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SubjectRe: [PATCH 13/35] x86, lmb: Add lmb_free_memory_size()
On 05/13/2010 07:31 PM, Benjamin Herrenschmidt wrote:
> On Thu, 2010-05-13 at 17:19 -0700, Yinghai Lu wrote:
>> It will return free memory size in specified range.
>>
>> We can not use memory_size - reserved_size here, because some reserved area
>> may not be in the scope of lmb.memory.region.
>>
>> Use lmb.memory.region subtracting lmb.reserved.region to get free range array.
>> then count size of all free ranges.
>
> I remember having already told you that the naming sucks.

any suggestion?

i think this name is clear.

>
> Also, you fail to explain what this is actually needed for.

needed by

[PATCH 21/35] x86, lmb: Use lmb_memory_size()/lmb_free_memory_size() to get correct dma_reserve


>
> Cheers,
> Ben.
>
>> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
>> ---
>> arch/x86/include/asm/lmb.h | 1 +
>> arch/x86/mm/lmb.c | 51 ++++++++++++++++++++++++++++++++++++++++++++
>> 2 files changed, 52 insertions(+), 0 deletions(-)
>>
>> diff --git a/arch/x86/include/asm/lmb.h b/arch/x86/include/asm/lmb.h
>> index 358d8a6..4fb94b5 100644
>> --- a/arch/x86/include/asm/lmb.h
>> +++ b/arch/x86/include/asm/lmb.h
>> @@ -16,5 +16,6 @@ void lmb_register_active_regions(int nid, unsigned long start_pfn,
>> unsigned long last_pfn);
>> u64 lmb_hole_size(u64 start, u64 end);
>> u64 lmb_find_area_node(int nid, u64 start, u64 end, u64 size, u64 align);
>> +u64 lmb_free_memory_size(u64 addr, u64 limit);
>>
>> #endif
>> diff --git a/arch/x86/mm/lmb.c b/arch/x86/mm/lmb.c
>> index c5fa1dd..6c69e99 100644
>> --- a/arch/x86/mm/lmb.c
>> +++ b/arch/x86/mm/lmb.c
>> @@ -226,6 +226,57 @@ void __init lmb_to_bootmem(u64 start, u64 end)
>> }
>> #endif
>>
>> +u64 __init lmb_free_memory_size(u64 addr, u64 limit)
>> +{
>> + int i, count;
>> + struct range *range;
>> + int nr_range;
>> + u64 final_start, final_end;
>> + u64 free_size;
>> +
>> + count = (lmb.reserved.cnt + lmb.memory.cnt) * 2;
>> +
>> + range = find_range_array(count);
>> + nr_range = 0;
>> +
>> + addr = PFN_UP(addr);
>> + limit = PFN_DOWN(limit);
>> +
>> + for (i = 0; i < lmb.memory.cnt; i++) {
>> + struct lmb_region *r = &lmb.memory.regions[i];
>> +
>> + final_start = PFN_UP(r->base);
>> + final_end = PFN_DOWN(r->base + r->size);
>> + if (final_start >= final_end)
>> + continue;
>> + if (final_start >= limit || final_end <= addr)
>> + continue;
>> +
>> + nr_range = add_range(range, count, nr_range, final_start, final_end);
>> + }
>> + subtract_range(range, count, 0, addr);
>> + subtract_range(range, count, limit, -1ULL);
>> + for (i = 0; i < lmb.reserved.cnt; i++) {
>> + struct lmb_region *r = &lmb.reserved.regions[i];
>> +
>> + final_start = PFN_DOWN(r->base);
>> + final_end = PFN_UP(r->base + r->size);
>> + if (final_start >= final_end)
>> + continue;
>> + if (final_start >= limit || final_end <= addr)
>> + continue;
>> +
>> + subtract_range(range, count, final_start, final_end);
>> + }
>> + nr_range = clean_sort_range(range, count);
>> +
>> + free_size = 0;
>> + for (i = 0; i < nr_range; i++)
>> + free_size += range[i].end - range[i].start;
>> +
>> + return free_size << PAGE_SHIFT;
>> +}
>> +
>> void __init lmb_add_memory(u64 start, u64 end)
>> {
>> lmb_add_region(&lmb.memory, start, end - start);
>



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