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Re: [v6 02/15] x86/mm: setting fields in deferred pages

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  Re: [v6 02/15] x86/mm: setting fields in deferred pages Michal Hocko <mhocko@kernel.org> - 2017-08-14 13:50 +0200
    Re: [v6 02/15] x86/mm: setting fields in deferred pages Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-08-14 15:40 +0200

#1710860 — Re: [v6 02/15] x86/mm: setting fields in deferred pages

On Fri 11-08-17 11:39:41, Pasha Tatashin wrote:
> >AFAIU register_page_bootmem_info_node is only about struct pages backing
> >pgdat, usemap and memmap. Those should be in reserved memblocks and we
> >do not initialize those at later times, they are not relevant to the
> >deferred initialization as your changelog suggests so the ordering with
> >get_page_bootmem shouldn't matter. Or am I missing something here?
> 
> The pages for pgdata, usemap, and memmap are part of reserved, and thus
> getting initialized when free_all_bootmem() is called.
> 
> So, we have something like this in mem_init()
> 
> register_page_bootmem_info
>  register_page_bootmem_info_node
>   get_page_bootmem
>    .. setting fields here ..
>    such as: page->freelist = (void *)type;
> 
> free_all_bootmem()
>  free_low_memory_core_early()
>   for_each_reserved_mem_region()
>    reserve_bootmem_region()
>     init_reserved_page() <- Only if this is deferred reserved page
>      __init_single_pfn()
>       __init_single_page()
>           memset(0) <-- Loose the set fields here!

OK, I have missed that part. Please make it explicit in the changelog.
It is quite easy to get lost in the deep call chains.
-- 
Michal Hocko
SUSE Labs

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#1710925

On 08/14/2017 07:43 AM, Michal Hocko wrote:
>> register_page_bootmem_info
>>   register_page_bootmem_info_node
>>    get_page_bootmem
>>     .. setting fields here ..
>>     such as: page->freelist = (void *)type;
>>
>> free_all_bootmem()
>>   free_low_memory_core_early()
>>    for_each_reserved_mem_region()
>>     reserve_bootmem_region()
>>      init_reserved_page() <- Only if this is deferred reserved page
>>       __init_single_pfn()
>>        __init_single_page()
>>            memset(0) <-- Loose the set fields here!
> OK, I have missed that part. Please make it explicit in the changelog.
> It is quite easy to get lost in the deep call chains.

Ok, will update comment.

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