Re: [PATCH v3 3/5] page_alloc: Introduce zone_movable_limit[] to keep movable limit for nodes

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On 12/11/2012 09:20 PM, Simon Jeons wrote:
> On Tue, 2012-12-11 at 20:41 +0800, Jianguo Wu wrote:
>> On 2012/12/11 20:24, Simon Jeons wrote:
>>
>>> On Tue, 2012-12-11 at 11:07 +0800, Jianguo Wu wrote:
>>>> On 2012/12/11 10:33, Tang Chen wrote:
>>>>
>>>>> This patch introduces a new array zone_movable_limit[] to store the
>>>>> ZONE_MOVABLE limit from movablecore_map boot option for all nodes.
>>>>> The function sanitize_zone_movable_limit() will find out to which
>>>>> node the ranges in movable_map.map[] belongs, and calculates the
>>>>> low boundary of ZONE_MOVABLE for each node.
>>>>>
>>>>> Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
>>>>> Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxx>
>>>>> Reviewed-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
>>>>> Reviewed-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
>>>>> Tested-by: Lin Feng <linfeng@xxxxxxxxxxxxxx>
>>>>> ---
>>>>>  mm/page_alloc.c |   77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>>>>  1 files changed, 77 insertions(+), 0 deletions(-)
>>>>>
>>>>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>>>>> index 1c91d16..4853619 100644
>>>>> --- a/mm/page_alloc.c
>>>>> +++ b/mm/page_alloc.c
>>>>> @@ -206,6 +206,7 @@ static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
>>>>>  static unsigned long __initdata required_kernelcore;
>>>>>  static unsigned long __initdata required_movablecore;
>>>>>  static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES];
>>>>> +static unsigned long __meminitdata zone_movable_limit[MAX_NUMNODES];
>>>>>  
>>>>>  /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */
>>>>>  int movable_zone;
>>>>> @@ -4340,6 +4341,77 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid,
>>>>>  	return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn);
>>>>>  }
>>>>>  
>>>>> +/**
>>>>> + * sanitize_zone_movable_limit - Sanitize the zone_movable_limit array.
>>>>> + *
>>>>> + * zone_movable_limit is initialized as 0. This function will try to get
>>>>> + * the first ZONE_MOVABLE pfn of each node from movablecore_map, and
>>>>> + * assigne them to zone_movable_limit.
>>>>> + * zone_movable_limit[nid] == 0 means no limit for the node.
>>>>> + *
>>>>> + * Note: Each range is represented as [start_pfn, end_pfn)
>>>>> + */
>>>>> +static void __meminit sanitize_zone_movable_limit(void)
>>>>> +{
>>>>> +	int map_pos = 0, i, nid;
>>>>> +	unsigned long start_pfn, end_pfn;
>>>>> +
>>>>> +	if (!movablecore_map.nr_map)
>>>>> +		return;
>>>>> +
>>>>> +	/* Iterate all ranges from minimum to maximum */
>>>>> +	for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) {
>>>>> +		/*
>>>>> +		 * If we have found lowest pfn of ZONE_MOVABLE of the node
>>>>> +		 * specified by user, just go on to check next range.
>>>>> +		 */
>>>>> +		if (zone_movable_limit[nid])
>>>>> +			continue;
>>>>> +
>>>>> +#ifdef CONFIG_ZONE_DMA
>>>>> +		/* Skip DMA memory. */
>>>>> +		if (start_pfn < arch_zone_highest_possible_pfn[ZONE_DMA])
>>>>> +			start_pfn = arch_zone_highest_possible_pfn[ZONE_DMA];
>>>>> +#endif
>>>>> +
>>>>> +#ifdef CONFIG_ZONE_DMA32
>>>>> +		/* Skip DMA32 memory. */
>>>>> +		if (start_pfn < arch_zone_highest_possible_pfn[ZONE_DMA32])
>>>>> +			start_pfn = arch_zone_highest_possible_pfn[ZONE_DMA32];
>>>>> +#endif
>>>>> +
>>>>> +#ifdef CONFIG_HIGHMEM
>>>>> +		/* Skip lowmem if ZONE_MOVABLE is highmem. */
>>>>> +		if (zone_movable_is_highmem() &&
>>>>
>>>> Hi Tang,
>>>>
>>>> I think zone_movable_is_highmem() is not work correctly here.
>>>> 	sanitize_zone_movable_limit
>>>> 		zone_movable_is_highmem      <--using movable_zone here
>>>> 	find_zone_movable_pfns_for_nodes
>>>> 		find_usable_zone_for_movable <--movable_zone is specified here
>>>>
>>>
>>> Hi Jiangguo and Chen,
>>>
>>> - What's the meaning of zone_movable_is_highmem(), does it mean all zone
>>> highmem pages are zone movable pages or ....
>>
>> Hi Simon,
>>
>> zone_movable_is_highmem() means whether zone pages in ZONE_MOVABLE are taken from
>> highmem.
>>
>>> - dmesg 
>>>
>>>> 0.000000] Zone ranges:
>>>> [    0.000000]   DMA      [mem 0x00010000-0x00ffffff]
>>>> [    0.000000]   Normal   [mem 0x01000000-0x373fdfff]
>>>> [    0.000000]   HighMem  [mem 0x373fe000-0xb6cfffff]
>>>> [    0.000000] Movable zone start for each node
>>>> [    0.000000]   Node 0: 0x97800000
>>>
>>> Why the start of zone movable is in the range of zone highmem, if all
>>> the pages of zone movable are from zone highmem? If the answer is yes, 
>>
>>> zone movable and zone highmem are in the equal status or not?
>>
>> The pages of zone_movable can be taken from zone_movalbe or zone_normal,
>> if we have highmem, then zone_movable will be taken from zone_highmem,
>> otherwise zone_movable will be taken from zone_normal.
>>
>> you can refer to find_usable_zone_for_movable().
> 
> Hi Jiangguo,
> 
> I have 8G memory, movablecore=5G, but dmesg looks strange, what
> happended to me?
Hi Simon,

Is there any other boot parameters for memory taken besides 'movablecore=5G'?

thanks,
linfeng
> 
>> [    0.000000] Zone ranges:
>> [    0.000000]   DMA      [mem 0x00010000-0x00ffffff]
>> [    0.000000]   Normal   [mem 0x01000000-0x373fdfff]
>> [    0.000000]   HighMem  [mem 0x373fe000-0xb6cfffff]
>> [    0.000000] Movable zone start for each node
>> [    0.000000]   Node 0: 0xb7000000
>> [    0.000000] Early memory node ranges
>> [    0.000000]   node   0: [mem 0x00010000-0x0009cfff]
>> [    0.000000]   node   0: [mem 0x00100000-0x1fffffff]
>> [    0.000000]   node   0: [mem 0x20200000-0x3fffffff]
>> [    0.000000]   node   0: [mem 0x40200000-0xb69cbfff]
>> [    0.000000]   node   0: [mem 0xb6a46000-0xb6a47fff]
>> [    0.000000]   node   0: [mem 0xb6b1c000-0xb6cfffff]
>> [    0.000000] On node 0 totalpages: 748095
>> [    0.000000]   DMA zone: 32 pages used for memmap
>> [    0.000000]   DMA zone: 0 pages reserved
>> [    0.000000]   DMA zone: 3949 pages, LIFO batch:0
>> [    0.000000]   Normal zone: 1736 pages used for memmap
>> [    0.000000]   Normal zone: 219958 pages, LIFO batch:31
>> [    0.000000]   HighMem zone: 4083 pages used for memmap
>> [    0.000000]   HighMem zone: 517569 pages, LIFO batch:31
>> [    0.000000]   Movable zone: 768 pages, LIFO batch:0
> 
>>
>> Thanks,
>> Jianguo Wu
>>
>>>
>>>> I think Jiang Liu's patch works fine for highmem, please refer to:
>>>> http://marc.info/?l=linux-mm&m=135476085816087&w=2
>>>>
>>>> Thanks,
>>>> Jianguo Wu
>>>>
>>>>> +		    start_pfn < arch_zone_lowest_possible_pfn[ZONE_HIGHMEM])
>>>>> +			start_pfn = arch_zone_lowest_possible_pfn[ZONE_HIGHMEM];
>>>>> +#endif
>>>>> +
>>>>> +		if (start_pfn >= end_pfn)
>>>>> +			continue;
>>>>> +
>>>>> +		while (map_pos < movablecore_map.nr_map) {
>>>>> +			if (end_pfn <= movablecore_map.map[map_pos].start_pfn)
>>>>> +				break;
>>>>> +
>>>>> +			if (start_pfn >= movablecore_map.map[map_pos].end_pfn) {
>>>>> +				map_pos++;
>>>>> +				continue;
>>>>> +			}
>>>>> +
>>>>> +			/*
>>>>> +			 * The start_pfn of ZONE_MOVABLE is either the minimum
>>>>> +			 * pfn specified by movablecore_map, or 0, which means
>>>>> +			 * the node has no ZONE_MOVABLE.
>>>>> +			 */
>>>>> +			zone_movable_limit[nid] = max(start_pfn,
>>>>> +					movablecore_map.map[map_pos].start_pfn);
>>>>> +
>>>>> +			break;
>>>>> +		}
>>>>> +	}
>>>>> +}
>>>>> +
>>>>>  #else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
>>>>>  static inline unsigned long __meminit zone_spanned_pages_in_node(int nid,
>>>>>  					unsigned long zone_type,
>>>>> @@ -4358,6 +4430,10 @@ static inline unsigned long __meminit zone_absent_pages_in_node(int nid,
>>>>>  	return zholes_size[zone_type];
>>>>>  }
>>>>>  
>>>>> +static void __meminit sanitize_zone_movable_limit(void)
>>>>> +{
>>>>> +}
>>>>> +
>>>>>  #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
>>>>>  
>>>>>  static void __meminit calculate_node_totalpages(struct pglist_data *pgdat,
>>>>> @@ -4923,6 +4999,7 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn)
>>>>>  
>>>>>  	/* Find the PFNs that ZONE_MOVABLE begins at in each node */
>>>>>  	memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn));
>>>>> +	sanitize_zone_movable_limit();
>>>>>  	find_zone_movable_pfns_for_nodes();
>>>>>  
>>>>>  	/* Print out the zone ranges */
>>>>
>>>>
>>>>
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>>> .
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>>
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>>
> 
> 
> 
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