Commit a137e1cc authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
Browse files

hugetlbfs: per mount huge page sizes 



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: default avatarAdam Litke <agl@us.ibm.com>
Acked-by: default avatarNishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e5ff2159

fs/hugetlbfs/inode.c

+36 −9
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ int sysctl_hugetlb_shm_group; 
enum {

	Opt_size, Opt_nr_inodes,

	Opt_mode, Opt_uid, Opt_gid,

	Opt_pagesize,

	Opt_err,

};
@@ -62,6 +63,7 @@ static match_table_t tokens = { 
	{Opt_mode,	"mode=%o"},

	{Opt_uid,	"uid=%u"},

	{Opt_gid,	"gid=%u"},

	{Opt_pagesize,	"pagesize=%s"},

	{Opt_err,	NULL},

};
@@ -750,6 +752,8 @@ hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) 
	char *p, *rest;

	substring_t args[MAX_OPT_ARGS];

	int option;

	unsigned long long size = 0;

	enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE;



	if (!options)

		return 0;
@@ -780,17 +784,13 @@ hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) 
			break;



		case Opt_size: {

 			unsigned long long size;

			/* memparse() will accept a K/M/G without a digit */

			if (!isdigit(*args[0].from))

				goto bad_val;

			size = memparse(args[0].from, &rest);

			if (*rest == '%') {

				size <<= HPAGE_SHIFT;

				size *= max_huge_pages;

				do_div(size, 100);

			}

			pconfig->nr_blocks = (size >> HPAGE_SHIFT);

			setsize = SIZE_STD;

			if (*rest == '%')

				setsize = SIZE_PERCENT;

			break;

		}
@@ -801,6 +801,19 @@ hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) 
			pconfig->nr_inodes = memparse(args[0].from, &rest);

			break;



		case Opt_pagesize: {

			unsigned long ps;

			ps = memparse(args[0].from, &rest);

			pconfig->hstate = size_to_hstate(ps);

			if (!pconfig->hstate) {

				printk(KERN_ERR

				"hugetlbfs: Unsupported page size %lu MB\n",

					ps >> 20);

				return -EINVAL;

			}

			break;

		}



		default:

			printk(KERN_ERR "hugetlbfs: Bad mount option: \"%s\"\n",

				 p);
@@ -808,6 +821,18 @@ hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) 
			break;

		}

	}



	/* Do size after hstate is set up */

	if (setsize > NO_SIZE) {

		struct hstate *h = pconfig->hstate;

		if (setsize == SIZE_PERCENT) {

			size <<= huge_page_shift(h);

			size *= h->max_huge_pages;

			do_div(size, 100);

		}

		pconfig->nr_blocks = (size >> huge_page_shift(h));

	}



	return 0;



bad_val:
@@ -832,6 +857,7 @@ hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) 
	config.uid = current->fsuid;

	config.gid = current->fsgid;

	config.mode = 0755;

	config.hstate = &default_hstate;

	ret = hugetlbfs_parse_options(data, &config);

	if (ret)

		return ret;
@@ -840,14 +866,15 @@ hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) 
	if (!sbinfo)

		return -ENOMEM;

	sb->s_fs_info = sbinfo;

	sbinfo->hstate = config.hstate;

	spin_lock_init(&sbinfo->stat_lock);

	sbinfo->max_blocks = config.nr_blocks;

	sbinfo->free_blocks = config.nr_blocks;

	sbinfo->max_inodes = config.nr_inodes;

	sbinfo->free_inodes = config.nr_inodes;

	sb->s_maxbytes = MAX_LFS_FILESIZE;

	sb->s_blocksize = HPAGE_SIZE;

	sb->s_blocksize_bits = HPAGE_SHIFT;

	sb->s_blocksize = huge_page_size(config.hstate);

	sb->s_blocksize_bits = huge_page_shift(config.hstate);

	sb->s_magic = HUGETLBFS_MAGIC;

	sb->s_op = &hugetlbfs_ops;

	sb->s_time_gran = 1;

include/linux/hugetlb.h

+9 −5
Original line number Diff line number Diff line
@@ -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)

mm/hugetlb.c

+3 −13
Original line number Diff line number Diff line
@@ -1439,20 +1439,10 @@ void __unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, 
void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,

			  unsigned long end, struct page *ref_page)

{

	/*

	 * It is undesirable to test vma->vm_file as it should be non-null

	 * for valid hugetlb area. However, vm_file will be NULL in the error

	 * cleanup path of do_mmap_pgoff. When hugetlbfs ->mmap method fails,

	 * do_mmap_pgoff() nullifies vma->vm_file before calling this function

	 * to clean up. Since no pte has actually been setup, it is safe to

	 * do nothing in this case.

	 */

	if (vma->vm_file) {

	spin_lock(&vma->vm_file->f_mapping->i_mmap_lock);

	__unmap_hugepage_range(vma, start, end, ref_page);

	spin_unlock(&vma->vm_file->f_mapping->i_mmap_lock);

}

}



/*

 * This is called when the original mapper is failing to COW a MAP_PRIVATE

mm/memory.c

+16 −2
Original line number Diff line number Diff line
@@ -901,9 +901,23 @@ unsigned long unmap_vmas(struct mmu_gather **tlbp, 
			}



			if (unlikely(is_vm_hugetlb_page(vma))) {

				/*

				 * It is undesirable to test vma->vm_file as it

				 * should be non-null for valid hugetlb area.

				 * However, vm_file will be NULL in the error

				 * cleanup path of do_mmap_pgoff. When

				 * hugetlbfs ->mmap method fails,

				 * do_mmap_pgoff() nullifies vma->vm_file

				 * before calling this function to clean up.

				 * Since no pte has actually been setup, it is

				 * safe to do nothing in this case.

				 */

				if (vma->vm_file) {

					unmap_hugepage_range(vma, start, end, NULL);

					zap_work -= (end - start) /

					pages_per_huge_page(hstate_vma(vma));

				}



				start = end;

			} else

				start = unmap_page_range(*tlbp, vma,

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