src/w32heap.c (realloc_before_dump): Improve commentary.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/w32heap.c b/src/w32heap.c
index cc08dc37219..523df909165 100644
--- a/src/w32heap.c
+++ b/src/w32heap.c
@@ -417,6 +417,12 @@ realloc_before_dump (void *ptr, size_t size)
          malloc_before_dump() and free_before_dump() will take care of
          reallocation.  */
       p = malloc_before_dump (size);
+      /* If SIZE is below MaxBlockSize, malloc_before_dump will try to
+         allocate it in the fixed heap.  If that fails, we could have
+         kept the block in its original place, above bc_limit, instead
+         of failing the call as below.  But this doesn't seem to be
+         worth the added complexity, as loadup allocates only a very
+         small number of large blocks, and never reallocates them.  */
       if (p)
         {
           CopyMemory (p, ptr, size);