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SubjectRe: [PATCH v2 11/20] mm, hugetlb: make vma_resv_map() works for all mapping type
Date
Joonsoo Kim <iamjoonsoo.kim@lge.com> writes:

> Util now, we get a resv_map by two ways according to each mapping type.
> This makes code dirty and unreadable. So unfiying it.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 869c3e0..e6c0c77 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -421,13 +421,24 @@ void resv_map_release(struct kref *ref)
> kfree(resv_map);
> }
>
> +static inline struct resv_map *inode_resv_map(struct inode *inode)
> +{
> + return inode->i_mapping->private_data;
> +}

it would be nice to get have another function that will return resv_map
only if we have HPAGE_RESV_OWNER. So that we could use that in
hugetlb_vm_op_open/close. ? Otherwise

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




> +
> static struct resv_map *vma_resv_map(struct vm_area_struct *vma)
> {
> VM_BUG_ON(!is_vm_hugetlb_page(vma));
> - if (!(vma->vm_flags & VM_MAYSHARE))
> + if (vma->vm_flags & VM_MAYSHARE) {
> + struct address_space *mapping = vma->vm_file->f_mapping;
> + struct inode *inode = mapping->host;
> +
> + return inode_resv_map(inode);
> +
> + } else {
> return (struct resv_map *)(get_vma_private_data(vma) &
> ~HPAGE_RESV_MASK);
> - return NULL;
> + }
> }
>
> static void set_vma_resv_map(struct vm_area_struct *vma, struct resv_map *map)
> @@ -1107,44 +1118,31 @@ static void return_unused_surplus_pages(struct hstate *h,
> static long vma_needs_reservation(struct hstate *h,
> struct vm_area_struct *vma, unsigned long addr)
> {
> - struct address_space *mapping = vma->vm_file->f_mapping;
> - struct inode *inode = mapping->host;
> -
> - if (vma->vm_flags & VM_MAYSHARE) {
> - pgoff_t idx = vma_hugecache_offset(h, vma, addr);
> - struct resv_map *resv = inode->i_mapping->private_data;
> -
> - return region_chg(&resv->regions, idx, idx + 1);
> + struct resv_map *resv;
> + pgoff_t idx;
> + long chg;
>
> - } else if (!is_vma_resv_set(vma, HPAGE_RESV_OWNER)) {
> + resv = vma_resv_map(vma);
> + if (!resv)
> return 1;
>
> - } else {
> - long err;
> - pgoff_t idx = vma_hugecache_offset(h, vma, addr);
> - struct resv_map *resv = vma_resv_map(vma);
> + idx = vma_hugecache_offset(h, vma, addr);
> + chg = region_chg(resv, idx, idx + 1);
>
> - err = region_chg(resv, idx, idx + 1);
> - if (err < 0)
> - return err;
> - return 0;
> - }
> + if (vma->vm_flags & VM_MAYSHARE)
> + return chg;
> + else
> + return chg < 0 ? chg : 0;
> }
> static void vma_commit_reservation(struct hstate *h,
> struct vm_area_struct *vma, unsigned long addr)
> {
> - struct address_space *mapping = vma->vm_file->f_mapping;
> - struct inode *inode = mapping->host;
> -
> - if (vma->vm_flags & VM_MAYSHARE) {
> - pgoff_t idx = vma_hugecache_offset(h, vma, addr);
> - struct resv_map *resv = inode->i_mapping->private_data;
> -
> - region_add(&resv->regions, idx, idx + 1);
> + struct resv_map *resv;
> + pgoff_t idx;
>
> - } else if (is_vma_resv_set(vma, HPAGE_RESV_OWNER)) {
> - pgoff_t idx = vma_hugecache_offset(h, vma, addr);
> - struct resv_map *resv = vma_resv_map(vma);
> + resv = vma_resv_map(vma);
> + if (!resv)
> + return;
>
> idx = vma_hugecache_offset(h, vma, addr);
> region_add(resv, idx, idx + 1);
> @@ -2208,7 +2206,7 @@ static void hugetlb_vm_op_open(struct vm_area_struct *vma)
> * after this open call completes. It is therefore safe to take a
> * new reference here without additional locking.
> */
> - if (resv)
> + if (resv && is_vma_resv_set(vma, HPAGE_RESV_OWNER))
> kref_get(&resv->refs);
> }
>
> @@ -2221,7 +2219,10 @@ static void hugetlb_vm_op_close(struct vm_area_struct *vma)
> unsigned long start;
> unsigned long end;
>
> - if (resv) {
> + if (!resv)
> + return;
> +
> + if (is_vma_resv_set(vma, HPAGE_RESV_OWNER)) {
> start = vma_hugecache_offset(h, vma, vma->vm_start);
> end = vma_hugecache_offset(h, vma, vma->vm_end);
>
> @@ -3104,7 +3105,7 @@ int hugetlb_reserve_pages(struct inode *inode,
> * called to make the mapping read-write. Assume !vma is a shm mapping
> */
> if (!vma || vma->vm_flags & VM_MAYSHARE) {
> - resv_map = inode->i_mapping->private_data;
> + resv_map = inode_resv_map(inode);
>
> chg = region_chg(resv_map, from, to);
>
> @@ -3163,7 +3164,7 @@ out_err:
> void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed)
> {
> struct hstate *h = hstate_inode(inode);
> - struct resv_map *resv_map = inode->i_mapping->private_data;
> + struct resv_map *resv_map = inode_resv_map(inode);
> long chg = 0;
> struct hugepage_subpool *spool = subpool_inode(inode);
>
> --
> 1.7.9.5



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