reactos/ntoskrnl/mm/wset.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 1998, 1999, 2000, 2001 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id$
  20  *
  21  * PROJECT:         ReactOS kernel
  22  * FILE:            ntoskrnl/mm/wset.c
  23  * PURPOSE:         Manages working sets
  24  * PROGRAMMER:      David Welch (welch@cwcom.net)
  25  * UPDATE HISTORY:
  26  *                  Created 22/05/98
  27  */
  28
  29 /* INCLUDES *****************************************************************/
  30
  31 #include <ntoskrnl.h>
  32 #define NDEBUG
  33 #include <internal/debug.h>
  34
  35 /* FUNCTIONS *****************************************************************/
  36
  37 NTSTATUS
  38 MmTrimUserMemory(ULONG Target, ULONG Priority, PULONG NrFreedPages)
  39 {
  40    PFN_TYPE CurrentPage;
  41    PFN_TYPE NextPage;
  42    NTSTATUS Status;
  43
  44    (*NrFreedPages) = 0;
  45
  46    CurrentPage = MmGetLRUFirstUserPage();
  47    while (CurrentPage != 0 && Target > 0)
  48    {
  49       NextPage = MmGetLRUNextUserPage(CurrentPage);
  50
  51       Status = MmPageOutPhysicalAddress(CurrentPage);
  52       if (NT_SUCCESS(Status))
  53       {
  54          DPRINT("Succeeded\n");
  55          Target--;
  56          (*NrFreedPages)++;
  57       }
  58       else if (Status == STATUS_PAGEFILE_QUOTA)
  59       {
  60          MmSetLRULastPage(CurrentPage);
  61       }
  62
  63       CurrentPage = NextPage;
  64    }
  65    return(STATUS_SUCCESS);
  66 }
  67
  68 /*
  69  * @unimplemented
  70  */
  71 ULONG
  72 STDCALL
  73 MmTrimAllSystemPagableMemory (
  74         IN ULONG PurgeTransitionList
  75         )
  76 {
  77         UNIMPLEMENTED;
  78         return 0;
  79 }