mm: memory pressure support returns the maximum available memory

Signed-off-by: yinshengkai <yinshengkai@xiaomi.com>

mm/umm_heap/umm_calloc.c

@@ -78,7 +78,8 @@ FAR void *calloc(size_t n, size_t elem_size)
     }
   else
     {
-      mm_notify_pressure(mm_heapfree(USR_HEAP));
+      mm_notify_pressure(mm_heapfree(USR_HEAP),
+                         mm_heapfree_largest(USR_HEAP));
     }
 
   return mem;

mm/umm_heap/umm_malloc.c

@@ -68,7 +68,8 @@ FAR void *malloc(size_t size)
     }
   else
     {
-      mm_notify_pressure(mm_heapfree(USR_HEAP));
+      mm_notify_pressure(mm_heapfree(USR_HEAP),
+                         mm_heapfree_largest(USR_HEAP));
     }
 
   return ret;

mm/umm_heap/umm_memalign.c

@@ -95,7 +95,8 @@ FAR void *memalign(size_t alignment, size_t size)
     }
   else
     {
-      mm_notify_pressure(mm_heapfree(USR_HEAP));
+      mm_notify_pressure(mm_heapfree(USR_HEAP),
+                         mm_heapfree_largest(USR_HEAP));
     }
 
   return ret;

mm/umm_heap/umm_realloc.c

@@ -97,7 +97,8 @@ FAR void *realloc(FAR void *oldmem, size_t size)
     }
   else
     {
-      mm_notify_pressure(mm_heapfree(USR_HEAP));
+      mm_notify_pressure(mm_heapfree(USR_HEAP),
+                         mm_heapfree_largest(USR_HEAP));
     }
 
   return ret;

mm/umm_heap/umm_zalloc.c

@@ -74,7 +74,8 @@ FAR void *zalloc(size_t size)
     }
   else
     {
-      mm_notify_pressure(mm_heapfree(USR_HEAP));
+      mm_notify_pressure(mm_heapfree(USR_HEAP),
+                         mm_heapfree_largest(USR_HEAP));
     }
 
   return ret;