release large buffer

dubbogo · Oct 19, 2021 · 5a2ff6a · 5a2ff6a
1 parent 7828a36
commit 5a2ff6a
Showing 1 changed file with 7 additions and 5 deletions.
diff --git a/bytes/buffer.go b/bytes/buffer.go
@@ -149,11 +149,13 @@ func (b *Buffer) grow(n int) int {
  }
  c := cap(b.buf)
  if n <= c/2-m {
- // We can slide things down instead of allocating a new
- // slice. We only need m+n <= c to slide, but
- // we instead let capacity get twice as large so we
- // don't spend all our time copying.
- copy(b.buf, b.buf[b.off:])
+ // decrease buffer space
+ bufLen := len(b.buf[b.off:]) + n
+ if bufLen < smallBufferSize {
+ bufLen = smallBufferSize
+ }
+ newBuf := make([]byte, 0, bufLen)
+ b.buf = append(newBuf, b.buf[b.off:]...)
  } else if c > maxInt-c-n {
  panic(ErrTooLarge)
  } else {