bug#122: 23.0.60; Slowdown in directory scanning over time.

[Chong Yidong]

Len Trigg <lenbok@gmail.com> writes:

> OK, I started a new emacs a couple of days ago under gdb.  I ran the
> lisp snippet scanning /usr/bin and it reported 0 seconds... Today the
> lisp snippet took 7 seconds to run.  Again, I repeated the call and
> took several backtraces.
>
> The calls seem to be in a fairly even balance of mixture of
> Fget_buffer and Fgarbage_collect.  Why creating a list of files in a
> directory should be calling get_buffer is beyond me. list-buffers
> shows about 40 buffers, and when I try switch-to-buffer with a leading
> space, there are about 200 buffers listed (about 170 of which are
> named like *code-conversion-work*<nnn>)

That's very odd: those buffers are used for code conversion, and they
ought to be killed automatically.

Could you check if you have anything unusual in
kill-buffer-query-functions or kill-buffer hook?