From: Arjan van de Ven <arjan@infradead.org>
To: "Robert W. Fuller" <orangemagicbus@sbcglobal.net>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: address space reservation functionality?
Date: Tue, 11 Jan 2005 08:42:42 +0100 [thread overview]
Message-ID: <1105429362.3917.2.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <41E2EB09.5000603@sbcglobal.net>
On Mon, 2005-01-10 at 15:52 -0500, Robert W. Fuller wrote:
> Hi,
>
> I was wondering if some functionality existed in Linux. Specifically,
> in Solaris, you can mmap the null device in order to reserve part of the
> address space without otherwise consuming resources. This is detailed
> in the Solaris manpage null(7D). The same functionality is also
> available under Windows NT/XP/2K by calling the VirtualAlloc function
> with the MEM_RESERVE flag omitting the MEM_COMMIT flag. Does Linux have
> a similar mechanism buried somewhere whereby I can reserve a part of the
> address space and not increase the "virtual size" of the process or the
> system's idea of the amount of memory in use? I could not find one by
> using the source.
malloc() already does this...
what you describe is the default behavior of linux; only when you
actually write to the memory does it get backed by ram.
next prev parent reply other threads:[~2005-01-11 7:46 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-10 20:52 address space reservation functionality? Robert W. Fuller
2005-01-11 7:42 ` Arjan van de Ven [this message]
2005-01-11 18:39 ` Robert W. Fuller
2005-01-11 18:51 ` Robert W. Fuller
2005-01-11 19:19 ` Arjan van de Ven
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