Improving the kernel/i386 timecounter performance (GSoC proposal)

[David Xu]

Julian Elischer wrote:
> David Xu wrote:
>> Julian Elischer wrote:
>>> David Xu wrote:
>>>> David Xu wrote:
>>>>> Julian Elischer wrote:
>>>>>
>>>>>> depends on the hardware.
>>>>>> anyhow I was only saying it was possible, not necessarily
>>>>>> good or even useful.
>>>>>>
>>>>>>
>>>>>
>>>>> I had done some works for thread private page shared by kernel
>>>>> and userland when I was doing userland spinlock, if userland asks
>>>>> a page, kernel will allocate it and put some interesting thing in
>>>>> it by scheduler etcs, these code may be useful.
>>>>>
>>>> FYI:
>>>> http://people.freebsd.org/~davidxu/schedctl/
>>>
>>> reading this quickly, you allocate a separately addressed page for
>>> each thread, but,  how do you use it?
>>>
>>>
>> I store the address in userland TLS area, then get it when I want to
>> check some scheduling informations.
> 
> and the scheduler writes out interesting information to that
> location?...
> 
> 
Yes.