Commit e5ff2159 authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
Browse files

hugetlb: multiple hstates for multiple page sizes 



Add basic support for more than one hstate in hugetlbfs.  This is the key
to supporting multiple hugetlbfs page sizes at once.

- Rather than a single hstate, we now have an array, with an iterator
- default_hstate continues to be the struct hstate which we use by default
- Add functions for architectures to register new hstates

[akpm@linux-foundation.org: coding-style fixes]
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 a5516438

include/linux/hugetlb.h

+16 −3
Original line number Diff line number Diff line
@@ -36,8 +36,6 @@ int hugetlb_reserve_pages(struct inode *inode, long from, long to, 
						struct vm_area_struct *vma);

void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);



extern unsigned long max_huge_pages;

extern unsigned long sysctl_overcommit_huge_pages;

extern unsigned long hugepages_treat_as_movable;

extern const unsigned long hugetlb_zero, hugetlb_infinity;

extern int sysctl_hugetlb_shm_group;
@@ -181,7 +179,17 @@ struct hstate { 
	unsigned int surplus_huge_pages_node[MAX_NUMNODES];

};



extern struct hstate default_hstate;

void __init hugetlb_add_hstate(unsigned order);

struct hstate *size_to_hstate(unsigned long size);



#ifndef HUGE_MAX_HSTATE

#define HUGE_MAX_HSTATE 1

#endif



extern struct hstate hstates[HUGE_MAX_HSTATE];

extern unsigned int default_hstate_idx;



#define default_hstate (hstates[default_hstate_idx])



static inline struct hstate *hstate_vma(struct vm_area_struct *vma)

{
@@ -230,6 +238,11 @@ static inline unsigned int blocks_per_huge_page(struct hstate *h) 


#include <asm/hugetlb.h>



static inline struct hstate *page_hstate(struct page *page)

{

	return size_to_hstate(PAGE_SIZE << compound_order(page));

}



#else

struct hstate {};

#define hstate_file(f) NULL

kernel/sysctl.c

+5 −3
Original line number Diff line number Diff line
@@ -959,7 +959,7 @@ static struct ctl_table vm_table[] = { 
#ifdef CONFIG_HUGETLB_PAGE

	 {

		.procname	= "nr_hugepages",

		.data		= &max_huge_pages,

		.data		= NULL,

		.maxlen		= sizeof(unsigned long),

		.mode		= 0644,

		.proc_handler	= &hugetlb_sysctl_handler,
@@ -985,10 +985,12 @@ static struct ctl_table vm_table[] = { 
	{

		.ctl_name	= CTL_UNNUMBERED,

		.procname	= "nr_overcommit_hugepages",

		.data		= &sysctl_overcommit_huge_pages,

		.maxlen		= sizeof(sysctl_overcommit_huge_pages),

		.data		= NULL,

		.maxlen		= sizeof(unsigned long),

		.mode		= 0644,

		.proc_handler	= &hugetlb_overcommit_handler,

		.extra1		= (void *)&hugetlb_zero,

		.extra2		= (void *)&hugetlb_infinity,

	},

#endif

	{

mm/hugetlb.c

+121 −27
Original line number Diff line number Diff line
@@ -22,12 +22,19 @@ 
#include "internal.h"



const unsigned long hugetlb_zero = 0, hugetlb_infinity = ~0UL;

unsigned long max_huge_pages;

unsigned long sysctl_overcommit_huge_pages;

static gfp_t htlb_alloc_mask = GFP_HIGHUSER;

unsigned long hugepages_treat_as_movable;



struct hstate default_hstate;

static int max_hstate;

unsigned int default_hstate_idx;

struct hstate hstates[HUGE_MAX_HSTATE];



/* for command line parsing */

static struct hstate * __initdata parsed_hstate;

static unsigned long __initdata default_hstate_max_huge_pages;



#define for_each_hstate(h) \

	for ((h) = hstates; (h) < &hstates[max_hstate]; (h)++)



/*

 * Protects updates to hugepage_freelists, nr_huge_pages, and free_huge_pages
@@ -454,13 +461,24 @@ static void update_and_free_page(struct hstate *h, struct page *page) 
	__free_pages(page, huge_page_order(h));

}



struct hstate *size_to_hstate(unsigned long size)

{

	struct hstate *h;



	for_each_hstate(h) {

		if (huge_page_size(h) == size)

			return h;

	}

	return NULL;

}



static void free_huge_page(struct page *page)

{

	/*

	 * Can't pass hstate in here because it is called from the

	 * compound page destructor.

	 */

	struct hstate *h = &default_hstate;

	struct hstate *h = page_hstate(page);

	int nid = page_to_nid(page);

	struct address_space *mapping;
@@ -887,39 +905,94 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma, 
	return page;

}



static int __init hugetlb_init(void)

static void __init hugetlb_init_one_hstate(struct hstate *h)

{

	unsigned long i;

	struct hstate *h = &default_hstate;



	if (HPAGE_SHIFT == 0)

		return 0;



	if (!h->order) {

		h->order = HPAGE_SHIFT - PAGE_SHIFT;

		h->mask = HPAGE_MASK;

	}



	for (i = 0; i < MAX_NUMNODES; ++i)

		INIT_LIST_HEAD(&h->hugepage_freelists[i]);



	h->hugetlb_next_nid = first_node(node_online_map);



	for (i = 0; i < max_huge_pages; ++i) {

	for (i = 0; i < h->max_huge_pages; ++i) {

		if (!alloc_fresh_huge_page(h))

			break;

	}

	max_huge_pages = h->free_huge_pages = h->nr_huge_pages = i;

	printk(KERN_INFO "Total HugeTLB memory allocated, %ld\n",

			h->free_huge_pages);

	h->max_huge_pages = h->free_huge_pages = h->nr_huge_pages = i;

}



static void __init hugetlb_init_hstates(void)

{

	struct hstate *h;



	for_each_hstate(h) {

		hugetlb_init_one_hstate(h);

	}

}



static void __init report_hugepages(void)

{

	struct hstate *h;



	for_each_hstate(h) {

		printk(KERN_INFO "Total HugeTLB memory allocated, "

				"%ld %dMB pages\n",

				h->free_huge_pages,

				1 << (h->order + PAGE_SHIFT - 20));

	}

}



static int __init hugetlb_init(void)

{

	BUILD_BUG_ON(HPAGE_SHIFT == 0);



	if (!size_to_hstate(HPAGE_SIZE)) {

		hugetlb_add_hstate(HUGETLB_PAGE_ORDER);

		parsed_hstate->max_huge_pages = default_hstate_max_huge_pages;

	}

	default_hstate_idx = size_to_hstate(HPAGE_SIZE) - hstates;



	hugetlb_init_hstates();



	report_hugepages();



	return 0;

}

module_init(hugetlb_init);



/* Should be called on processing a hugepagesz=... option */

void __init hugetlb_add_hstate(unsigned order)

{

	struct hstate *h;

	if (size_to_hstate(PAGE_SIZE << order)) {

		printk(KERN_WARNING "hugepagesz= specified twice, ignoring\n");

		return;

	}

	BUG_ON(max_hstate >= HUGE_MAX_HSTATE);

	BUG_ON(order == 0);

	h = &hstates[max_hstate++];

	h->order = order;

	h->mask = ~((1ULL << (order + PAGE_SHIFT)) - 1);

	hugetlb_init_one_hstate(h);

	parsed_hstate = h;

}



static int __init hugetlb_setup(char *s)

{

	if (sscanf(s, "%lu", &max_huge_pages) <= 0)

		max_huge_pages = 0;

	unsigned long *mhp;



	/*

	 * !max_hstate means we haven't parsed a hugepagesz= parameter yet,

	 * so this hugepages= parameter goes to the "default hstate".

	 */

	if (!max_hstate)

		mhp = &default_hstate_max_huge_pages;

	else

		mhp = &parsed_hstate->max_huge_pages;



	if (sscanf(s, "%lu", mhp) <= 0)

		*mhp = 0;



	return 1;

}

__setup("hugepages=", hugetlb_setup);
@@ -950,7 +1023,7 @@ static void try_to_free_low(struct hstate *h, unsigned long count) 
			if (PageHighMem(page))

				continue;

			list_del(&page->lru);

			update_and_free_page(page);

			update_and_free_page(h, page);

			h->free_huge_pages--;

			h->free_huge_pages_node[page_to_nid(page)]--;

		}
@@ -963,10 +1036,9 @@ static inline void try_to_free_low(struct hstate *h, unsigned long count) 
#endif



#define persistent_huge_pages(h) (h->nr_huge_pages - h->surplus_huge_pages)

static unsigned long set_max_huge_pages(unsigned long count)

static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count)

{

	unsigned long min_count, ret;

	struct hstate *h = &default_hstate;



	/*

	 * Increase the pool size
@@ -1037,8 +1109,19 @@ int hugetlb_sysctl_handler(struct ctl_table *table, int write, 
			   struct file *file, void __user *buffer,

			   size_t *length, loff_t *ppos)

{

	struct hstate *h = &default_hstate;

	unsigned long tmp;



	if (!write)

		tmp = h->max_huge_pages;



	table->data = &tmp;

	table->maxlen = sizeof(unsigned long);

	proc_doulongvec_minmax(table, write, file, buffer, length, ppos);

	max_huge_pages = set_max_huge_pages(max_huge_pages);



	if (write)

		h->max_huge_pages = set_max_huge_pages(h, tmp);



	return 0;

}
@@ -1059,10 +1142,21 @@ int hugetlb_overcommit_handler(struct ctl_table *table, int write, 
			size_t *length, loff_t *ppos)

{

	struct hstate *h = &default_hstate;

	unsigned long tmp;



	if (!write)

		tmp = h->nr_overcommit_huge_pages;



	table->data = &tmp;

	table->maxlen = sizeof(unsigned long);

	proc_doulongvec_minmax(table, write, file, buffer, length, ppos);



	if (write) {

		spin_lock(&hugetlb_lock);

	h->nr_overcommit_huge_pages = sysctl_overcommit_huge_pages;

		h->nr_overcommit_huge_pages = tmp;

		spin_unlock(&hugetlb_lock);

	}



	return 0;

}

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