From owner-freebsd-hackers  Wed Feb 10 09:53:47 1999
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To: Terry Lambert <tlambert@primenet.com>
cc: dillon@apollo.backplane.com, kuku@gilberto.physik.RWTH-Aachen.DE,
        hackers@FreeBSD.ORG
Subject: Re: portability of shm, mmap, pipes and socket IPC 
In-reply-to: Your message of "Wed, 10 Feb 1999 17:24:00 GMT."
             <199902101724.KAA13526@usr07.primenet.com> 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Wed, 10 Feb 1999 09:42:16 -0800
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>> >:The overall size of the shared memory segment is limited to that
>> >:	which can fit in the kernels virtual address space; this
>> >:	artificially restricts the maximum size.
>> 
>>    That isn't true and hasn't been true for several years in FreeBSD.
>
>Are you sure?

   Yes, I'm quite sure.

>>From my reading of sysv_shm.c:
>
>	shmmap_s = malloc(size, M_SHM, M_WAITOK);
>
>seems to limit the size to what's allocable in the KVA.

   The above malloc allocates space for a struct shmmap_state. RTSL.

-DG

David Greenman
Co-founder/Principal Architect, The FreeBSD Project

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