Large mem disk with not very recent current

Roman Kurakin rik at
Tue Sep 14 14:11:17 PDT 2004

Scott Long wrote:

> Roman Kurakin wrote:
>> Kris Kennaway wrote:
>>> On Mon, Sep 13, 2004 at 12:56:51PM +0400, Roman Kurakin wrote:
>>>> Hi,
>>>>   I have the following idea/problem. I want to build world in memory.
>>>> I've put in to my system 1G of memory and tried to put on it sources.
>>>> But all times I've tried to do that system went to panic. I've used md
>>>> with malloc type.
>>>>   Any ideas?
>>> Please provide more information.  It's likely you're trying to create
>>> a md that is too big, though.
>> It is about 800Mb. But system panics while I try to extract source 
>> tree. It is not very recent
>> current. The intent of my question was to get some hints how to set 
>> up such build area, I
>> belive it should help to make compilation much faster than using hard 
>> drive. My home system
>> is not ready for panic investigation now. I'll update it to current 
>> and set console to it and will
>> try again.
>> PS. Sorry to all for my last posts to current that are so weak in 
>> "technical" details, the debug
>> technique I used before was without remote debugging since most of 
>> problems were very
>> near my code and it was enough for me anlo three things: my mind, 
>> printed sources, and printf.
>> So now I am in stage of adaptation to/setting up remote debugging.
>> rik
> What kind of panic was it?  Try using swap backing instead of malloc. 

kmem_map too small.

> Malloc will consume wired memory and will generally make life difficult
> for other parts of the kernel that need memory later.  Swap-backed pages
> will stay in RAM until the VM needs to push them out due to memory
> pressure. 

Ok. I'll try to try this this night.



> Scott

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