Re: [PATCH 2/3] mincore: Introduce the MINCORE_ANON bit

[KOSAKI Motohiro <kosaki.motohiro@gmail.com>]

2011/12/26 Pavel Emelyanov <xemul@parallels.com>:
> On 12/26/2011 04:05 AM, KOSAKI Motohiro wrote:
>>> +static unsigned char mincore_pte(struct vm_area_struct *vma, unsigned long addr, pte_t pte)
>>> +{
>>> +       struct page *pg;
>>> +
>>> +       pg = vm_normal_page(vma, addr, pte);
>>> +       if (!pg)
>>> +               return 0;
>>> +       else
>>> +               return PageAnon(pg) ? MINCORE_ANON : 0;
>>> +}
>>> +
>>
>> How do your program handle tmpfs pages (and/or ram device pages)?
>
> Do you mean mapped files from tmpfs? Currently just any other file.
> Do you see problems with this patch wrt tmpfs?

If you don't save mapped file on tmpfs or other volatile devices, the process
might not restored. The data might already destroyed. The common strategy
are two,

1) save all opened file by different ways.
2) save all mapped file even though clean file cache.

In both case, we don't reduce freezed data size. So, I'm interesting
you strategy.

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