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SubjectRe: [PATCH v2 08/20] mm, hugetlb: region manipulation functions take resv_map rather list_head
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Joonsoo Kim <iamjoonsoo.kim@lge.com> writes:

> To change a protection method for region tracking to find grained one,
> we pass the resv_map, instead of list_head, to region manipulation
> functions. This doesn't introduce any functional change, and it is just
> for preparing a next step.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 8751e2c..d9cabf6 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -150,8 +150,9 @@ struct file_region {
> long to;
> };
>
> -static long region_add(struct list_head *head, long f, long t)
> +static long region_add(struct resv_map *resv, long f, long t)
> {
> + struct list_head *head = &resv->regions;
> struct file_region *rg, *nrg, *trg;
>
> /* Locate the region we are either in or before. */
> @@ -186,8 +187,9 @@ static long region_add(struct list_head *head, long f, long t)
> return 0;
> }
>
> -static long region_chg(struct list_head *head, long f, long t)
> +static long region_chg(struct resv_map *resv, long f, long t)
> {
> + struct list_head *head = &resv->regions;
> struct file_region *rg, *nrg;
> long chg = 0;
>
> @@ -235,8 +237,9 @@ static long region_chg(struct list_head *head, long f, long t)
> return chg;
> }
>
> -static long region_truncate(struct list_head *head, long end)
> +static long region_truncate(struct resv_map *resv, long end)
> {
> + struct list_head *head = &resv->regions;
> struct file_region *rg, *trg;
> long chg = 0;
>
> @@ -265,8 +268,9 @@ static long region_truncate(struct list_head *head, long end)
> return chg;
> }
>
> -static long region_count(struct list_head *head, long f, long t)
> +static long region_count(struct resv_map *resv, long f, long t)
> {
> + struct list_head *head = &resv->regions;
> struct file_region *rg;
> long chg = 0;
>
> @@ -392,7 +396,7 @@ void resv_map_release(struct kref *ref)
> struct resv_map *resv_map = container_of(ref, struct resv_map, refs);
>
> /* Clear out any active regions before we release the map. */
> - region_truncate(&resv_map->regions, 0);
> + region_truncate(resv_map, 0);
> kfree(resv_map);
> }
>
> @@ -1099,7 +1103,7 @@ static long vma_needs_reservation(struct hstate *h,
> pgoff_t idx = vma_hugecache_offset(h, vma, addr);
> struct resv_map *resv = vma_resv_map(vma);
>
> - err = region_chg(&resv->regions, idx, idx + 1);
> + err = region_chg(resv, idx, idx + 1);
> if (err < 0)
> return err;
> return 0;
> @@ -1121,9 +1125,8 @@ static void vma_commit_reservation(struct hstate *h,
> pgoff_t idx = vma_hugecache_offset(h, vma, addr);
> struct resv_map *resv = vma_resv_map(vma);
>
> - /* Mark this page used in the map. */
> - region_add(&resv->regions, idx, idx + 1);
> - }
> + idx = vma_hugecache_offset(h, vma, addr);
> + region_add(resv, idx, idx + 1);
> }
>
> static struct page *alloc_huge_page(struct vm_area_struct *vma,
> @@ -2211,7 +2214,7 @@ static void hugetlb_vm_op_close(struct vm_area_struct *vma)
> end = vma_hugecache_offset(h, vma, vma->vm_end);
>
> reserve = (end - start) -
> - region_count(&resv->regions, start, end);
> + region_count(resv, start, end);
>
> resv_map_put(vma);
>
> @@ -3091,7 +3094,7 @@ int hugetlb_reserve_pages(struct inode *inode,
> if (!vma || vma->vm_flags & VM_MAYSHARE) {
> resv_map = inode->i_mapping->private_data;
>
> - chg = region_chg(&resv_map->regions, from, to);
> + chg = region_chg(resv_map, from, to);
>
> } else {
> resv_map = resv_map_alloc();
> @@ -3137,7 +3140,7 @@ int hugetlb_reserve_pages(struct inode *inode,
> * else has to be done for private mappings here
> */
> if (!vma || vma->vm_flags & VM_MAYSHARE)
> - region_add(&resv_map->regions, from, to);
> + region_add(resv_map, from, to);
> return 0;
> out_err:
> if (vma)
> @@ -3153,7 +3156,7 @@ void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed)
> struct hugepage_subpool *spool = subpool_inode(inode);
>
> if (resv_map)
> - chg = region_truncate(&resv_map->regions, offset);
> + chg = region_truncate(resv_map, offset);
> spin_lock(&inode->i_lock);
> inode->i_blocks -= (blocks_per_huge_page(h) * freed);
> spin_unlock(&inode->i_lock);
> --
> 1.7.9.5



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