Kernel thread stack size

[Warner Losh]

On Jul 24, 2012, at 6:40 PM, Paul Ambrose wrote:

> #define PAGE_SHIFT 12
> #define PAGE_SIZE  (1<<PAGE_SHIFT)
> 
> #define KSTACK_PAGES 2
> #define KSTACK_GUARD_PAGES 2
> 
> I had a MIPS machine (Loongson 3A) with page size 16KB( could be 4KB, but
> had to handle cache alias in OS), IMHO,  define KSTACK_PAGE to 1 is enough,
> what is your opinion?

Well, the PTE has two entries, so having just one page would be inefficient.

Warner

> 2012/7/23 Konstantin Belousov <kostikbel at gmail.com>
> 
>> On Mon, Jul 23, 2012 at 02:54:30AM -0400, Richard Yao wrote:
>>> What is the default kernel thread stack size on FreeBSD? I am
>>> particularly interested in knowing about i386 and amd64, but knowing
>>> this for other architectures (such as MIPS) would also be useful.
>>> 
>> 
>> Look for the KSTACK_PAGES symbol defined in sys/<arch>/include/param.h.
>> It defines _default_ number of pages allocated for kernel stack of
>> new thread.
>> 
>> We have 4 pages for amd64, and 2 pages for i386, AFAIR. Look up the MIPS
>> yourself.
>> 
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