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Re: Memory again

From: Stefan Monnier
Subject: Re: Memory again
Date: Sun, 27 Nov 2011 23:27:03 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.91 (gnu/linux)

> Allow me to be naive and ask this: what about compaction?

Lots of work for very little benefit: the memory may not be re-usable by
the OS until Emacs exits, but it *is* reusable by Emacs, so it's largely
a non-problem.

> Would the allocator in use fragment the overall system memory
> space if it frees more aggressively?

We do not care about the "system memory".  It's the OS's job ;-) And no,
Emacs does not "fragment" the system memory (whatever that can mean in
the page-based virtual-memory used by OS es these days) more than other

> Nothing like that happened, but I had to restore some of the files as
> it was from a temporary directory. Restoring the directory made emacs
> realize the "file has changed on disk". Is this checked via a hash/checksum
> or does emacs carry along more than that?

If it says "file has changed on disk" it mean the buffer was
still around.


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