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bug#33275: 27.0.50; Image cache pruning

From: Lars Ingebrigtsen
Subject: bug#33275: 27.0.50; Image cache pruning
Date: Fri, 09 Nov 2018 13:22:08 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

(Sorry for the late response; things got in the way as usual...)

Eli Zaretskii <eliz@gnu.org> writes:

>> `image-size' didn't use to cache images, but was introduced as an
>> optimisation.
> And that optimization had a reason, right?

Yeah, the normal use case when you're doing images is that you're going
to end up displaying it.  And `image-size' has to render the image to
see how big it is, so during normal usage, having `image-size' cache the
image is a big win.

Hm...  Perhaps `image-size' should just have a DONT-CACHE optional

> Btw, why doesn't xmalloc return NULL in your case before invoking the
> OOM killer?  Is that expected behavior on GNU/Linux systems?

No, you've got overcommit on Linux, so you often don't get a NULL when
you need it...

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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