Question

基于以下链接：MSDN Docu

我正在尝试获取当前正在使用的页面文件的大小。

以下是我获取价值的方式：

ActualPageFileSize = ullAvailPageFile - ullTotalPageFile
AvailablePageFileSize = ullAvailPageFile - ullAvailPhys
UsedPageFile = ActualPageFileSize - AvailablePageFileSize

以上计算基于另一篇文章： Another post

我现在遇到的问题是，有时AvailablePageFileSize的值大于ActualPageFileSize的值，因此返回UsedPageFile的负值。

有没有人遇到过这个？任何想法都将不胜感激。

提前谢谢！

P.S。

示例代码：

#define DIV 1024

void _tmain()
{
  MEMORYSTATUSEX statex;

  statex.dwLength = sizeof (statex);

  GlobalMemoryStatusEx (&statex);

    double committedBytes = 1;

    _tprintf (TEXT("==================================================\n"));
    _tprintf (TEXT("GlobalMemoryStatusEx\n"));
    _tprintf (TEXT("==================================================\n"));
    _tprintf (TEXT("           %PhysUsed : %ld\n"), statex.dwMemoryLoad);
    _tprintf (TEXT("        ullTotalPhys : %I64d (%I64d MB)\n"), statex.ullTotalPhys, statex.ullTotalPhys / (DIV*DIV));
    _tprintf (TEXT("        ullAvailPhys : %I64d (%I64d MB)\n"), statex.ullAvailPhys, statex.ullAvailPhys / (DIV*DIV));
    _tprintf (TEXT("         ullUsedPhys : %I64d (%I64d MB)\n"), statex.ullTotalPhys - statex.ullAvailPhys, (statex.ullTotalPhys - statex.ullAvailPhys) / (DIV*DIV));
    _tprintf (TEXT("                       --------------------------\n"));
    _tprintf (TEXT("   Phys Avail + Used = %I64d (%I64d MB)\n"), statex.ullAvailPhys + (statex.ullTotalPhys - statex.ullAvailPhys), (statex.ullAvailPhys + (statex.ullTotalPhys - statex.ullAvailPhys)) / (DIV*DIV));

    _tprintf (TEXT("==================================================\n"));
    _tprintf (TEXT("    ullTotalPageFile : %I64d (%I64d MB)\n"), statex.ullTotalPageFile, statex.ullTotalPageFile / (DIV*DIV));
    _tprintf (TEXT("    ullAvailPageFile : %I64d (%I64d MB)\n"), statex.ullAvailPageFile, statex.ullAvailPageFile / (DIV*DIV));
    _tprintf (TEXT("     ullUsedPageFile : %I64d (%I64d MB)\n"), statex.ullTotalPageFile - statex.ullAvailPageFile, (statex.ullTotalPageFile - statex.ullAvailPageFile) / (DIV*DIV));
    _tprintf (TEXT("                       --------------------------\n"));
    _tprintf (TEXT("   Page Avail + Used = %I64d (%I64d MB)\n"), statex.ullAvailPageFile + (statex.ullTotalPageFile - statex.ullAvailPageFile), (statex.ullAvailPageFile + (statex.ullTotalPageFile - statex.ullAvailPageFile)) / (DIV*DIV));

    _tprintf (TEXT("==================================================\n"));
    _tprintf (TEXT(" ActualTotalPageFile : %I64d (%I64d MB)\n"), statex.ullTotalPageFile - statex.ullTotalPhys, (statex.ullTotalPageFile - statex.ullTotalPhys) / (DIV*DIV));
    _tprintf (TEXT(" ActualAvailPageFile : %I64d (%I64d MB)\n"), statex.ullAvailPageFile - statex.ullAvailPhys, (statex.ullAvailPageFile - statex.ullAvailPhys) / (DIV*DIV));
    _tprintf (TEXT("  ActualPageFileUsed : %I64d (%I64d MB)\n"), (statex.ullTotalPageFile - statex.ullTotalPhys) - (statex.ullAvailPageFile - statex.ullAvailPhys), ((statex.ullTotalPageFile - statex.ullTotalPhys) - (statex.ullAvailPageFile - statex.ullAvailPhys)) / (DIV*DIV));
    _tprintf (TEXT("            Variance : %I64d (%I64d MB)\n"), (statex.ullAvailPageFile - statex.ullAvailPhys) - (statex.ullTotalPageFile - statex.ullTotalPhys), ((statex.ullAvailPageFile - statex.ullAvailPhys) - (statex.ullTotalPageFile - statex.ullTotalPhys)) / (DIV*DIV));
    _tprintf (TEXT("                       --------------------------\n"));
    _tprintf (TEXT("ActPage Avail + Used = %I64d (%I64d MB)\n"), (statex.ullAvailPageFile - statex.ullAvailPhys) + ((statex.ullTotalPageFile - statex.ullTotalPhys) - (statex.ullAvailPageFile - statex.ullAvailPhys)), ((statex.ullAvailPageFile - statex.ullAvailPhys) + ((statex.ullTotalPageFile - statex.ullTotalPhys) - (statex.ullAvailPageFile - statex.ullAvailPhys))) / (DIV*DIV));
    _tprintf (TEXT("==================================================\n"));
    _tprintf (TEXT("     ullTotalVirtual : %I64d (%I64d MB)\n"), statex.ullTotalVirtual, statex.ullTotalVirtual / (DIV*DIV));
    _tprintf (TEXT("     ullAvailVirtual : %I64d (%I64d MB)\n"), statex.ullAvailVirtual, statex.ullAvailVirtual / (DIV*DIV));
    _tprintf (TEXT(" ullAvailVirtualUsed : %I64d (%I64d MB)\n"), statex.ullTotalVirtual - statex.ullAvailVirtual, (statex.ullTotalVirtual - statex.ullAvailVirtual) / (DIV*DIV));


    PERFORMACE_INFORMATION perfInfo;
    int ret;

    ret = GetPerformanceInfo (&perfInfo,sizeof(perfInfo));

    _tprintf (TEXT("==================================================\n"));
    _tprintf (TEXT("GetPerformanceInfo\n"));
    _tprintf (TEXT("==================================================\n"));

    _tprintf (TEXT("       PageSize : %d (%d MB) \n"), perfInfo.PageSize, perfInfo.PageSize / DIV);
    _tprintf (TEXT("    CommitTotal : %d (%d MB) X %d = %I64d (%I64d MB)\n"), perfInfo.CommitTotal, perfInfo.CommitTotal / DIV, perfInfo.PageSize, (DWORDLONG)perfInfo.CommitTotal * perfInfo.PageSize, (DWORDLONG)(perfInfo.CommitTotal * perfInfo.PageSize)  / (DIV*DIV));
    _tprintf (TEXT("    CommitLimit : %d (%d MB) X %d = %I64d (%I64d MB)\n"), perfInfo.CommitLimit, perfInfo.CommitLimit / DIV, perfInfo.PageSize, (DWORDLONG)perfInfo.CommitLimit * perfInfo.PageSize, (DWORDLONG)(perfInfo.CommitLimit * perfInfo.PageSize) / (DIV*DIV));
    _tprintf (TEXT("    CommitAvail : %d (%d MB) X %d = %I64d (%I64d MB)\n"), perfInfo.CommitLimit - perfInfo.CommitTotal, (perfInfo.CommitLimit - perfInfo.CommitTotal) / DIV, perfInfo.PageSize, (DWORDLONG)(perfInfo.CommitLimit - perfInfo.CommitTotal) * perfInfo.PageSize, (DWORDLONG)((perfInfo.CommitLimit - perfInfo.CommitTotal) * perfInfo.PageSize) / (DIV*DIV));
    _tprintf (TEXT("  PhysicalTotal : %d (%d MB) X %d = %I64d (%I64d MB)\n"), perfInfo.PhysicalTotal, perfInfo.PhysicalTotal / DIV, perfInfo.PageSize, (DWORDLONG)perfInfo.PhysicalTotal * perfInfo.PageSize, (DWORDLONG)(perfInfo.PhysicalTotal * perfInfo.PageSize) / (DIV*DIV));
    _tprintf (TEXT("  PhysicalAvail : %d (%d MB) X %d = %I64d (%I64d MB)\n"), perfInfo.PhysicalAvailable, perfInfo.PhysicalAvailable / DIV, perfInfo.PageSize, (DWORDLONG)(perfInfo.PhysicalAvailable * perfInfo.PageSize), (DWORDLONG)(perfInfo.PhysicalAvailable * perfInfo.PageSize) / (DIV*DIV));

    DWORDLONG ptotal = (DWORDLONG)(perfInfo.CommitLimit - perfInfo.PhysicalTotal) * perfInfo.PageSize;
    DWORDLONG pavail = (DWORDLONG)((perfInfo.CommitLimit - perfInfo.CommitTotal) - perfInfo.PhysicalAvailable) * perfInfo.PageSize;
    _tprintf (TEXT("\nCommitLimit - PhysicalTotal = %I64d (%I64d MB) \n"), ptotal, (DWORDLONG)ptotal / (DIV*DIV));
    _tprintf (TEXT("CommitAvail - PhysicalAvail = %I64d (%I64d MB) \n"), pavail, (DWORDLONG)pavail / (DIV*DIV));
    _tprintf (TEXT("CommitUsed  - %I64d (%I64d MB) \n"), (DWORDLONG)(ptotal - pavail), (DWORDLONG)(ptotal - pavail) / (DIV*DIV));
}

示例良好输出：

R:\>memtest.exe
==================================================
GlobalMemoryStatusEx
==================================================
           PhysUsed : 24
        ullTotalPhys : 4294430720 (4095 MB)
        ullAvailPhys : 3231776768 (3082 MB)
         ullUsedPhys : 1062653952 (1013 MB)
                       --------------------------
   Phys Avail + Used = 4294430720 (4095 MB)
==================================================
    ullTotalPageFile : 5032628224 (4799 MB)
    ullAvailPageFile : 3932905472 (3750 MB)
     ullUsedPageFile : 1099722752 (1048 MB)
                       --------------------------
   Page Avail + Used = 5032628224 (4799 MB)
==================================================
 ActualTotalPageFile : 738197504 (704 MB)
 ActualAvailPageFile : 701128704 (668 MB)
  ActualPageFileUsed : 37068800 (35 MB)
            Variance : -37068800 (17592186044380 MB)
                       --------------------------
ActPage Avail + Used = 738197504 (704 MB)
==================================================
     ullTotalVirtual : 2147352576 (2047 MB)
     ullAvailVirtual : 2072608768 (1976 MB)
 ullAvailVirtualUsed : 74743808 (71 MB)
==================================================
GetPerformanceInfo
==================================================
       PageSize : 4096 (4 MB)
    CommitTotal : 268487 (262 MB) X 4096 = 1099722752 (1048 MB)
    CommitLimit : 1228669 (1199 MB) X 4096 = 5032628224 (703 MB)
    CommitAvail : 960182 (937 MB) X 4096 = 3932905472 (3750 MB)
  PhysicalTotal : 1048445 (1023 MB) X 4096 = 4294430720 (4095 MB)
  PhysicalAvail : 789000 (770 MB) X 4096 = 3231744000 (3082 MB)

CommitLimit - PhysicalTotal = 738197504 (704 MB)
CommitAvail - PhysicalAvail = 701161472 (668 MB)
CommitUsed  - 37036032 (35 MB)

R:\>

示例错误输出：

U:\>memtest.exe
==================================================
GlobalMemoryStatusEx
==================================================
           PhysUsed : 35
        ullTotalPhys : 3220688896 (3071 MB)
        ullAvailPhys : 2087751680 (1991 MB) <--- Should be less than ullAvailPageFile
         ullUsedPhys : 1132937216 (1080 MB)
                       --------------------------
   Phys Avail + Used = 3220688896 (3071 MB)
==================================================
    ullTotalPageFile : 3757559808 (3583 MB)
    ullAvailPageFile : 1925316608 (1836 MB) <-- Shouldbe greater than ullAvailPhys
     ullUsedPageFile : 1832243200 (1747 MB)
                       --------------------------
   Page Avail + Used = 3757559808 (3583 MB)
==================================================
 ActualTotalPageFile : 536870912 (512 MB)
 ActualAvailPageFile : -162435072 (17592186044261 MB) <-- This is ullAvailPageFile - ullAvailPhys
  ActualPageFileUsed : 699305984 (666 MB)
            Variance : -699305984 (17592186043749 MB)
                       --------------------------
ActPage Avail + Used = 536870912 (512 MB)
==================================================
     ullTotalVirtual : 2147352576 (2047 MB)
     ullAvailVirtual : 2139230208 (2040 MB)
 ullAvailVirtualUsed : 8122368 (7 MB)
==================================================
GetPerformanceInfo
==================================================
       PageSize : 4096 (4 MB)
    CommitTotal : 447325 (436 MB) X 4096 = 1832243200 (1747 MB)
    CommitLimit : 917373 (895 MB) X 4096 = 3757559808 (3583 MB)
    CommitAvail : 470048 (459 MB) X 4096 = 1925316608 (1836 MB)
  PhysicalTotal : 786301 (767 MB) X 4096 = 3220688896 (3071 MB)
  PhysicalAvail : 509698 (497 MB) X 4096 = 2087723008 (1991 MB)

CommitLimit - PhysicalTotal = 536870912 (512 MB)
CommitAvail - PhysicalAvail = 17592023638016 (16777061 MB)
CommitUsed  - -17591486767104 (17592169267866 MB)

U:\>

Answer 1

下一个代码的工作原理是从win2000到最新的win10 x64。关于弃用，未记录等：

NtQuerySystemInformation将来可能会被更改或不可用 Windows版本。

我已经读了15年了。 ntdll api将来/将被删除 - 我的个人选择是否定的。决不。这是基础原生api和基于此的所有所谓的win32 api。但这只是我的选择。如何最小化这对所有现有的Windows版本都很好。原样（我肯定会在新版本中使用）

typedef struct SYSTEM_PAGEFILE_INFORMATION
{
    ULONG NextEntryOffset;
    ULONG TotalSize;
    ULONG TotalInUse;
    ULONG PeakUsage;
    UNICODE_STRING PageFileName;
} *PSYSTEM_PAGEFILE_INFORMATION;

NTSTATUS GetPageFilesInfo()
{
    static volatile UCHAR guz;
    PVOID stack = alloca(guz);
    ULONG cb = 0, rcb = 2*sizeof(SYSTEM_PAGEFILE_INFORMATION) + 64* sizeof(WCHAR);

    union {
        PVOID buf;
        PSYSTEM_PAGEFILE_INFORMATION pspfi;
        PBYTE pb;
    };
    NTSTATUS status;
    do 
    {
        if (cb < rcb)
        {
            cb = RtlPointerToOffset(buf = alloca(rcb - cb), stack);
        }

        if (0 <= (status = NtQuerySystemInformation(SystemPageFileInformation, buf, cb, &rcb)))
        {
            ULONG NextEntryOffset = 0;
            do 
            {
                pb += NextEntryOffset;

                DbgPrint("%ukb %ukb %ukb %wZ\n", pspfi->TotalInUse, pspfi->PeakUsage, pspfi->TotalSize, &pspfi->PageFileName);

            } while (NextEntryOffset = pspfi->NextEntryOffset);

            break;
        }

    } while (status == STATUS_INFO_LENGTH_MISMATCH);

    return status;
}

如果ZwQuerySystemInformation

打开页面，那就很有趣了

[ZwQuerySystemInformation 不再可用于 Windows 8 。而是使用此中列出的备用功能主题。]

但这是直接谎言 - ZwQuerySystemInformation可用，在win 8中，赢得8.1，赢得10 ..并且在用户模式 Zw和Nt函数 - 这是别名 - 它始终指向到同一地址（这是具有2个名字的单一功能）

GlobalMemoryStatusEx / GetPerformanceInfo - 获取实际页面文件大小，使用的页面文件和可用页面文件

1 个答案: