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pdumper's performance

From: Stefan Monnier
Subject: pdumper's performance
Date: Wed, 29 Aug 2018 16:29:09 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

I was looking at the pdumper and one thing I was wondering is how to use
of all the <foo>_marked_p and set_<foo>_marked functions impacts GC (and
hence) runtime performance.

I mean the fact that they're functions is perfectly fine, but the fact
that they need to test pdumper_object_p might have a measurable impact,
since I believe these operations are performed very many times per GC.

Also I don't quite understand why this is needed: IIUC the markbits of
pdump'd objects are stored elsewhere, but I don't understand why that
needs to be the case.


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