Re: [PATCH v2 1/3] mm/sparse: optimize sparse_index_alloc

[Gavin Shan <shangw@linux.vnet.ibm.com>]

>> With CONFIG_SPARSEMEM_EXTREME, the two level of memory section
>> descriptors are allocated from slab or bootmem. When allocating
>> from slab, let slab/bootmem allocator to clear the memory chunk.
>> We needn't clear that explicitly.
>> 
>> Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
>> Reviewed-by: Michal Hocko <mhocko@suse.cz>
>
>Well, I don't remember to give my r-b but now you have it official
>(please do not do that in future)

Ok. I thought anybody gave comments should be put into r-b list, which
is wrong. I won't do it and thanks for your comments :-)

>Reviewed-by: Michal Hocko <mhocko@suse.cz>

Thanks, Michal.

Gavin

>
>> ---
>>  mm/sparse.c |   10 ++++------
>>  1 file changed, 4 insertions(+), 6 deletions(-)
>> 
>> diff --git a/mm/sparse.c b/mm/sparse.c
>> index 6a4bf91..781fa04 100644
>> --- a/mm/sparse.c
>> +++ b/mm/sparse.c
>> @@ -65,14 +65,12 @@ static struct mem_section noinline __init_refok *sparse_index_alloc(int nid)
>>  
>>  	if (slab_is_available()) {
>>  		if (node_state(nid, N_HIGH_MEMORY))
>> -			section = kmalloc_node(array_size, GFP_KERNEL, nid);
>> +			section = kzalloc_node(array_size, GFP_KERNEL, nid);
>>  		else
>> -			section = kmalloc(array_size, GFP_KERNEL);
>> -	} else
>> +			section = kzalloc(array_size, GFP_KERNEL);
>> +	} else {
>>  		section = alloc_bootmem_node(NODE_DATA(nid), array_size);
>> -
>> -	if (section)
>> -		memset(section, 0, array_size);
>> +	}
>>  
>>  	return section;
>>  }
>> -- 
>> 1.7.9.5
>> 
>
>-- 
>Michal Hocko
>SUSE Labs
>SUSE LINUX s.r.o.
>Lihovarska 1060/12
>190 00 Praha 9    
>Czech Republic
>
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