Anshuman Khandual <khand...@linux.vnet.ibm.com> writes:
> On 10/15/2015 09:16 PM, Anshuman Khandual wrote:
>> This adds two tests for memory page migration. One for normal page
>> migration which works for both 4K or 64K base page size kernel and
>> the other one is for 16MB huge page migration which will work both
>> 4K or 64K base page sized 16MB huge pages as and when we support
>> huge page migration.
>>
>> Signed-off-by: Anshuman Khandual <khand...@linux.vnet.ibm.com>
>> ---
>> - Works for normal page migration on both 64K and 4K base pages
>> - Works for 16MB huge page migration (64K) on Aneesh's V2 PTE changes
>>
>> +
>> +int test_migration(unsigned long length)
>> +{
>> + unsigned long failed;
>> + void *addr;
>> + int ret;
>> +
>> + addr = mmap(MMAP_ADDR, length, MMAP_PROT, MMAP_FLAGS, -1, 0);
>> + if (addr == MAP_FAILED) {
>> + perror("mmap() failed");
>> + exit(-1);
>> + }
>
> Will add a mlock() call here as well. Some times soft offline
> fails while trying to move a huge chunk of memory on a system
> because of swapping. With a mlock() in there the problem gets
> resolved.
Is that with respect to hugetlb pages ? I doubt, because hugetlb pages
are not swapped out.
-aneesh
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