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

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On Wed, 2012-12-12 at 09:57 +0800, Jianguo Wu wrote:
> On 2012/12/11 21:20, 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,
> 
> I think you used 32bit kernel, and didn't enable CONFIG_X86_PAE, right?
> So, it can only address memory below 4G.

Thanks for you response. Enable PAE on x86 32bit kernel, 8G memory,
movablecore=6.5G

[    0.000000] 8304MB HIGHMEM available.
[    0.000000] 885MB LOWMEM available.
[    0.000000]   mapped low ram: 0 - 375fe000
[    0.000000]   low ram: 0 - 375fe000
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x00010000-0x00ffffff]
[    0.000000]   Normal   [mem 0x01000000-0x375fdfff]
[    0.000000]   HighMem  [mem 0x375fe000-0x3e5fffff]
[    0.000000] Movable zone start for each node
[    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]   node   0: [mem 0x00000000-0x3e5fffff]
[    0.000000] On node 0 totalpages: 2051391
[    0.000000] free_area_init_node: node 0, pgdat c0c26a80, node_mem_map
f19de200
[    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: 1740 pages used for memmap
[    0.000000]   Normal zone: 220466 pages, LIFO batch:31
[    0.000000]   HighMem zone: 16609 pages used for memmap
[    0.000000]   HighMem zone: 1808595 pages, LIFO batch:31

Why zone movable disappear?

> 
> Thanks,
> Jianguo Wu
> 
> >> [    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 */
> >>>>
> >>>>
> >>>>
> >>>> --
> >>>> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> >>>> the body to majordomo@xxxxxxxxx.  For more info on Linux MM,
> >>>> see: http://www.linux-mm.org/ .
> >>>> Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
> >>>
> >>>
> >>>
> >>> .
> >>>
> >>
> >>
> >>
> > 
> > 
> > 
> > .
> > 
> 
> 
> 


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