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From: munir@hpfcmgw.HP.COM (Munir Mallal)
Newsgroups: comp.sys.hp
Subject: Re: Further question about iomap
Message-ID: <1080171@hpfcmgw.HP.COM>
Date: 4 Oct 90 18:03:35 GMT
References: <10647@pt.cs.cmu.edu>
Organization: HP Fort Collins, CO
Lines: 12

>> If you specify an
>> addr of zero, then the system picks an address just above the top of the
>> highest malloc'd area.

>This is something I discovered the hard way, and I think it sucks.
>Once you have iomapped something with the default address, you cannot
>malloc more than a couple dozen Kbytes of additional memory.  This is 
>not a reasonable default.

Not quite, the default is controlled by a kernel parameter shmbrk.  The
default for this is 16 x 4K pages (64K Bytes).  Build a kernel with a
value you feel is more convenient.