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hugetlbfs: per mount huge page sizes

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Add the ability to configure the hugetlb hstate used on a per mount basis.

- Add a new pagesize= option to the hugetlbfs mount that allows setting
  the page size
- This option causes the mount code to find the hstate corresponding to the
  specified size, and sets up a pointer to the hstate in the mount's
  superblock.
- Change the hstate accessors to use this information rather than the
  global_hstate they were using (requires a slight change in mm/memory.c
  so we don't NULL deref in the error-unmap path -- see comments).

[np: take hstate out of hugetlbfs inode and vma->vm_private_data]

Acked-by: Adam Litke <agl@us.ibm.com>
Acked-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andi Kleen 2008-07-23 21:27:43 -07:00 • committed by Linus Torvalds
parent e5ff215941
commit a137e1cc6d
4 changed files with 64 additions and 29 deletions
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14
include/linux/hugetlb.h
View file

@ -100,6 +100,7 @@ struct hugetlbfs_config {
umode_t mode;
long nr_blocks;
long nr_inodes;
struct hstate *hstate;
};
struct hugetlbfs_sb_info {
@ -108,6 +109,7 @@ struct hugetlbfs_sb_info {
long max_inodes; /* inodes allowed */
long free_inodes; /* inodes free */
spinlock_t stat_lock;
struct hstate *hstate;
};
@ -191,19 +193,21 @@ extern unsigned int default_hstate_idx;
#define default_hstate (hstates[default_hstate_idx])
static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
static inline struct hstate *hstate_inode(struct inode *i)
{
return &default_hstate;
struct hugetlbfs_sb_info *hsb;
hsb = HUGETLBFS_SB(i->i_sb);
return hsb->hstate;
}
static inline struct hstate *hstate_file(struct file *f)
{
return &default_hstate;
return hstate_inode(f->f_dentry->d_inode);
}
static inline struct hstate *hstate_inode(struct inode *i)
static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
{
return &default_hstate;
return hstate_file(vma->vm_file);
}
static inline unsigned long huge_page_size(struct hstate *h)