Date: Wed, 03 Oct 2001 12:23:12 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Dwayne.MacKinnon@xwave.com Cc: freebsd-hackers@freebsd.org Subject: Re: Memory allocation question Message-ID: <3BBB65A0.65FE804B@mindspring.com> References: <3BBA29C0.5E125DAF@xwave.com>
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Dwayne wrote: > I'm creating an app where I want to use memory to store data so I > can get at it quickly. The problem is, I can't afford the delays that > would occur if the memory gets swapped out. Is there any way in FreeBSD > to allocate memory so that the VM system won't swap it out? Allocate it at boot time in machdep.c; that's one way, but that's mostly for use in the kernel (though you could set the PG_U bit on the pages, which would double map them in both the kernel and all user space processes. Another way is to put it in a System V shared memory segment, and set the sysctl option that wires it down. Have you read the madvise() man page? -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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