linux-kernel - Re: One problem in reassign pci bus number?

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Message-ID: <20120507011722.GA8122@richard>
Date:	Mon, 7 May 2012 09:17:22 +0800
From:	Richard Yang <weiyang@...ux.vnet.ibm.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Richard Yang <weiyang@...ux.vnet.ibm.com>,
	Wei Yang <weiyang.kernel@...il.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: One problem in reassign pci bus number?

On Sun, May 06, 2012 at 09:36:35AM -0700, Yinghai Lu wrote:
>On Sun, May 6, 2012 at 9:35 AM, Yinghai Lu <yinghai@...nel.org> wrote:
>> On Sun, May 6, 2012 at 8:17 AM, Richard Yang <weiyang@...ux.vnet.ibm.com> wrote:
>>> On Fri, May 04, 2012 at 10:37:08AM -0700, Yinghai Lu wrote:
>>>>On Thu, May 3, 2012 at 9:52 PM, Richard Yang <weiyang@...ux.vnet.ibm.com> wrote:
>>>>>
>>>>> BTW, even if this value is returned by __find_res_top_free_size(), or
>>>>> returned after this function is called, the purpose of the
>>>>> __find_res_top_free_size() is to get the biggest free space under the
>>>>> first parameter?
>>>>
>>>>__find_res_top_free_size() is used to get size just under top,  and
>>>>then use it to calculate size above top that need to be extended.
>>>>
>>>>at last will combine free size under top and allocated size above top
>>>>and return.
>>> Yes, I get the general idea.
>>>
>>> then I want to confirm which size __find_res_top_free_size() will return.
>>>
>>> Come to the previous question, for one resource like this.
>>> res =   90-150
>>>    ->child      105-140
>>> We call __find_res_top_free_size(res, 1);
>>> This function should return which size?  10? 15? or 25?
>>>
>>> From the code
>>> +               ret = __allocate_resource(res, &tmp_res, n_size,
>>> +                       res->end - n_size + skip_nr, res->end,
>>> +                       1, NULL, NULL, false);
>>> I think it will check the free space near the end of res.
>>
>> yes. it is 15, [141-150]
>
>should 10, aka [141-150]
Thanks, 
so this free space will be combined with the free space got from
parent, form a big space to meet the requirement.

This is the general idea about probe_resource()?

And this is the design decision to find the free space at the end 
of top, even at the start we have more free space?

-- 
Richard Yang
Help you, Help me

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