[reactos] 01/02: [NTOS:CC] Be verbose about why we defer writes

[Jérôme Gardou]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=edd4a985d986158e8d02c…

commit edd4a985d986158e8d02c42a4bd340f4b30686ed
Author:     Jérôme Gardou <jerome.gardou(a)reactos.org>
AuthorDate: Tue Feb 16 11:26:25 2021 +0100
Commit:     Jérôme Gardou <jerome.gardou(a)reactos.org>
CommitDate: Wed Mar 24 15:27:36 2021 +0100

    [NTOS:CC] Be verbose about why we defer writes
---
 ntoskrnl/cc/copy.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/ntoskrnl/cc/copy.c b/ntoskrnl/cc/copy.c
index 3ab5b7852f3..30864bc319e 100644
--- a/ntoskrnl/cc/copy.c
+++ b/ntoskrnl/cc/copy.c
@@ -418,7 +418,18 @@ CcCanIWrite (
                                     &CcDeferredWriteSpinLock);
     }
 
+#if DBG
     DPRINT1("Actively deferring write for: %p\n", FileObject);
+    DPRINT1("Because:\n");
+    if (CcTotalDirtyPages + Pages >= CcDirtyPageThreshold)
+        DPRINT1("    There are too many cache dirty pages: %x + %x >= %x\n",
CcTotalDirtyPages, Pages, CcDirtyPageThreshold);
+    if (MmAvailablePages <= MmThrottleTop)
+        DPRINT1("    Available pages are below throttle top: %lx <= %lx\n",
MmAvailablePages, MmThrottleTop);
+    if (MmModifiedPageListHead.Total >= 1000)
+        DPRINT1("    There are too many modified pages: %lu >= 1000\n",
MmModifiedPageListHead.Total);
+    if (MmAvailablePages <= MmThrottleBottom)
+        DPRINT1("    Available pages are below throttle bottom: %lx <=
%lx\n", MmAvailablePages, MmThrottleBottom);
+#endif
     /* Now, we'll loop until our event is set. When it is set, it means that caller
      * can immediately write, and has to
      */