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From: Michael Albinus <michael.albinus@gmx.de>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: 1741@emacsbugs.donarmstrong.com, Dan Nicolaescu <dann@ics.uci.edu>
Subject: bug#1741: 23.0.60; vc fail to register file while logged as /su:: with tramp
Date: Sun, 12 Apr 2009 20:15:23 +0200	[thread overview]
Message-ID: <87myalrb5w.fsf@gmx.de> (raw)
In-Reply-To: <jwvy6u97kqn.fsf-monnier+emacsbugreports@gnu.org> (Stefan Monnier's message of "Thu, 09 Apr 2009 14:23:37 -0400")

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>>> I'd rather find a more generic fix.  E.g. can't you flush the cache when
>>> handling process-file?
>> That would be too invasive, I believe. The whole cache would be flushed,
>> even all data which are not related too.
>
> It should be safe to only flush data related to the relevant host.

That I do already, of course.

>> And there might be the case, that a file is registered in RCS (or
>> whatever backend is used) outside Emacs. Tramp would still have stale
>> cache data for "/su:root@localhost:/tmp/RCS/blah,v" then.
>
> This is unrelated to RCS, and is indeed a real problem.  For that reason
> I'd expect the cache to be flushed very often, yes.  E.g. in
> post-command-hook.  When do you flush it currently?

Currently, I try to avoid flushing data mostly. In fact, flushing
happens file-wise or directory-wise only, when the file or directory
changes. And also in `revert-buffer'.

What I'm thinking about is using a time-stamp for cached data. Then one
could introduce a user option `tramp-cache-ttl', which is set to the
number of seconds a cache entry shall be kept. `nil' means no flush (as
it is today); 0 means no caching at all.

A value of 5 would have already benefit, because usually there are
several calls of, for example, `file-attributes' during a short time,
because of more complex operations.

>         Stefan

Best regards, Michael.






  reply	other threads:[~2009-04-12 18:15 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <200904150011.n3F0BT8Q005193@godzilla.ics.uci.edu>
2008-12-30 10:48 ` bug#1741: 23.0.60; vc fail to register file while logged as /su:: with tramp Thierry Volpiatto
2009-04-07 16:57   ` Dan Nicolaescu
2009-04-08 11:23     ` thierry.volpiatto
2009-04-08 16:24       ` Dan Nicolaescu
2009-04-08 17:53         ` Stefan Monnier
2009-04-09 13:51           ` Michael Albinus
2009-04-09 14:38             ` Stefan Monnier
2009-04-09 15:06               ` Michael Albinus
2009-04-09 18:23                 ` Stefan Monnier
2009-04-12 18:15                   ` Michael Albinus [this message]
2009-04-12 19:41                     ` Stefan Monnier
2009-04-12 19:56                       ` Michael Albinus
2009-04-12 22:51                         ` Stefan Monnier
2009-04-13  9:30                           ` Michael Albinus
2009-04-13 12:24                             ` Stefan Monnier
2009-04-14 15:19                               ` Michael Albinus
2009-04-14 17:06                                 ` Stefan Monnier
2009-04-15 20:55                                   ` Michael Albinus
2009-04-15  0:20   ` bug#1741: marked as done (23.0.60; vc fail to register file while logged as /su:: with tramp) Emacs bug Tracking System

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