bug#53809: 29.0.50; fatal error: assertion failed: string_immovable_p (bytestr)

[Mattias Engdegård]

7 feb. 2022 kl. 19.52 skrev Eli Zaretskii <eliz@gnu.org>:

> Does this mean that Emacs will now be even less willing to return
> memory to the OS, because the bytecode strings cannot be moved by GC?

Not to any significant degree, but it is of course a legitimate concern. 
Bytecode strings are rarely freed at all; they are typically loaded once and 
remain until Emacs terminates. Dynamic bytecode generation and replacement is 
comparatively rare.

Strings are allocated in either of two heaps: one for short strings (≤1024 
bytes) and another for large ones. Only the short string heap is compacted, so 
all the pinning mechanism does is to use the large-string heap for all bytecode 
strings.