Re: HG, git and others actualize the modeline when commit form the command line

[Dmitry Gutov]

On 16.11.2020 21:26, Eli Zaretskii wrote:
> > Cc: emacs-devel@gnu.org
> > From: Dmitry Gutov <dgutov@yandex.ru>
> > Date: Mon, 16 Nov 2020 20:43:54 +0200
> >
> > > You are well advised not to use auto-revert-mode in VCS repositories.
> >
> > Why not?
>
> Because a VCS repository triggers the poorly-scalable behavior of file
> notifications.  We watch directories, and in a repository some
> directories see a lot of file activity unrelated to the files you
> actually visit.

I can see how that can happen (even though it never caused a big enough 
problem for me personally), but AFAIK all modern editors provide some 
sort of counterpart to auto-revert-mode (updating the contents of files 
when they are edited externally). And of course that also works in VCS 
repositories, which is the normal case these days.

So if it's problematic in Emacs, I think it should be on the priority 
list of bugs to fix.

Worst case, we can switch over from filenotify to simple polling in 
those cases.