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Re: About `purify-flag'

From: Xue Fuqiao
Subject: Re: About `purify-flag'
Date: Wed, 27 Feb 2013 22:23:09 +0800

On Wed, 27 Feb 2013 09:11:08 -0500
Stefan Monnier <address@hidden> wrote:

> > In (info "(elisp) Pure Storage"):
> >  -- Variable: purify-flag
> > [...]
> >      This flag is `t' while loading all of the basic functions for
> >      building Emacs initially (allowing those functions to be shareable
> >      and non-collectible).
> > What does "shareable and non-collectible" mean here?

> Basically, the idea is that the "pure space" will never be written to,
> so the OS can use the same VM memory pages for the pure space of several
> Emacs processes.  I.e. the "pure space" can be shared among
> Emacs processes.
> Non-collectible means that they will never be garbage collected (the GC
> never even looks at them).

Ah, I see, thanks.

>         Stefan

Best regards, Xue Fuqiao.

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