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bug#21556: 25.0.50; Memory leak in emacs -Q with lucid (font)
From: |
Dima Kogan |
Subject: |
bug#21556: 25.0.50; Memory leak in emacs -Q with lucid (font) |
Date: |
Fri, 25 Sep 2015 01:13:15 -0700 |
Eli Zaretskii <eliz@gnu.org> writes:
>> From: Dima Kogan <dima@secretsauce.net>
>> Date: Thu, 24 Sep 2015 17:05:12 -0700
>>
>> Main question of this bug report so far:
>>
>> Is there a way to put a watchpoint on a lisp object?
>
> Theoretically, yes.
Hi. I just came back to this, figured out how to (semi-manually) put in
a watchpoint, and this watchpoint told me what's resetting the font
cache: the garbage collector. The backtrace in question:
0x00000000005d2172 in compact_font_cache_entry (entry=24121763) at
alloc.c:5313
#0 0x00000000005d2172 in compact_font_cache_entry (entry=24121763) at
alloc.c:5313
#1 0x00000000005d221b in compact_font_caches () at alloc.c:5339
#2 0x00000000005d2742 in garbage_collect_1 (end=0x7ffcdb166830) at
alloc.c:5515
#3 0x00000000005d2e1d in Fgarbage_collect () at alloc.c:5720
#4 0x000000000054eb21 in maybe_gc () at lisp.h:4515
#5 0x00000000005f638c in Ffuncall (nargs=3, args=0x7ffcdb166988) at
eval.c:2584
Lisp Backtrace:
"Automatic GC" (0x0)
"map-keymap" (0xdb166990)
"keymap-canonicalize" (0xdb166f38)
"x-create-frame" (0xdb1678a0)
"x-create-frame-with-faces" (0xdb167dd8)
0x12b9d80 PVEC_COMPILED
"apply" (0xdb168450)
"frame-creation-function" (0xdb1689f0)
"make-frame" (0xdb168f40)
"make-frame-on-display" (0xdb1694a8)
"server-create-window-system-frame" (0xdb169a78)
"server-process-filter" (0xdb169ff8)
Hardware watchpoint 24: ((struct Lisp_Cons *) 0x1701190)->u.cdr
As a test I asked gdb to never drop fonts in the gc by acting as if
drop==0 in compact_font_cache_entry(), and that made the leak in this
bug go away. Clearly that's not a fix, but it's evidence that the
understanding of the problem is correct, so progress is being made.
- bug#21556: 25.0.50; Memory leak in emacs -Q with lucid (font), Dima Kogan, 2015/09/24
- bug#21556: 25.0.50; Memory leak in emacs -Q with lucid (font), Eli Zaretskii, 2015/09/25
- bug#21556: 25.0.50; Memory leak in emacs -Q with lucid (font), Dima Kogan, 2015/09/25
- bug#21556: 25.0.50; Memory leak in emacs -Q with lucid (font),
Dima Kogan <=
- bug#21556: 25.0.50; Memory leak in emacs -Q with lucid (font), Eli Zaretskii, 2015/09/25
- bug#21556: 25.0.50; Memory leak in emacs -Q with lucid (font), Eli Zaretskii, 2015/09/25
- bug#21556: 25.0.50; Memory leak in emacs -Q with lucid (font), Dima Kogan, 2015/09/25
- bug#21556: 25.0.50; Memory leak in emacs -Q with lucid (font), Eli Zaretskii, 2015/09/25
- bug#21556: 25.0.50; Memory leak in emacs -Q with lucid (font), Eli Zaretskii, 2015/09/25
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