[reactos] 03/06: [NTOS:MM] Do not zero-fill pages when not needed

[Jérôme Gardou]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=708dc6b7d6c2844727902…

commit 708dc6b7d6c28447279025480885e3f608224694
Author:     Jérôme Gardou <jerome.gardou(a)reactos.org>
AuthorDate: Mon Aug 2 17:06:35 2021 +0200
Commit:     Jérôme Gardou <zefklop(a)users.noreply.github.com>
CommitDate: Wed Aug 4 17:48:39 2021 +0200

    [NTOS:MM] Do not zero-fill pages when not needed
---
 ntoskrnl/mm/ARM3/pagfault.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ntoskrnl/mm/ARM3/pagfault.c b/ntoskrnl/mm/ARM3/pagfault.c
index 8d1ce33c399..a5dd04560d3 100644
--- a/ntoskrnl/mm/ARM3/pagfault.c
+++ b/ntoskrnl/mm/ARM3/pagfault.c
@@ -674,6 +674,11 @@ MiResolveDemandZeroFault(IN PVOID Address,
             PageFrameNumber = MiRemoveAnyPage(Color);
             NeedZero = TRUE;
         }
+        else
+        {
+            /* Page guaranteed to be zero-filled */
+            NeedZero = FALSE;
+        }
     }
     else
     {
@@ -688,6 +693,8 @@ MiResolveDemandZeroFault(IN PVOID Address,
         {
             /* System wants a zero page, obtain one */
             PageFrameNumber = MiRemoveZeroPage(Color);
+            /* No need to zero-fill it */
+            NeedZero = FALSE;
         }
     }