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POThe stack size used in kernel development
 

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    <p>I'm developing an operating system and rather than programming the kernel, I'm designing the kernel. This operating system is targeted at the x86 architecture and my target is for modern computers. The estimated number of required RAM is 256Mb or more.</p> <p>What is a good size to make the stack for each thread run on the system? Should I try to design the system in such a way that the stack can be extended automatically if the maximum length is reached?</p> <p>I think if I remember correctly that a page in RAM is 4k or 4096 bytes and that just doesn't seem like a lot to me. I can definitely see times, especially when using lots of recursion, that I would want to have more than 1000 integars in RAM at once. Now, the real solution would be to have the program doing this by using <code>malloc</code> and manage its own memory resources, but really I would like to know the user opinion on this.</p> <p>Is 4k big enough for a stack with modern computer programs? Should the stack be bigger than that? Should the stack be auto-expanding to accommodate any types of sizes? I'm interested in this both from a practical developer's standpoint and a security standpoint.</p> <p>Is 4k too big for a stack? Considering normal program execution, especially from the point of view of classes in C++, I notice that good source code tends to <code>malloc/new</code> the data it needs when classes are created, to minimize the data being thrown around in a function call.</p> <p>What I haven't even gotten into is the size of the processor's cache memory. Ideally, I think the stack would reside in the cache to speed things up and I'm not sure if I need to achieve this, or if the processor can handle it for me. I was just planning on using regular boring old RAM for testing purposes. I can't decide. What are the options?</p>
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