Commit a74609fa authored by Nick Piggin's avatar Nick Piggin Committed by Linus Torvalds
Browse files

[PATCH] mm: page_state opt 



Optimise page_state manipulations by introducing interrupt unsafe accessors
to page_state fields.  Callers must provide their own locking (either
disable interrupts or not update from interrupt context).

Switch over the hot callsites that can easily be moved under interrupts off
sections.

Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent d3cb4871

include/linux/page-flags.h

+32 −11
Original line number Diff line number Diff line
@@ -144,22 +144,33 @@ struct page_state { 
extern void get_page_state(struct page_state *ret);

extern void get_page_state_node(struct page_state *ret, int node);

extern void get_full_page_state(struct page_state *ret);

extern unsigned long __read_page_state(unsigned long offset);

extern void __mod_page_state(unsigned long offset, unsigned long delta);

extern unsigned long read_page_state_offset(unsigned long offset);

extern void mod_page_state_offset(unsigned long offset, unsigned long delta);

extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);



#define read_page_state(member) \

	__read_page_state(offsetof(struct page_state, member))

	read_page_state_offset(offsetof(struct page_state, member))



#define mod_page_state(member, delta)	\

	__mod_page_state(offsetof(struct page_state, member), (delta))

	mod_page_state_offset(offsetof(struct page_state, member), (delta))



#define __mod_page_state(member, delta)	\

	__mod_page_state_offset(offsetof(struct page_state, member), (delta))



#define inc_page_state(member)		mod_page_state(member, 1UL)

#define dec_page_state(member)		mod_page_state(member, 0UL - 1)

#define add_page_state(member,delta)	mod_page_state(member, (delta))

#define sub_page_state(member,delta)	mod_page_state(member, 0UL - (delta))



#define mod_page_state_zone(zone, member, delta)			\

 do {									\

#define __inc_page_state(member)	__mod_page_state(member, 1UL)

#define __dec_page_state(member)	__mod_page_state(member, 0UL - 1)

#define __add_page_state(member,delta)	__mod_page_state(member, (delta))

#define __sub_page_state(member,delta)	__mod_page_state(member, 0UL - (delta))



#define page_state(member) (*__page_state(offsetof(struct page_state, member)))



#define state_zone_offset(zone, member)					\

({									\

	unsigned offset;						\

	if (is_highmem(zone))						\

		offset = offsetof(struct page_state, member##_high);	\
@@ -169,7 +180,17 @@ extern void __mod_page_state(unsigned long offset, unsigned long delta); 
		offset = offsetof(struct page_state, member##_dma32);	\

	else								\

		offset = offsetof(struct page_state, member##_dma);	\

	__mod_page_state(offset, (delta));				\

	offset;								\

})



#define __mod_page_state_zone(zone, member, delta)			\

 do {									\

	__mod_page_state_offset(state_zone_offset(zone, member), (delta)); \

 } while (0)



#define mod_page_state_zone(zone, member, delta)			\

 do {									\

	mod_page_state_offset(state_zone_offset(zone, member), (delta)); \

 } while (0)



/*

mm/page_alloc.c

+50 −39
Original line number Diff line number Diff line
@@ -424,9 +424,9 @@ void __free_pages_ok(struct page *page, unsigned int order) 
		return;



	list_add(&page->lru, &list);

	mod_page_state(pgfree, 1 << order);

	kernel_map_pages(page, 1<<order, 0);

	local_irq_save(flags);

	__mod_page_state(pgfree, 1 << order);

	free_pages_bulk(page_zone(page), 1, &list, order);

	local_irq_restore(flags);

}
@@ -674,17 +674,13 @@ void drain_local_pages(void) 
}

#endif /* CONFIG_PM */



static void zone_statistics(struct zonelist *zonelist, struct zone *z)

static void zone_statistics(struct zonelist *zonelist, struct zone *z, int cpu)

{

#ifdef CONFIG_NUMA

	unsigned long flags;

	int cpu;

	pg_data_t *pg = z->zone_pgdat;

	pg_data_t *orig = zonelist->zones[0]->zone_pgdat;

	struct per_cpu_pageset *p;



	local_irq_save(flags);

	cpu = smp_processor_id();

	p = zone_pcp(z, cpu);

	if (pg == orig) {

		p->numa_hit++;
@@ -696,7 +692,6 @@ static void zone_statistics(struct zonelist *zonelist, struct zone *z) 
		p->local_node++;

	else

		p->other_node++;

	local_irq_restore(flags);

#endif

}
@@ -716,11 +711,11 @@ static void fastcall free_hot_cold_page(struct page *page, int cold) 
	if (free_pages_check(page))

		return;



	inc_page_state(pgfree);

	kernel_map_pages(page, 1, 0);



	pcp = &zone_pcp(zone, get_cpu())->pcp[cold];

	local_irq_save(flags);

	__inc_page_state(pgfree);

	list_add(&page->lru, &pcp->list);

	pcp->count++;

	if (pcp->count >= pcp->high)
@@ -753,39 +748,44 @@ static inline void prep_zero_page(struct page *page, int order, gfp_t gfp_flags) 
 * we cheat by calling it from here, in the order > 0 path.  Saves a branch

 * or two.

 */

static struct page *

buffered_rmqueue(struct zone *zone, int order, gfp_t gfp_flags)

static struct page *buffered_rmqueue(struct zonelist *zonelist,

			struct zone *zone, int order, gfp_t gfp_flags)

{

	unsigned long flags;

	struct page *page;

	int cold = !!(gfp_flags & __GFP_COLD);

	int cpu;



again:

	cpu  = get_cpu();

	if (order == 0) {

		struct per_cpu_pages *pcp;



		page = NULL;

		pcp = &zone_pcp(zone, get_cpu())->pcp[cold];

		pcp = &zone_pcp(zone, cpu)->pcp[cold];

		local_irq_save(flags);

		if (!pcp->count)

		if (!pcp->count) {

			pcp->count += rmqueue_bulk(zone, 0,

						pcp->batch, &pcp->list);

		if (likely(pcp->count)) {

			if (unlikely(!pcp->count))

				goto failed;

		}

		page = list_entry(pcp->list.next, struct page, lru);

		list_del(&page->lru);

		pcp->count--;

		}

		local_irq_restore(flags);

		put_cpu();

	} else {

		spin_lock_irqsave(&zone->lock, flags);

		page = __rmqueue(zone, order);

		spin_unlock_irqrestore(&zone->lock, flags);

		spin_unlock(&zone->lock);

		if (!page)

			goto failed;

	}



	if (page != NULL) {

	__mod_page_state_zone(zone, pgalloc, 1 << order);

	zone_statistics(zonelist, zone, cpu);

	local_irq_restore(flags);

	put_cpu();



	BUG_ON(bad_range(zone, page));

		mod_page_state_zone(zone, pgalloc, 1 << order);

	if (prep_new_page(page, order))

		goto again;
@@ -794,8 +794,12 @@ again: 


	if (order && (gfp_flags & __GFP_COMP))

		prep_compound_page(page, order);

	}

	return page;



failed:

	local_irq_restore(flags);

	put_cpu();

	return NULL;

}



#define ALLOC_NO_WATERMARKS	0x01 /* don't check watermarks at all */
@@ -871,9 +875,8 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order, 
				continue;

		}



		page = buffered_rmqueue(*z, order, gfp_mask);

		page = buffered_rmqueue(zonelist, *z, order, gfp_mask);

		if (page) {

			zone_statistics(zonelist, *z);

			break;

		}

	} while (*(++z) != NULL);
@@ -1248,7 +1251,7 @@ void get_full_page_state(struct page_state *ret) 
	__get_page_state(ret, sizeof(*ret) / sizeof(unsigned long), &mask);

}



unsigned long __read_page_state(unsigned long offset)

unsigned long read_page_state_offset(unsigned long offset)

{

	unsigned long ret = 0;

	int cpu;
@@ -1262,7 +1265,16 @@ unsigned long __read_page_state(unsigned long offset) 
	return ret;

}



void __mod_page_state(unsigned long offset, unsigned long delta)

void __mod_page_state_offset(unsigned long offset, unsigned long delta)

{

	void *ptr;



	ptr = &__get_cpu_var(page_states);

	*(unsigned long *)(ptr + offset) += delta;

}

EXPORT_SYMBOL(__mod_page_state_offset);



void mod_page_state_offset(unsigned long offset, unsigned long delta)

{

	unsigned long flags;

	void *ptr;
@@ -1272,8 +1284,7 @@ void __mod_page_state(unsigned long offset, unsigned long delta) 
	*(unsigned long *)(ptr + offset) += delta;

	local_irq_restore(flags);

}



EXPORT_SYMBOL(__mod_page_state);

EXPORT_SYMBOL(mod_page_state_offset);



void __get_zone_counts(unsigned long *active, unsigned long *inactive,

			unsigned long *free, struct pglist_data *pgdat)

mm/rmap.c

+7 −3
Original line number Diff line number Diff line
@@ -451,7 +451,11 @@ static void __page_set_anon_rmap(struct page *page, 


	page->index = linear_page_index(vma, address);



	inc_page_state(nr_mapped);

	/*

	 * nr_mapped state can be updated without turning off

	 * interrupts because it is not modified via interrupt.

	 */

	__inc_page_state(nr_mapped);

}



/**
@@ -498,7 +502,7 @@ void page_add_file_rmap(struct page *page) 
	BUG_ON(!pfn_valid(page_to_pfn(page)));



	if (atomic_inc_and_test(&page->_mapcount))

		inc_page_state(nr_mapped);

		__inc_page_state(nr_mapped);

}



/**
@@ -522,7 +526,7 @@ void page_remove_rmap(struct page *page) 
		 */

		if (page_test_and_clear_dirty(page))

			set_page_dirty(page);

		dec_page_state(nr_mapped);

		__dec_page_state(nr_mapped);

	}

}

mm/vmscan.c

+15 −12
Original line number Diff line number Diff line
@@ -645,16 +645,17 @@ static void shrink_cache(struct zone *zone, struct scan_control *sc) 
			goto done;



		max_scan -= nr_scan;

		if (current_is_kswapd())

			mod_page_state_zone(zone, pgscan_kswapd, nr_scan);

		else

			mod_page_state_zone(zone, pgscan_direct, nr_scan);

		nr_freed = shrink_list(&page_list, sc);

		if (current_is_kswapd())

			mod_page_state(kswapd_steal, nr_freed);

		mod_page_state_zone(zone, pgsteal, nr_freed);



		spin_lock_irq(&zone->lru_lock);

		local_irq_disable();

		if (current_is_kswapd()) {

			__mod_page_state_zone(zone, pgscan_kswapd, nr_scan);

			__mod_page_state(kswapd_steal, nr_freed);

		} else

			__mod_page_state_zone(zone, pgscan_direct, nr_scan);

		__mod_page_state_zone(zone, pgsteal, nr_freed);



		spin_lock(&zone->lru_lock);

		/*

		 * Put back any unfreeable pages.

		 */
@@ -816,11 +817,13 @@ refill_inactive_zone(struct zone *zone, struct scan_control *sc) 
		}

	}

	zone->nr_active += pgmoved;

	spin_unlock_irq(&zone->lru_lock);

	pagevec_release(&pvec);

	spin_unlock(&zone->lru_lock);



	mod_page_state_zone(zone, pgrefill, pgscanned);

	mod_page_state(pgdeactivate, pgdeactivate);

	__mod_page_state_zone(zone, pgrefill, pgscanned);

	__mod_page_state(pgdeactivate, pgdeactivate);

	local_irq_enable();



	pagevec_release(&pvec);

}



/*

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