[cgutman] 54730: [NTOSKRNL] - Add a wait parameter to CcRosFlushDirtyPages and only block on the segment locks of it is safe

Author: cgutman
Date: Wed Dec 21 19:46:07 2011
New Revision: 54730

URL: http://svn.reactos.org/svn/reactos?rev=54730&view=rev
Log:
[NTOSKRNL]
- Add a wait parameter to CcRosFlushDirtyPages and only block on the segment locks of it is safe

Modified:
    trunk/reactos/ntoskrnl/cc/view.c
    trunk/reactos/ntoskrnl/include/internal/cc.h
    trunk/reactos/ntoskrnl/mm/mminit.c
    trunk/reactos/ntoskrnl/po/power.c

Modified: trunk/reactos/ntoskrnl/cc/view.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/cc/view.c?rev=5473...
==============================================================================
--- trunk/reactos/ntoskrnl/cc/view.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/cc/view.c [iso-8859-1] Wed Dec 21 19:46:07 2011
@@ -175,43 +175,23 @@

NTSTATUS
 NTAPI
-CcRosFlushDirtyPages(ULONG Target, PULONG Count)
+CcRosFlushDirtyPages(ULONG Target, PULONG Count, BOOLEAN Wait)
 {
     PLIST_ENTRY current_entry;
     PCACHE_SEGMENT current;
     ULONG PagesPerSegment;
     BOOLEAN Locked;
     NTSTATUS Status;
-    static ULONG WriteCount[4] = {0, 0, 0, 0};
-    ULONG NewTarget;
+    LARGE_INTEGER ZeroTimeout;

DPRINT("CcRosFlushDirtyPages(Target %d)\n", Target);

(*Count) = 0;
+    ZeroTimeout.QuadPart = 0;

KeEnterCriticalRegion();
     KeAcquireGuardedMutex(&ViewLock);

-    WriteCount[0] = WriteCount[1];
-    WriteCount[1] = WriteCount[2];
-    WriteCount[2] = WriteCount[3];
-    WriteCount[3] = 0;
-    
-    NewTarget = WriteCount[0] + WriteCount[1] + WriteCount[2];
-    
-    if (NewTarget < DirtyPageCount)
-    {
-        NewTarget = (DirtyPageCount - NewTarget + 3) / 4;
-        WriteCount[0] += NewTarget;
-        WriteCount[1] += NewTarget;
-        WriteCount[2] += NewTarget;
-        WriteCount[3] += NewTarget;
-    }
-    
-    NewTarget = WriteCount[0];
-    
-    Target = max(NewTarget, Target);
-    
     current_entry = DirtySegmentListHead.Flink;
     if (current_entry == &DirtySegmentListHead)
     {
@@ -225,17 +205,23 @@
         current_entry = current_entry->Flink;

Locked = current->Bcb->Callbacks->AcquireForLazyWrite(
-            current->Bcb->LazyWriteContext, TRUE);
+            current->Bcb->LazyWriteContext, Wait);
         if (!Locked)
         {
             continue;
         }

-        KeWaitForSingleObject(&current->Mutex,
-                              Executive,
-                              KernelMode,
-                              FALSE,
-                              NULL);
+        Status = KeWaitForSingleObject(&current->Mutex,
+                                       Executive,
+                                       KernelMode,
+                                       FALSE,
+                                       Wait ? NULL : &ZeroTimeout);
+        if (Status != STATUS_SUCCESS)
+        {
+            current->Bcb->Callbacks->ReleaseFromLazyWrite(
+                current->Bcb->LazyWriteContext);
+            continue;
+        }

ASSERT(current->Dirty);
         if (current->ReferenceCount > 1)
@@ -268,11 +254,6 @@

KeAcquireGuardedMutex(&ViewLock);
         current_entry = DirtySegmentListHead.Flink;
-    }
-    
-    if (*Count < NewTarget)
-    {
-        WriteCount[1] += (NewTarget - *Count);
     }

KeReleaseGuardedMutex(&ViewLock);
@@ -374,7 +355,7 @@
     if (Target > 0 && !FlushedPages)
     {
         /* Flush dirty pages to disk */
-        CcRosFlushDirtyPages(Target, &PagesFreed);
+        CcRosFlushDirtyPages(Target, &PagesFreed, FALSE);
         FlushedPages = TRUE;

/* We can only swap as many pages as we flushed */

Modified: trunk/reactos/ntoskrnl/include/internal/cc.h
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/include/internal/c...
==============================================================================
--- trunk/reactos/ntoskrnl/include/internal/cc.h [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/include/internal/cc.h [iso-8859-1] Wed Dec 21 19:46:07 2011
@@ -261,7 +261,8 @@
 NTAPI
 CcRosFlushDirtyPages(
     ULONG Target,
-    PULONG Count
+    PULONG Count,
+    BOOLEAN Wait
 );

VOID

Modified: trunk/reactos/ntoskrnl/mm/mminit.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/mminit.c?rev=54...
==============================================================================
--- trunk/reactos/ntoskrnl/mm/mminit.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/mminit.c [iso-8859-1] Wed Dec 21 19:46:07 2011
@@ -306,7 +306,7 @@
 #ifndef NEWCC
      // XXX arty -- we flush when evicting pages or destorying cache
      // sections.
-      CcRosFlushDirtyPages(128, &PagesWritten);
+      CcRosFlushDirtyPages(128, &PagesWritten, FALSE);
 #endif
    }
 }

Modified: trunk/reactos/ntoskrnl/po/power.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/po/power.c?rev=547...
==============================================================================
--- trunk/reactos/ntoskrnl/po/power.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/po/power.c [iso-8859-1] Wed Dec 21 19:46:07 2011
@@ -902,7 +902,7 @@

#ifndef NEWCC
         /* Flush dirty cache pages */
-        CcRosFlushDirtyPages(-1, &Dummy);
+        CcRosFlushDirtyPages(-1, &Dummy, TRUE);
 #else
         Dummy = 0;
 #endif