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Re: Change in vc-git ls-files-unknown makes emacs hang

From: Dmitry Gutov
Subject: Re: Change in vc-git ls-files-unknown makes emacs hang
Date: Fri, 20 Dec 2019 16:13:59 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0

On 20.12.2019 12:52, Filipp Gunbin wrote:

Filipp, please produce a backtrace during the freeze, either by using
SIGUSR2, as Stefan suggested, or by attaching a debugger, and post the

Hi, please find the trace in the attach (it's large).

Thank you. It doesn't exactly answer my question about desktop-read (did you really have an old VC-Dir buffer in that saved session?), but it shows one bottleneck. One that is even prominently decorated with an old comment saying "this is VERY inefficient". :-)

Here's a patch you can try. It should help to an extent. And if it's the main bottleneck, we can optimize further, e.g. by eliminating the expand-file-name calls.

But if in the end you should see one very long VC-Dir buffer, which can be a usability problem on its own.

Attachment: vc-dir-update-faster.diff
Description: Text Data

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