShortQuanta = TRUE;
            break;

        case PROCESS_QUANTUM_LONG_DEF:
        default:
            if (fWorkstationProduct)
            {
                fShortQuanta = TRUE;
            }
            else
            {
                fShortQuanta = FALSE;
            }
            break;
        }

        //
        // Short, Variable Quanta == Workstation-like interactive response
        // Long, Fixed Quanta == Server-like interactive response
        //
        if (fVariableQuanta && fShortQuanta)
        {
            iNewChoice = PROCESS_PRIORITY_SEPARATION_MAX;

            CheckRadioButton(
                            hDlg,
                            IDC_PERF_WORKSTATION,
                            IDC_PERF_SERVER,
                            IDC_PERF_WORKSTATION
                            );
        } // if
        else
        {
            iNewChoice = PROCESS_PRIORITY_SEPARATION_MIN;

            CheckRadioButton(
                            hDlg,
                            IDC_PERF_WORKSTATION,
                            IDC_PERF_SERVER,
                            IDC_PERF_SERVER
                            );
        } // else


        //
        // Initialize the `memory usage' part.
        //

        fFailedToOpenMmKey = FALSE;

        RegRes = RegOpenKeyEx( HKEY_LOCAL_MACHINE,
                               m_szRegMemoryManagementKey,
                               0,
                               fAdministrator ? KEY_QUERY_VALUE | KEY_SET_VALUE : KEY_QUERY_VALUE,
                               &m_hKeyMemoryManagement );

        if (RegRes == ERROR_SUCCESS)
        {
            CacheValue = 0;
            CacheLength = sizeof( CacheValue );

            RegRes = SHRegGetValue( m_hKeyMemoryManagement,
                                    NULL,
                                    m_szRegLargeSystemCache,
                                    SRRF_RT_DWORD,
                                    &CacheType,
                                    (LPBYTE) &CacheValue,
                                    &CacheLength );

            if (RegRes == ERROR_SUCCESS && CacheValue != 0)
            {
                CheckRadioButton(hDlg,
                                 IDC_PERF_CACHE_APPLICATION,
                                 IDC_PERF_CACHE_SYSTEM,
                                 IDC_PERF_CACHE_SYSTEM);
            }
            else
            {
                CheckRadioButton(hDlg,
                                 IDC_PERF_CACHE_APPLICATION,
                                 IDC_PERF_CACHE_SYSTEM,
                                 IDC_PERF_CACHE_APPLICATION);
            }
        }
        else
        {
            fFailedToOpenMmKey = TRUE;
        }

        if (fFailedToOpenMmKey || (!fAdministrator))
        {
            CheckRadioButton(hDlg,
                             IDC_PERF_CACHE_APPLICATION,
                             IDC_PERF_CACHE_SYSTEM,
                             IDC_PERF_CACHE_APPLICATION);

            EnableWindow(GetDlgItem(hDlg, IDC_PERF_CACHE_APPLICATION), FALSE);
            EnableWindow(GetDlgItem(hDlg, IDC_PERF_CACHE_SYSTEM), FALSE);
        }


        InitCacheRegVal = CacheValue;
        NewCacheRegVal = CacheValue;

        //
        // Init the virtual memory part
        //
        if (VirtualInitStructures())
        {
            fVMInited = TRUE;
            SetDlgItemMB( hDlg, IDC_PERF_VM_ALLOCD, VirtualMemComputeAllocated(hDlg, &fTempPf) );
            //
            // If the system created a temp pagefile, warn the user that
            // the total pagefile size may appear a bit large, but only
            // do so once per System Applet invokation.
            //
            if (fTempPf && !fTempPfWarningShown)
            {
                MsgBoxParam(
                           hDlg,
                           IDS_TEMP_PAGEFILE_WARN,
                           IDS_SYSDM_TITLE,
                           MB_ICONINFORMATION | MB_OK
                           );
                fTempPfWarningShown = TRUE;
            } // if (fTempPf...
        }
        break;

    case WM_DESTROY:
        //
        // If the dialog box is going away, then close the
        // registry key.
        //


        if (m_hKeyPerf)
        {
            RegCloseKey( m_hKeyPerf );
            m_hKeyPerf = NULL;
        }

        if (m_hKeyMemoryManagement)
        {
            RegCloseKey( m_hKeyMemoryManagement );
            m_hKeyMemoryManagement = NULL;
        }

        if (fVMInited)
        {
            VirtualFreeStructures();
        }
        break;


    case WM_NOTIFY:
        switch (((NMHDR *)lParam)->code)
        {
        case PSN_APPLY:
            // 
            // Save new time quantum stuff, if it has changed
            //
            NewRegVal &= ~PROCESS_PRIORITY_SEPARATION_MASK;
            NewRegVal |= iNewChoice;

            if (NewRegVal != InitRegVal)
            {
                Value = NewRegVal;

                if (m_hKeyPerf)
                {
                    Type = REG_DWORD;
                    Length = sizeof( Value );
                    RegSetValueEx( m_hKeyPerf,
                                   m_szRegPriority,
                                   0,
                                   REG_DWORD,
                                   (LPBYTE) &Value,
                                   Length );
                    InitRegVal = Value;

                    //
                    // Kernel monitors this part of the 
                    // registry, so don't tell user he has to reboot
                    //
                }
            }

            //
            // Save `LargeSystemCache' if value changed
            //

            if (InitCacheRegVal != NewCacheRegVal) {

                CacheValue = NewCacheRegVal;

                if (m_hKeyMemoryManagement) {
                    CacheType = REG_DWORD;
                    CacheLength = sizeof( CacheValue );
                    RegSetValueEx( m_hKeyMemoryManagement,
                                   m_szRegLargeSystemCache,
                                   0,
                                   REG_DWORD,
                                   (LPBYTE) &CacheValue,
                                   CacheLength );

                    InitCacheRegVal = CacheValue;

                    //
                    // Request a reboot if things changed
                    //

                    MsgBoxParam(
                               hDlg,
                               IDS_SYSDM_RESTART,
                               IDS_SYSDM_TITLE,
                               MB_OK | MB_ICONINFORMATION
                               );

                    g_fRebootRequired = TRUE;
                }
            }
            break;
        }
        break;

    case WM_COMMAND:
        {
            BOOL fEnableApply = (LOWORD(wParam) != IDC_PERF_CHANGE);

            LRESULT lres;

            switch (LOWORD(wParam))
            {
            case IDC_PERF_CHANGE:
                {
                    lres = DialogBox(
                                    hInstance, 
                                    MAKEINTRESOURCE(DLG_VIRTUALMEM),
                                    hDlg, 
                                    VirtualMemDlg
                                    );

                    if (fVMInited)
                    {
                        SetDlgItemMB(
                                    hDlg, 
                                    IDC_PERF_VM_ALLOCD, 
                                    VirtualMemComputeAllocated(hDlg, NULL) 
                                    );
                    }
                    if (lres != RET_NO_CHANGE)
                    {
                        fEnableApply = TRUE;

                        if (lres != RET_CHANGE_NO_REBOOT)
                        {
                            MsgBoxParam(
                                       hDlg,
                                       IDS_SYSDM_RESTART,
                                       IDS_SYSDM_TITLE,
                                       MB_OK | MB_ICONINFORMATION
                                       );

                            g_fRebootRequired = TRUE;
                        }
                    }
                }
                break;

            case IDC_PERF_WORKSTATION:
                if (BN_CLICKED == HIWORD(wParam))
                {
                    //
                    // Workstations have maximum foreground boost
                    //
                    iNewChoice = PROCESS_PRIORITY_SEPARATION_MAX;

                    //
                    // Workstations have variable, short quanta
                    NewRegVal &= ~PROCESS_QUANTUM_VARIABLE_MASK;
                    NewRegVal |= PROCESS_QUANTUM_VARIABLE_VALUE;
                    NewRegVal &= ~PROCESS_QUANTUM_LONG_MASK;
                    NewRegVal |= PROCESS_QUANTUM_SHORT_VALUE;
                } // if    
                break;

            case IDC_PERF_SERVER:
                if (BN_CLICKED == HIWORD(wParam))
                {
                    //
                    // Servers have minimum foreground boost
                    //
                    iNewChoice = PROCESS_PRIORITY_SEPARATION_MIN;

                    //
                    // Servers have fixed, long quanta
                    //
                    NewRegVal &= ~PROCESS_QUANTUM_VARIABLE_MASK;
                    NewRegVal |= PROCESS_QUANTUM_FIXED_VALUE;
                    NewRegVal &= ~PROCESS_QUANTUM_LONG_MASK;
                    NewRegVal |= PROCESS_QUANTUM_LONG_VALUE;
                } // if
                break;

            case IDC_PERF_CACHE_APPLICATION:
                if (BN_CLICKED == HIWORD(wParam))
                {
                    NewCacheRegVal = 0;
                } // if    
                break;

            case IDC_PERF_CACHE_SYSTEM:
                if (BN_CLICKED == HIWORD(wParam))
                {
                    NewCacheRegVal = 1;
                } // if
                break;
            }

            if (fEnableApply)
            {
                // Enable the "Apply" button because changes have happened.
                SendMessage(GetParent(hDlg), PSM_CHANGED, (WPARAM)hDlg, 0L);
            }
        }
        break;

    case WM_HELP:      // F1
        WinHelp((HWND)((LPHELPINFO) lParam)->hItemHandle, HELP_FILE, HELP_WM_HELP,
                (DWORD_PTR) (LPSTR) aPerformanceHelpIds);
        break;

    case WM_CONTEXTMENU:      // right mouse click
        WinHelp((HWND) wParam, HELP_FILE, HELP_CONTEXTMENU,
                (DWORD_PTR) (LPSTR) aPerformanceHelpIds);
        break;

    default:
        return FALSE;
    }

    return TRUE;
}