zig

commit b1bcdc96ca4451be95caa00fe71aafb578611e34 (tree)
parent 8c10178a1e209af53d28cc70343d0ce908bccc1b
Author: Andrew Kelley <andrew@ziglang.org>
Date:   Wed, 20 May 2020 15:57:02 -0400

arena allocator: smaller minimum allocation size

Diffstat:
M
lib/std/heap/arena_allocator.zig
 | 
8
++------

1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/lib/std/heap/arena_allocator.zig b/lib/std/heap/arena_allocator.zig
@@ -47,12 +47,8 @@ pub const ArenaAllocator = struct {
 
     fn createNode(self: *ArenaAllocator, prev_len: usize, minimum_size: usize) !*BufNode {
         const actual_min_size = minimum_size + @sizeOf(BufNode);
-        var len = prev_len;
-        while (true) {
-            len += len / 2;
-            len += mem.page_size - @rem(len, mem.page_size);
-            if (len >= actual_min_size) break;
-        }
+        const big_enough_len = prev_len + actual_min_size;
+        const len = big_enough_len + big_enough_len / 2;
         const buf = try self.child_allocator.alignedAlloc(u8, @alignOf(BufNode), len);
         const buf_node_slice = mem.bytesAsSlice(BufNode, buf[0..@sizeOf(BufNode)]);
         const buf_node = &buf_node_slice[0];