Kernel: Allocate kernel stacks for threads using the region allocator.

This patch moves away from using kmalloc memory for thread kernel stacks.
This reduces pressure on kmalloc (16 KB per thread adds up fast) and
prevents kernel stack overflow from scribbling all over random unrelated
kernel memory.

1 files changed, 5 insertions, 1 deletions

diff --git a/Kernel/VM/VMObject.cpp b/Kernel/VM/VMObject.cpp
index 6a772776b7..a06935257a 100644
--- a/Kernel/VM/VMObject.cpp
+++ b/Kernel/VM/VMObject.cpp
@@ -80,7 +80,11 @@ void VMObject::for_each_region(Callback callback)
 {
     // FIXME: Figure out a better data structure so we don't have to walk every single region every time an inode changes.
     //        Perhaps VMObject could have a Vector<Region*> with all of his mappers?
-    for (auto* region : MM.m_regions) {
+    for (auto* region : MM.m_user_regions) {
+        if (&region->vmo() == this)
+            callback(*region);
+    }
+    for (auto* region : MM.m_kernel_regions) {
         if (&region->vmo() == this)
             callback(*region);
     }