From: Eli Zaretskii <eliz@gnu.org>
To: "Stephen J. Turnbull" <stephen@xemacs.org>
Cc: nix@esperi.org.uk, ofv@wanadoo.es, monnier@iro.umontreal.ca,
emacs-devel@gnu.org
Subject: Re: [PATCH] Added inotify support.
Date: Mon, 08 Oct 2012 10:06:48 +0200 [thread overview]
Message-ID: <83zk3x4cbr.fsf@gnu.org> (raw)
In-Reply-To: <877gr1e921.fsf@uwakimon.sk.tsukuba.ac.jp>
> From: "Stephen J. Turnbull" <stephen@xemacs.org>
> Date: Mon, 08 Oct 2012 16:07:18 +0900
> Cc: Nix <nix@esperi.org.uk>, Óscar Fuentes <ofv@wanadoo.es>,
> emacs-devel@gnu.org
>
> According to nix, inotify is unreliable, end of discussion.
>
> If so, it may make sense to back up inotify with polling, although at
> a greatly reduced rate. Also, files may get moved across filesystems
> which support different mechanisms, etc, etc. So allowing different
> files to get notifications in different ways, and perhaps even
> changing backends on the fly may be useful/necessary for maximum
> reliability.
If one wants a 100% reliability, polling cannot be done at slower
rates without degrading response times. Some applications might not
like the long response times. And of course, you won't know when the
notifications are less reliable than you would like to, so selectively
increasing the polling rate in those problematic cases seems
impossible.
Moreover, both inotify and the equivalent Windows APIs are documented
to lose notifications on a busy filesystem, so even a perfectly local
file/directory cannot be watched with 100% reliability.
And that is even before we think about the effects of the internal
Emacs mechanisms of handling these events. E.g., if there's a lot of
input from the keyboard and the window system, and if some heavy Lisp
is running, it is quite possible to have the file-notification event
be stuck in limbo for some time, before Emacs examines it and takes
action.
IOW, this will work well "most of the time", but that's about it.
next prev parent reply other threads:[~2012-10-08 8:06 UTC|newest]
Thread overview: 125+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-03 22:34 [PATCH] Support for filesystem watching (inotify) Rüdiger Sonderfeld
2011-06-04 8:52 ` joakim
2011-06-04 16:40 ` Rüdiger Sonderfeld
2011-06-04 10:43 ` Jan Djärv
2011-06-04 23:36 ` [PATCH update2] " Rüdiger Sonderfeld
2011-06-05 5:45 ` Eli Zaretskii
2011-06-05 9:48 ` [PATCH update3] " Rüdiger Sonderfeld
2011-06-05 7:48 ` [PATCH update2] " Jan Djärv
2011-06-05 7:54 ` Andreas Schwab
2011-06-05 9:49 ` Rüdiger Sonderfeld
2011-06-05 15:59 ` John Yates
2011-06-05 16:14 ` Rüdiger Sonderfeld
2011-06-05 16:58 ` Eli Zaretskii
2011-06-06 18:56 ` Rüdiger Sonderfeld
2011-06-06 19:57 ` Eli Zaretskii
2011-06-04 11:30 ` [PATCH] " Eli Zaretskii
2011-06-04 17:13 ` [PATCH updated] " Rüdiger Sonderfeld
2011-06-04 19:15 ` Eli Zaretskii
2011-06-04 20:10 ` Thien-Thi Nguyen
2011-06-04 23:43 ` Rüdiger Sonderfeld
2011-06-05 2:15 ` Thien-Thi Nguyen
2011-06-05 9:22 ` Štěpán Němec
2011-06-15 20:53 ` Johan Bockgård
2011-06-16 8:52 ` Inlined cl functions -- how to learn about them Štěpán Němec
2011-06-06 15:21 ` [PATCH updated] Support for filesystem watching (inotify) Stefan Monnier
2011-06-06 16:25 ` Rüdiger Sonderfeld
2011-06-06 17:11 ` Stefan Monnier
2011-06-06 20:16 ` Ted Zlatanov
2011-06-07 14:42 ` Stefan Monnier
2011-06-07 16:46 ` Ted Zlatanov
2011-06-07 18:06 ` Stefan Monnier
2011-06-07 18:26 ` Ted Zlatanov
2011-06-24 0:50 ` Rüdiger Sonderfeld
2011-06-24 10:19 ` Ted Zlatanov
2011-06-24 12:18 ` Ted Zlatanov
2011-07-06 13:36 ` Stefan Monnier
2011-07-06 15:54 ` Paul Eggert
2011-07-06 18:30 ` Stefan Monnier
2011-07-06 20:39 ` Paul Eggert
2011-07-06 19:14 ` wide-int crash [was Re: [PATCH updated] Support for filesystem watching (inotify)] Glenn Morris
2011-07-06 22:31 ` Paul Eggert
2011-07-07 19:43 ` [PATCH updated] Support for filesystem watching (inotify) Stefan Monnier
2012-09-28 13:06 ` [PATCH] Added basic file system watching support Rüdiger Sonderfeld
2012-09-28 14:13 ` Stefan Monnier
2012-09-28 16:27 ` Rüdiger Sonderfeld
2012-10-01 4:38 ` Stefan Monnier
2012-10-01 7:24 ` Eli Zaretskii
2012-10-01 14:09 ` [PATCH] Added inotify support Rüdiger Sonderfeld
2012-10-01 16:27 ` Stefan Monnier
2012-10-02 21:28 ` Eli Zaretskii
2012-10-02 23:46 ` Óscar Fuentes
2012-10-03 2:10 ` Stefan Monnier
2012-10-03 3:54 ` Eli Zaretskii
2012-10-03 12:46 ` Stefan Monnier
2012-10-03 18:34 ` Eli Zaretskii
2012-10-03 18:47 ` Stefan Monnier
2012-10-03 19:08 ` Eli Zaretskii
2012-10-03 20:59 ` Stefan Monnier
2012-10-12 13:54 ` Eli Zaretskii
2012-10-14 14:55 ` Eli Zaretskii
2012-10-03 19:33 ` Óscar Fuentes
2012-10-05 7:40 ` Eli Zaretskii
2012-10-05 13:07 ` Óscar Fuentes
2012-10-05 15:19 ` Eli Zaretskii
2012-10-05 16:55 ` Nix
2012-10-05 17:15 ` Eli Zaretskii
2012-10-05 17:46 ` Nix
2012-10-05 18:22 ` Stefan Monnier
2012-10-05 18:30 ` Óscar Fuentes
2012-10-06 16:39 ` Nix
2012-10-06 17:01 ` Stefan Monnier
2012-10-06 18:51 ` Nix
2012-10-06 21:26 ` Stefan Monnier
2012-10-06 21:28 ` Nix
2012-10-07 7:38 ` Achim Gratz
2012-10-07 13:58 ` Stefan Monnier
2012-10-07 14:54 ` Achim Gratz
2012-10-07 8:24 ` Stephen J. Turnbull
2012-10-07 14:00 ` Stefan Monnier
2012-10-07 14:28 ` Óscar Fuentes
2012-10-07 14:38 ` Stefan Monnier
2012-10-08 7:07 ` Stephen J. Turnbull
2012-10-08 8:06 ` Eli Zaretskii [this message]
2012-10-14 15:52 ` Jim Meyering
2012-10-06 7:04 ` Stephen J. Turnbull
2012-10-06 7:23 ` Andreas Schwab
2012-10-06 16:41 ` Nix
2012-10-07 8:09 ` Stephen J. Turnbull
2012-10-07 14:08 ` Stefan Monnier
2012-10-03 3:57 ` Eli Zaretskii
2012-12-02 20:08 ` Eli Zaretskii
2012-12-03 17:18 ` Stefan Monnier
2012-12-10 14:16 ` Eli Zaretskii
2012-12-10 14:47 ` Stefan Monnier
2012-12-10 11:52 ` Eli Zaretskii
2012-12-10 12:11 ` Rüdiger Sonderfeld
2012-12-11 7:43 ` Michael Albinus
2012-12-11 8:20 ` Eli Zaretskii
2012-12-11 16:36 ` Michael Albinus
2012-12-11 16:46 ` Rüdiger Sonderfeld
2012-12-11 20:17 ` Michael Albinus
2012-12-11 7:54 ` [PATCH] Added basic file system watching support Michael Albinus
2012-12-11 8:12 ` Eli Zaretskii
2012-12-11 8:19 ` Michael Albinus
2012-12-11 8:29 ` Eli Zaretskii
2012-12-11 8:44 ` Michael Albinus
2012-12-11 9:39 ` Eli Zaretskii
2012-12-11 10:15 ` Eli Zaretskii
2012-12-11 10:38 ` Michael Albinus
2012-12-11 10:24 ` Michael Albinus
2012-12-11 12:51 ` Eli Zaretskii
2012-12-11 13:17 ` Michael Albinus
2012-12-11 13:23 ` Eli Zaretskii
2012-12-12 1:09 ` Leo
2012-12-12 3:57 ` Eli Zaretskii
2013-01-07 11:33 ` Michael Albinus
2013-01-07 15:57 ` Eli Zaretskii
2013-01-07 16:00 ` Michael Albinus
2013-01-07 20:26 ` Stefan Monnier
2013-01-08 7:44 ` Michael Albinus
2011-06-06 15:14 ` [PATCH updated] Support for filesystem watching (inotify) Stefan Monnier
2011-06-06 16:21 ` Rüdiger Sonderfeld
2012-09-18 11:50 ` [PATCH] " Leo
2012-09-26 12:15 ` Rüdiger Sonderfeld
2012-09-26 17:52 ` Stefan Monnier
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