kernel: vm: Add alloc and avl stats

Signed-off-by: Ian Moffett <ian@osmora.org>

2 files changed, 8 insertions, 0 deletions

diff --git a/sys/include/vm/physseg.h b/sys/include/vm/physseg.h
index af8cae8..956f82f 100644
--- a/sys/include/vm/physseg.h
+++ b/sys/include/vm/physseg.h
@@ -35,6 +35,8 @@
 struct physmem_stat {
     size_t reserved_kib;     /* Reserved memory */
     size_t total_kib;        /* Total memory */
+    size_t avl_kib;          /* Available memory */
+    size_t alloc_kib;        /* Allocated physical memory */
 };
 
 void vm_physseg_init(void);
diff --git a/sys/vm/vm_physseg.c b/sys/vm/vm_physseg.c
index 6b803c2..88560e5 100644
--- a/sys/vm/vm_physseg.c
+++ b/sys/vm/vm_physseg.c
@@ -70,6 +70,7 @@ static bitmap_t bitmap = NULL;
 static size_t pages_total = 0;
 static size_t pages_reserved = 0;
 static size_t last_used_idx = 0;
+static size_t pages_allocated = 0;
 static size_t bitmap_size = 0;
 static size_t highest_frame_idx;
 static size_t bitmap_free_start;    /* Beginning bit of free region */
@@ -220,6 +221,7 @@ vm_alloc_pageframe(size_t count)
             for (size_t i = tmp; i < last_used_idx; ++i)
                 bitmap_set_bit(bitmap, i);
 
+            pages_allocated += count;
             return tmp * vm_get_page_size();
         } else {
             pages = 0;
@@ -243,6 +245,8 @@ vm_free_pageframe(uintptr_t base, size_t count)
     for (uintptr_t p = base; p < base + (count*PAGE_SIZE); p += PAGE_SIZE) {
         bitmap_unset_bit(bitmap, p/0x1000);
     }
+
+    pages_allocated -= count;
 }
 
 void
@@ -262,5 +266,7 @@ vm_phys_memstat(void)
     vm_physseg_getstat();
     stat.total_kib = (pages_total * pagesize) / 1024;
     stat.reserved_kib = (pages_reserved * pagesize) / 1024;
+    stat.alloc_kib = (pages_allocated * pagesize) / 1024;
+    stat.avl_kib = stat.total_kib - stat.alloc_kib;
     return stat;
 }