From: Eli Zaretskii <eliz@gnu.org>
To: Dmitry Antipov <dmantipov@yandex.ru>
Cc: eggert@cs.ucla.edu, monnier@iro.umontreal.ca, emacs-devel@gnu.org
Subject: Re: Aligned blocks management: obsolete?
Date: Thu, 21 Jun 2012 19:29:39 +0300 [thread overview]
Message-ID: <83fw9od3ws.fsf@gnu.org> (raw)
In-Reply-To: <4FE2A2A2.5080904@yandex.ru>
> Date: Thu, 21 Jun 2012 08:27:14 +0400
> From: Dmitry Antipov <dmantipov@yandex.ru>
> CC: monnier@iro.umontreal.ca, eggert@cs.ucla.edu, emacs-devel@gnu.org
>
> > P.S. If memory fragmentation is what you worry about, then doesn't
> > ralloc.c free us from this, on platforms that use it?
>
> I don't know how ralloc.c works.
It hooks into sbrk, and when malloc asks for more memory by calling
sbrk, ralloc.c relocates buffer text trying to free a bug enough
chunk, before it lets the call to sbrk to proceed.
> In general, I believe moving/compacting GC is the only way to reduce
> fragmentation; since current design makes it impossible to
> move/compact Lisp objects, any underlying allocator can't really
> help to reduce fragmentation.
Maybe I don't understand what you mean by move/compact, but aren't
buffer text and data of a Lisp string already designed to support such
moving/compacting? The pointer to the text is obtained by a second
dereference, so the Lisp object representing buffer and string stays
unmodified when the text is relocated.
next prev parent reply other threads:[~2012-06-21 16:29 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-12 8:11 Aligned blocks management: obsolete? Dmitry Antipov
2011-12-12 13:13 ` Eli Zaretskii
2011-12-12 14:07 ` Dmitry Antipov
2011-12-12 18:11 ` Eli Zaretskii
2011-12-12 18:27 ` Paul Eggert
2012-06-19 16:51 ` Dmitry Antipov
2012-06-19 17:13 ` Eli Zaretskii
2012-06-19 21:34 ` Stefan Monnier
2012-06-20 6:47 ` Dmitry Antipov
2012-06-20 12:48 ` Stefan Monnier
2012-06-20 13:54 ` Dmitry Antipov
2012-06-20 15:41 ` Stefan Monnier
2012-06-20 17:10 ` Eli Zaretskii
2012-06-21 4:27 ` Dmitry Antipov
2012-06-21 16:29 ` Eli Zaretskii [this message]
2012-07-04 8:39 ` Old topic(s) again [was: Re: Aligned blocks management: obsolete?] Dmitry Antipov
2012-07-04 13:11 ` Stefan Monnier
2012-06-21 21:34 ` Aligned blocks management: obsolete? Richard Stallman
2012-06-20 17:06 ` Eli Zaretskii
2012-06-21 3:30 ` Dmitry Antipov
2012-06-21 16:23 ` Eli Zaretskii
2012-06-20 17:59 ` Wolfgang Jenkner
2012-06-21 3:12 ` Dmitry Antipov
2012-06-20 6:53 ` Paul Eggert
2011-12-12 18:38 ` Stefan Monnier
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