Date: Sat, 24 Feb 2001 19:59:14 -0800 From: Julian Elischer <julian@elischer.org> To: Peter Seebach <seebs@plethora.net> Cc: freebsd-hackers@freebsd.org Subject: Re: Setting memory allocators for library functions. Message-ID: <3A988312.2E238F48@elischer.org> References: <200102241643.f1OGhw616627@guild.plethora.net>
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Peter Seebach wrote:
>
> In message <xzpu25km6mm.fsf@flood.ping.uio.no>, Dag-Erling Smorgrav writes:
> >This is all academic since FreeBSD does memory overcommit, so unless
> >you run out of address space for your process before you run out of
> >actual memory and/or swap (not likely, but quite possible) malloc()
> >will never return NULL and you won't know a thing until you dirty one
> >page too many and segfault.
>
> Is there any hope that, some day, a setting could be provided where a program
> could request that malloc *NOT* overcommit? There are programs which would
> rather know in advance, and clean up, than be killed abruptly.
>
to not be caught by surprise,
simply touch every page after you allocate it.
> (To be pedantic, this is a conformance issue. If the memory isn't actually
> allocated, malloc shouldn't be returning a non-null pointer.)
>
> -s
>
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