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Re: Tooltips GC overhead

From: Paul Eggert
Subject: Re: Tooltips GC overhead
Date: Wed, 29 Jul 2015 14:17:32 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.8.0

martin rudalics wrote:
There are one call of `copy-sequence', two calls of `stringp', three of
`setf', one of `propertize' and one of `selected-frame'.  Together these
would allocate some 20 million bytes?

That's what it's saying, yes.

OTOH the `copy-sequence', `face-attribute' and `alist-get' calls get
nowhere listed.

copy-sequence and propertize are in C. Either can easily allocate millions of bytes.

Perhaps face-attribute doesn't allocate storage; that would explain its not being listed.

alist-get is in a call to the setf macro and you may need to investigate what setf is really doing. One way to look into that is to disassemble the byte code (type "M-x disassemble RET tooltip-show RET") and see what it does.

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