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SubjectRe: [PATCH -V9 04/15] hugetlb: use mmu_gather instead of a temporary linked list for accumulating pages
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Michal Hocko <mhocko@suse.cz> writes:

> On Wed 13-06-12 15:57:23, Aneesh Kumar K.V wrote:
>> From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
>>
>> Use a mmu_gather instead of a temporary linked list for accumulating
>> pages when we unmap a hugepage range
>
> Sorry for coming up with the comment that late but you owe us an
> explanation _why_ you are doing this.
>
> I assume that this fixes a real problem when we take i_mmap_mutex
> already up in
> unmap_mapping_range
> mutex_lock(&mapping->i_mmap_mutex);
> unmap_mapping_range_tree | unmap_mapping_range_list
> unmap_mapping_range_vma
> zap_page_range_single
> unmap_single_vma
> unmap_hugepage_range
> mutex_lock(&vma->vm_file->f_mapping->i_mmap_mutex);
>
> And that this should have been marked for stable as well (I haven't
> checked when this has been introduced).

Switch to mmu_gather is to get rid of the use of page->lru so that i can use it for
active list.


-aneesh



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