Subject: Re: sparse core dumps?
To: Matt Thomas <firstname.lastname@example.org>
From: Nathan J. Williams <email@example.com>
Date: 06/02/2004 18:31:01
Matt Thomas <firstname.lastname@example.org> writes:
> I've proposed before that a read-only access to a demand zero page does
> not allocate a new page, but instead generates a copy-on-write reference
> to a zero-page. (instead of allocating a free page and placing a
> writable page into the vmspace).
That's a somewhat different problem; the memory doesn't have to have
even been read, as in Hubert's example, or in a mmap(MAP_ANON).
> The other alternative is to make the coredump code much more
> knowledgeable about uvm internals so it can create sections akin to
> .bss (ALLOC but no CONTENTS).