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From: Nicolas Goaziou <mail@nicolasgoaziou.fr>
To: Ihor Radchenko <yantar92@gmail.com>
Cc: emacs-orgmode@gnu.org
Subject: Re: [patch suggestion] Mitigating the poor Emacs performance on huge org files: Do not use overlays for PROPERTY and LOGBOOK drawers
Date: Fri, 05 Jun 2020 15:50:30 +0200	[thread overview]
Message-ID: <87ftb9pqop.fsf@nicolasgoaziou.fr> (raw)
In-Reply-To: <87mu5iq618.fsf@localhost> (Ihor Radchenko's message of "Fri, 05 Jun 2020 16:18:59 +0800")

Ihor Radchenko <yantar92@gmail.com> writes:

>> See also `gensym'. Do we really need to use it for something else than
>> `invisible'? If not, the tool doesn't need to be generic.
>
> For now, I also use it for buffer-local 'invisible stack. The stack is
> needed to preserve folding state of drawers/blocks inside folded
> outline. Though I am thinking about replacing the stack with separate
> text properties, like 'invisible-outline-buffer-local +
> 'invisible-drawer-buffer-local + 'invisible-block-buffer-local.
> Maintaining stack takes a noticeable percentage of CPU time in profiler.
>
> org--get-buffer-local-text-property-symbol must take care about
> situation with indirect buffers. When an indirect buffer is created from
> some org buffer, the old value of char-property-alias-alist is carried
> over. We need to detect this case and create new buffer-local symbol,
> which is unique to the newly created buffer (but not create it if the
> buffer-local property is already there). Then, the new symbol must
> replace the old alias in char-property-alias-alist + old folding state
> must be preserved (via copying the old invisibility specs into the new
> buffer-local text property). I do not see how gensym can benefit this
> logic.

`gensym' is just a shorter, and somewhat standard way, to create a new
uninterned symbol with a given prefix. You seem to re-invent it. What
you do with that new symbol is orthogonal to that suggestion, of course.

>> OK, but this may not be sufficient if we want to do slightly better than
>> overlays in that area. This is not mandatory, though.
>
> Could you elaborate on what can be "slightly better"? 

IIRC, I gave examples of finer control of folding state after a change.
Consider this _folded_ drawer:

  :BEGIN:
  Foo
  :END:

Inserting ":END" in it should not unfold it, as it is currently the case
with overlays,

  :BEGIN
  Foo
  :END
  :END:

but a soon as the last ":" is inserted, the initial drawer could be
expanded.

  :BEGIN
  Foo
  :END:
  :END:

The latter case is not currently handled by overlays. This is what
I call "slightly better".

Also, note that this change is not related to opening and closing lines
of the initial drawer, so sticking text properties on them would not
help here.

Another case is modifying those borders, e.g.,


  :BEGIN:               :BEGIN:
  Foo         ------>   Foo  
  :END:                 :ND:

which should expand the drawer. Your implementation catches this, but
I'm pointing out that current implementation with overlays does not.
Even though that's not strictly required for compatibility with
overlays, it is a welcome slight improvement.

>> As discussed before, I don't think you need to use `modification-hooks'
>> or `insert-behind-hooks' if you already use `after-change-functions'.
>>
>> `after-change-functions' are also triggered upon text properties
>> changes. So, what is the use case for the other hooks?
>
> The problem is that `after-change-functions' cannot be a text property.
> Only `modification-hooks' and `insert-in-front/behind-hooks' can be a
> valid text property. If we use `after-change-functions', they will
> always be triggered, regardless if the change was made inside or outside
> folded region.

As discussed, text properties are local to the change, but require extra
care when moving text around. You also observed serious overhead when
using them.

OTOH, even if `a-c-f' is not local, you can quickly determine if the
change altered a folded element, so the overhead is limited, i.e.,
mostly checking for a text property at a given buffer position.

To be clear, I initially thought that text properties were a superior
choice, but I changed my mind a while ago, and I thought you had, too.
IOW, `after-change-functions' is the way to go, since you have no strong
reason to stick to text properties for this kind of function.

>>> :asd:
>>> :drawer:
>>> lksjdfksdfjl
>>> sdfsdfsdf
>>> :end:
>>>
>>> If :asd: was inserted in front of folded :drawer:, changes in :drawer:
>>> line of the new folded :asd: drawer would reveal the text between
>>> :drawer: and :end:.
>>>
>>> Let me know what you think on this.
>
>> I have first to understand the use case for `modification-hook'. But
>> I think unfolding is the right thing to do in this situation, isn't it?
>
> That situation arises because the modification-hooks from ":drawer:"
> (they are set via text properties) only have information about the
> :drawer:...:end: drawer before the modifications (they were set when
> :drawer: was folded last time). So, they will only unfold a part of the
> new :asd: drawer. I do not see a simple way to unfold everything without
> re-parsing the drawer around the changed text.

Oh! I misread your message. I withdraw what I wrote. In this case, we
don't want to unfold anything. The situation is not worse than what we
have now, and trying to fix it would have repercussions down in the
buffer, e.g., expanding drawers screen below.

As a rule of thumb, I think we can pay attention to changes in the
folded text, and its immediate surroundings (e.g., the opening line,
which is not folded), but no further.

As written above, slight changes are welcome, but let's not go overboard
and parse a whole section just to know if we can expand a drawer.

> Actually, I am quite unhappy with the performance of modification-hooks
> set via text properties (I am using this patch on my Emacs during this
> week). It appears that setting the text properties costs a significant
> CPU time in practice, even though running the hooks is pretty fast.
> I will think about a way to handle modifications using global
> after-change-functions.

That's better, IMO.

I gave you a few ideas to quickly check if a change requires expansion,
in an earlier mail. I suggest to start out from that. Let me know if you
have questions about it.


  reply	other threads:[~2020-06-05 13:51 UTC|newest]

Thread overview: 187+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-24  6:55 Ihor Radchenko
2020-04-24  8:02 ` Nicolas Goaziou
2020-04-25  0:29   ` stardiviner
2020-04-26 16:04   ` Ihor Radchenko
2020-05-04 16:56     ` Karl Voit
2020-05-07  7:18       ` Karl Voit
2020-05-09 15:43       ` Ihor Radchenko
2020-05-07 11:04     ` Christian Heinrich
2020-05-09 15:46       ` Ihor Radchenko
2020-05-08 16:38     ` Nicolas Goaziou
2020-05-09 13:58       ` Nicolas Goaziou
2020-05-09 16:22         ` Ihor Radchenko
2020-05-09 17:21           ` Nicolas Goaziou
2020-05-10  5:25             ` Ihor Radchenko
2020-05-10  9:47               ` Nicolas Goaziou
2020-05-10 13:29                 ` Ihor Radchenko
2020-05-10 14:46                   ` Nicolas Goaziou
2020-05-10 16:21                     ` Ihor Radchenko
2020-05-10 16:38                       ` Nicolas Goaziou
2020-05-10 17:08                         ` Ihor Radchenko
2020-05-10 19:38                           ` Nicolas Goaziou
2020-05-09 15:40       ` Ihor Radchenko
2020-05-09 16:30         ` Ihor Radchenko
2020-05-09 17:32           ` Nicolas Goaziou
2020-05-09 18:06             ` Ihor Radchenko
2020-05-10 14:59               ` Nicolas Goaziou
2020-05-10 15:15                 ` Kyle Meyer
2020-05-10 16:30                 ` Ihor Radchenko
2020-05-10 19:32                   ` Nicolas Goaziou
2020-05-12 10:03                     ` Nicolas Goaziou
2020-05-17 15:00                     ` Ihor Radchenko
2020-05-17 15:40                       ` Ihor Radchenko
2020-05-18 14:35                         ` Nicolas Goaziou
2020-05-18 16:52                           ` Ihor Radchenko
2020-05-19 13:07                             ` Nicolas Goaziou
2020-05-23 13:52                               ` Ihor Radchenko
2020-05-23 13:53                                 ` Ihor Radchenko
2020-05-23 15:26                                   ` Ihor Radchenko
2020-05-26  8:33                                 ` Nicolas Goaziou
2020-06-02  9:21                                   ` Ihor Radchenko
2020-06-02  9:23                                     ` Ihor Radchenko
2020-06-02 12:10                                       ` Bastien
2020-06-02 13:12                                         ` Ihor Radchenko
2020-06-02 13:23                                           ` Bastien
2020-06-02 13:30                                             ` Ihor Radchenko
2020-06-02  9:25                                     ` Ihor Radchenko
2020-06-05  7:26                                     ` Nicolas Goaziou
2020-06-05  8:18                                       ` Ihor Radchenko
2020-06-05 13:50                                         ` Nicolas Goaziou [this message]
2020-06-08  5:05                                           ` Ihor Radchenko
2020-06-08  5:06                                             ` Ihor Radchenko
2020-06-08  5:08                                             ` Ihor Radchenko
2020-06-10 17:14                                             ` Nicolas Goaziou
2020-06-21  9:52                                               ` Ihor Radchenko
2020-06-21 15:01                                                 ` Nicolas Goaziou
2020-08-11  6:45                                               ` Ihor Radchenko
2020-08-11 23:07                                                 ` Kyle Meyer
2020-08-12  6:29                                                   ` Ihor Radchenko
2020-09-20  5:53                                                     ` Ihor Radchenko
2020-09-20 11:45                                                       ` Kévin Le Gouguec
2020-09-22  9:05                                                         ` Ihor Radchenko
2020-09-22 10:00                                                           ` Ihor Radchenko
2020-09-23  6:16                                                             ` Kévin Le Gouguec
2020-09-23  6:48                                                               ` Ihor Radchenko
2020-09-23  7:09                                                                 ` Bastien
2020-09-23  7:30                                                                   ` Ihor Radchenko
2020-09-24 18:07                                                                 ` Kévin Le Gouguec
2020-09-25  2:16                                                                   ` Ihor Radchenko
2020-12-15 17:38                                                                     ` [9.4] Fixing logbook visibility during isearch Kévin Le Gouguec
2020-12-16  3:15                                                                       ` Ihor Radchenko
2020-12-16 18:05                                                                         ` Kévin Le Gouguec
2020-12-17  3:18                                                                           ` Ihor Radchenko
2020-12-17 14:50                                                                             ` Kévin Le Gouguec
2020-12-18  2:23                                                                               ` Ihor Radchenko
2020-12-24 23:37                                                                                 ` Kévin Le Gouguec
2020-12-25  2:51                                                                                   ` Ihor Radchenko
2020-12-25 10:59                                                                                     ` Kévin Le Gouguec
2020-12-25 12:32                                                                                       ` Ihor Radchenko
2020-12-25 21:35                                                                                     ` Kévin Le Gouguec
2020-12-26  4:14                                                                                       ` Ihor Radchenko
2020-12-26 11:44                                                                                         ` Kévin Le Gouguec
2020-12-26 12:22                                                                                           ` Ihor Radchenko
2020-12-04  5:58                                                       ` [patch suggestion] Mitigating the poor Emacs performance on huge org files: Do not use overlays for PROPERTY and LOGBOOK drawers Ihor Radchenko
2021-03-21  9:09                                                         ` Ihor Radchenko
2021-05-03 17:28                                                           ` Bastien
2021-09-21 13:32                                                             ` Timothy
2021-10-26 17:25                                                               ` Matt Price
2021-10-27  6:27                                                                 ` Ihor Radchenko
2022-01-29 11:37                                                             ` [PATCH 00/35] Merge org-fold feature branch Ihor Radchenko
2022-01-29 11:37                                                               ` [PATCH 01/35] Add org-fold-core: new folding engine Ihor Radchenko
2022-01-29 11:37                                                               ` [PATCH 02/35] Separate folding functions from org.el into new library: org-fold Ihor Radchenko
2022-01-29 11:37                                                               ` [PATCH 03/35] Separate cycling functions from org.el into new library: org-cycle Ihor Radchenko
2022-01-29 11:37                                                               ` [PATCH 04/35] Remove functions from org.el that are now moved elsewhere Ihor Radchenko
2022-01-29 11:37                                                               ` [PATCH 05/35] Disable native-comp in agenda Ihor Radchenko
2022-01-29 11:37                                                               ` [PATCH 06/35] org-macs: New function org-find-text-property-region Ihor Radchenko
2022-01-29 11:37                                                               ` [PATCH 07/35] org-at-heading-p: Accept optional argument Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 08/35] org-string-width: Reimplement to work with new folding Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 09/35] Rename old function call to use org-fold Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 10/35] Implement link folding Ihor Radchenko
2022-05-04  6:13                                                                 ` [BUG] 67275f4 broke evil-search " Tom Gillespie
2022-05-04  6:38                                                                   ` Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 11/35] Implement overlay- and text-property-based versions of some functions Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 12/35] org-fold: Handle indirect buffer visibility Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 13/35] Fix subtle differences between overlays and invisible text properties Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 14/35] Support extra org-fold optimisations for huge buffers Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 15/35] Alias new org-fold functions to their old shorter names Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 16/35] Obsolete old function names that are now in org-fold Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 17/35] org-compat: Work around some third-party packages using outline-* functions Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 18/35] Move `org-buffer-list' to org-macs.el Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 19/35] Restore old visibility behaviour of org-refile Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 20/35] Add org-fold-related tests Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 21/35] org-manual: Update to new org-fold function names Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 22/35] ORG-NEWS: Add list of changes Ihor Radchenko
2022-01-29 20:31                                                                 ` New folding backend & outline (was: [PATCH 22/35] ORG-NEWS: Add list of changes) Kévin Le Gouguec
2022-01-30  2:15                                                                   ` Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 23/35] Backport contributed commits Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 24/35] Fix typo: delete-duplicates → delete-dups Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 25/35] Fix bug in org-get-heading Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 26/35] Rename remaining org-force-cycle-archived → org-cycle-force-archived Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 27/35] Fix org-fold--hide-drawers--overlays Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 28/35] org-string-width: Handle undefined behaviour in older Emacs Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 29/35] org-string-width: Work around `window-pixel-width' bug in old Emacs Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 30/35] org-fold-show-set-visibility: Fix edge case when folded region is at BOB Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 31/35] org-fold-core: Fix fontification inside folded regions Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 32/35] test-org/string-width: Add tests for strings with prefix properties Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 33/35] org--string-from-props: Fix handling folds in Emacs <28 Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 34/35] org-link-make-string: Throw error when both LINK and DESCRIPTION are empty Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 35/35] test-ol/org-toggle-link-display: Fix compatibility with old Emacs Ihor Radchenko
2022-02-03  6:27                                                               ` [PATCH 00/35] Merge org-fold feature branch Bastien
2022-02-03  7:07                                                                 ` Ihor Radchenko
2022-04-20 13:23                                                                   ` [PATCH v2 00/38] Final call for comments: " Ihor Radchenko
2022-04-20 13:23                                                                     ` [PATCH v2 01/38] Add org-fold-core: new folding engine--- Ihor Radchenko
2022-04-20 13:24                                                                     ` [PATCH v2 02/38] Separate folding functions from org.el into new library: org-fold Ihor Radchenko
2022-04-20 13:24                                                                     ` [PATCH v2 03/38] Separate cycling functions from org.el into new library: org-cycle Ihor Radchenko
2022-04-20 13:24                                                                     ` [PATCH v2 04/38] Remove functions from org.el that are now moved elsewhere Ihor Radchenko
2022-04-20 13:24                                                                     ` [PATCH v2 05/38] Disable native-comp in agendaIt caused cryptic bugs in the past Ihor Radchenko
2022-04-20 13:24                                                                     ` [PATCH v2 06/38] org-macs: New function org-find-text-property-region--- Ihor Radchenko
2022-04-20 13:24                                                                     ` [PATCH v2 07/38] org-at-heading-p: Accept optional argument* lisp/org.el (org-at-heading-p): Use second argument to allow Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 08/38] org-string-width: Reimplement to work with new folding Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 09/38] Rename old function call to use org-fold--- Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 10/38] Implement link folding* lisp/ol.el (org-link--link-folding-spec): Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 11/38] Implement overlay- and text-property-based versions of some functions Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 12/38] org-fold: Handle indirect buffer visibility--- Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 13/38] Fix subtle differences between overlays and invisible text properties Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 14/38] Support extra org-fold optimisations for huge buffers Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 15/38] Alias new org-fold functions to their old shorter names Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 16/38] Obsolete old function names that are now in org-fold--- Ihor Radchenko
2022-04-20 13:26                                                                     ` [PATCH v2 17/38] org-compat: Work around some third-party packages using outline-* functions Ihor Radchenko
2022-04-20 13:26                                                                     ` [PATCH v2 18/38] Move `org-buffer-list' to org-macs.el--- Ihor Radchenko
2022-04-20 13:26                                                                     ` [PATCH v2 19/38] Restore old visibility behaviour of org-refile--- Ihor Radchenko
2022-04-20 13:26                                                                     ` [PATCH v2 20/38] Add org-fold-related tests--- Ihor Radchenko
2022-04-20 13:26                                                                     ` [PATCH v2 21/38] org-manual: Update to new org-fold function names--- Ihor Radchenko
2022-04-20 13:26                                                                     ` [PATCH v2 22/38] ORG-NEWS: Add list of changes--- Ihor Radchenko
2022-04-20 13:26                                                                     ` [PATCH v2 23/38] Backport contributed commits--- Ihor Radchenko
2022-04-20 13:26                                                                     ` [PATCH v2 24/38] Fix typo: delete-duplicates → delete-dups Anders Johansson
2022-04-20 13:26                                                                     ` [PATCH v2 25/38] Fix bug in org-get-headingFixes #26, where fontification could make the matching and extraction of heading Anders Johansson
2022-04-20 13:27                                                                     ` [PATCH v2 26/38] Rename remaining org-force-cycle-archived Anders Johansson
2022-04-20 13:27                                                                     ` [PATCH v2 27/38] Fix org-fold--hide-drawers--overlays--- Ihor Radchenko
2022-04-20 13:27                                                                     ` [PATCH v2 28/38] org-string-width: Handle undefined behaviour in older Emacs Ihor Radchenko
2022-04-20 13:27                                                                     ` [PATCH v2 29/38] org-string-width: Work around `window-pixel-width' bug in old Emacs Ihor Radchenko
2022-04-20 13:27                                                                     ` [PATCH v2 30/38] org-fold-show-set-visibility: Fix edge case when folded region is at BOB Ihor Radchenko
2022-04-20 13:28                                                                     ` [PATCH v2 31/38] org-fold-core: Fix fontification inside folded regions Ihor Radchenko
2022-04-20 13:28                                                                     ` [PATCH v2 32/38] test-org/string-width: Add tests for strings with prefix properties Ihor Radchenko
2022-04-20 13:28                                                                     ` [PATCH v2 33/38] org--string-from-props: Fix handling folds in Emacs <28 Ihor Radchenko
2022-04-20 13:28                                                                     ` [PATCH v2 34/38] org-link-make-string: Throw error when both LINK and DESCRIPTION are empty Ihor Radchenko
2022-04-20 13:28                                                                     ` [PATCH v2 35/38] test-ol/org-toggle-link-display: Fix compatibility with old Emacs Ihor Radchenko
2022-04-20 13:28                                                                     ` [PATCH v2 36/38] org-macs.el: Fix fontification checks take 2--- Ihor Radchenko
2022-04-20 13:28                                                                     ` [PATCH v2 37/38] org-fold-core-fontify-region: Fix cases when fontification is not registered Ihor Radchenko
2022-04-20 13:28                                                                     ` [PATCH v2 38/38] org-agenda.el: Re-enable native compilation* lisp/org-agenda.el: Re-enable native compilation as it does not Ihor Radchenko
2022-04-20 14:47                                                                     ` [PATCH v2 00/38] Final call for comments: Merge org-fold feature branch Bastien
2022-04-20 15:38                                                                       ` Ihor Radchenko
2022-04-20 16:22                                                                         ` Bastien
2022-04-21  6:01                                                                           ` Ihor Radchenko
2022-04-21  6:55                                                                             ` Bastien
2022-04-21  9:27                                                                               ` Ihor Radchenko
2022-04-21  9:43                                                                                 ` Bastien
2022-04-22 18:54                                                                     ` Kévin Le Gouguec
2022-04-25 11:44                                                                       ` Ihor Radchenko
2022-04-25 13:02                                                                         ` Bastien
2022-04-25 13:25                                                                           ` Ihor Radchenko
2022-04-25 14:05                                                                             ` Bastien
2022-04-26 11:48                                                                               ` Ihor Radchenko
2022-04-25 11:45                                                                       ` Ihor Radchenko
2022-04-26  6:10                                                                         ` Kévin Le Gouguec
2022-05-03  4:44                                                                     ` [ISSUE] org-fold does not support auto-reveal for some external package commands Christopher M. Miles
     [not found]                                                                     ` <6270b43a.1c69fb81.835d4.54a6SMTPIN_ADDED_BROKEN@mx.google.com>
2022-05-03  6:33                                                                       ` Ihor Radchenko
2022-05-03 10:19                                                                         ` [DONE] " Christopher M. Miles

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