Commit aec6a888 authored by Mel Gorman's avatar Mel Gorman Committed by Linus Torvalds
Browse files

mm, show_mem: remove SHOW_MEM_FILTER_PAGE_COUNT 



Commit 4b59e6c4 ("mm, show_mem: suppress page counts in
non-blockable contexts") introduced SHOW_MEM_FILTER_PAGE_COUNT to
suppress PFN walks on large memory machines.  Commit c78e9363 ("mm:
do not walk all of system memory during show_mem") avoided a PFN walk in
the generic show_mem helper which removes the requirement for
SHOW_MEM_FILTER_PAGE_COUNT in that case.

This patch removes PFN walkers from the arch-specific implementations
that report on a per-node or per-zone granularity.  ARM and unicore32
still do a PFN walk as they report memory usage on each bank which is a
much finer granularity where the debugging information may still be of
use.  As the remaining arches doing PFN walks have relatively small
amounts of memory, this patch simply removes SHOW_MEM_FILTER_PAGE_COUNT.

[akpm@linux-foundation.org: fix parisc]
Signed-off-by: default avatarMel Gorman <mgorman@suse.de>
Acked-by: default avatarDavid Rientjes <rientjes@google.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: James Bottomley <jejb@parisc-linux.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ece86e22

arch/arm/mm/init.c

+0 −3
Original line number Diff line number Diff line
@@ -92,9 +92,6 @@ void show_mem(unsigned int filter) 
	printk("Mem-info:\n");

	show_free_areas(filter);



	if (filter & SHOW_MEM_FILTER_PAGE_COUNT)

		return;



	for_each_bank (i, mi) {

		struct membank *bank = &mi->bank[i];

		unsigned int pfn1, pfn2;

arch/ia64/mm/contig.c

+0 −68
Original line number Diff line number Diff line
@@ -31,74 +31,6 @@ 
static unsigned long max_gap;

#endif



/**

 * show_mem - give short summary of memory stats

 *

 * Shows a simple page count of reserved and used pages in the system.

 * For discontig machines, it does this on a per-pgdat basis.

 */

void show_mem(unsigned int filter)

{

	int i, total_reserved = 0;

	int total_shared = 0, total_cached = 0;

	unsigned long total_present = 0;

	pg_data_t *pgdat;



	printk(KERN_INFO "Mem-info:\n");

	show_free_areas(filter);

	printk(KERN_INFO "Node memory in pages:\n");

	if (filter & SHOW_MEM_FILTER_PAGE_COUNT)

		return;

	for_each_online_pgdat(pgdat) {

		unsigned long present;

		unsigned long flags;

		int shared = 0, cached = 0, reserved = 0;

		int nid = pgdat->node_id;



		if (skip_free_areas_node(filter, nid))

			continue;

		pgdat_resize_lock(pgdat, &flags);

		present = pgdat->node_present_pages;

		for(i = 0; i < pgdat->node_spanned_pages; i++) {

			struct page *page;

			if (unlikely(i % MAX_ORDER_NR_PAGES == 0))

				touch_nmi_watchdog();

			if (pfn_valid(pgdat->node_start_pfn + i))

				page = pfn_to_page(pgdat->node_start_pfn + i);

			else {

#ifdef CONFIG_VIRTUAL_MEM_MAP

				if (max_gap < LARGE_GAP)

					continue;

#endif

				i = vmemmap_find_next_valid_pfn(nid, i) - 1;

				continue;

			}

			if (PageReserved(page))

				reserved++;

			else if (PageSwapCache(page))

				cached++;

			else if (page_count(page))

				shared += page_count(page)-1;

		}

		pgdat_resize_unlock(pgdat, &flags);

		total_present += present;

		total_reserved += reserved;

		total_cached += cached;

		total_shared += shared;

		printk(KERN_INFO "Node %4d:  RAM: %11ld, rsvd: %8d, "

		       "shrd: %10d, swpd: %10d\n", nid,

		       present, reserved, shared, cached);

	}

	printk(KERN_INFO "%ld pages of RAM\n", total_present);

	printk(KERN_INFO "%d reserved pages\n", total_reserved);

	printk(KERN_INFO "%d pages shared\n", total_shared);

	printk(KERN_INFO "%d pages swap cached\n", total_cached);

	printk(KERN_INFO "Total of %ld pages in page table cache\n",

	       quicklist_total_size());

	printk(KERN_INFO "%ld free buffer pages\n", nr_free_buffer_pages());

}





/* physical address where the bootmem map is located */

unsigned long bootmap_start;

arch/ia64/mm/discontig.c

+0 −63
Original line number Diff line number Diff line
@@ -607,69 +607,6 @@ void *per_cpu_init(void) 
}

#endif /* CONFIG_SMP */



/**

 * show_mem - give short summary of memory stats

 *

 * Shows a simple page count of reserved and used pages in the system.

 * For discontig machines, it does this on a per-pgdat basis.

 */

void show_mem(unsigned int filter)

{

	int i, total_reserved = 0;

	int total_shared = 0, total_cached = 0;

	unsigned long total_present = 0;

	pg_data_t *pgdat;



	printk(KERN_INFO "Mem-info:\n");

	show_free_areas(filter);

	if (filter & SHOW_MEM_FILTER_PAGE_COUNT)

		return;

	printk(KERN_INFO "Node memory in pages:\n");

	for_each_online_pgdat(pgdat) {

		unsigned long present;

		unsigned long flags;

		int shared = 0, cached = 0, reserved = 0;

		int nid = pgdat->node_id;



		if (skip_free_areas_node(filter, nid))

			continue;

		pgdat_resize_lock(pgdat, &flags);

		present = pgdat->node_present_pages;

		for(i = 0; i < pgdat->node_spanned_pages; i++) {

			struct page *page;

			if (unlikely(i % MAX_ORDER_NR_PAGES == 0))

				touch_nmi_watchdog();

			if (pfn_valid(pgdat->node_start_pfn + i))

				page = pfn_to_page(pgdat->node_start_pfn + i);

			else {

				i = vmemmap_find_next_valid_pfn(nid, i) - 1;

				continue;

			}

			if (PageReserved(page))

				reserved++;

			else if (PageSwapCache(page))

				cached++;

			else if (page_count(page))

				shared += page_count(page)-1;

		}

		pgdat_resize_unlock(pgdat, &flags);

		total_present += present;

		total_reserved += reserved;

		total_cached += cached;

		total_shared += shared;

		printk(KERN_INFO "Node %4d:  RAM: %11ld, rsvd: %8d, "

		       "shrd: %10d, swpd: %10d\n", nid,

		       present, reserved, shared, cached);

	}

	printk(KERN_INFO "%ld pages of RAM\n", total_present);

	printk(KERN_INFO "%d reserved pages\n", total_reserved);

	printk(KERN_INFO "%d pages shared\n", total_shared);

	printk(KERN_INFO "%d pages swap cached\n", total_cached);

	printk(KERN_INFO "Total of %ld pages in page table cache\n",

	       quicklist_total_size());

	printk(KERN_INFO "%ld free buffer pages\n", nr_free_buffer_pages());

}



/**

 * call_pernode_memory - use SRAT to call callback functions with node info

 * @start: physical start of range

arch/ia64/mm/init.c

+48 −0
Original line number Diff line number Diff line
@@ -684,3 +684,51 @@ per_linux32_init(void) 
}



__initcall(per_linux32_init);



/**

 * show_mem - give short summary of memory stats

 *

 * Shows a simple page count of reserved and used pages in the system.

 * For discontig machines, it does this on a per-pgdat basis.

 */

void show_mem(unsigned int filter)

{

	int total_reserved = 0;

	unsigned long total_present = 0;

	pg_data_t *pgdat;



	printk(KERN_INFO "Mem-info:\n");

	show_free_areas(filter);

	printk(KERN_INFO "Node memory in pages:\n");

	for_each_online_pgdat(pgdat) {

		unsigned long present;

		unsigned long flags;

		int reserved = 0;

		int nid = pgdat->node_id;

		int zoneid;



		if (skip_free_areas_node(filter, nid))

			continue;

		pgdat_resize_lock(pgdat, &flags);



		for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) {

			struct zone *zone = &pgdat->node_zones[zoneid];

			if (!populated_zone(zone))

				continue;



			reserved += zone->present_pages - zone->managed_pages;

		}

		present = pgdat->node_present_pages;



		pgdat_resize_unlock(pgdat, &flags);

		total_present += present;

		total_reserved += reserved;

		printk(KERN_INFO "Node %4d:  RAM: %11ld, rsvd: %8d, ",

		       nid, present, reserved);

	}

	printk(KERN_INFO "%ld pages of RAM\n", total_present);

	printk(KERN_INFO "%d reserved pages\n", total_reserved);

	printk(KERN_INFO "Total of %ld pages in page table cache\n",

	       quicklist_total_size());

	printk(KERN_INFO "%ld free buffer pages\n", nr_free_buffer_pages());

}

arch/parisc/mm/init.c

+17 −42
Original line number Diff line number Diff line
@@ -645,55 +645,30 @@ EXPORT_SYMBOL(empty_zero_page); 


void show_mem(unsigned int filter)

{

	int i,free = 0,total = 0,reserved = 0;

	int shared = 0, cached = 0;

	int total = 0,reserved = 0;

	pg_data_t *pgdat;



	printk(KERN_INFO "Mem-info:\n");

	show_free_areas(filter);

	if (filter & SHOW_MEM_FILTER_PAGE_COUNT)

		return;

#ifndef CONFIG_DISCONTIGMEM

	i = max_mapnr;

	while (i-- > 0) {

		total++;

		if (PageReserved(mem_map+i))

			reserved++;

		else if (PageSwapCache(mem_map+i))

			cached++;

		else if (!page_count(&mem_map[i]))

			free++;

		else

			shared += page_count(&mem_map[i]) - 1;

	}

#else

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

		int j;



		for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {

			struct page *p;

	for_each_online_pgdat(pgdat) {

		unsigned long flags;

		int zoneid;



			pgdat_resize_lock(NODE_DATA(i), &flags);

			p = nid_page_nr(i, j) - node_start_pfn(i);

		pgdat_resize_lock(pgdat, &flags);

		for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) {

			struct zone *zone = &pgdat->node_zones[zoneid];

			if (!populated_zone(zone))

				continue;



			total++;

			if (PageReserved(p))

				reserved++;

			else if (PageSwapCache(p))

				cached++;

			else if (!page_count(p))

				free++;

			else

				shared += page_count(p) - 1;

			pgdat_resize_unlock(NODE_DATA(i), &flags);

			total += zone->present_pages;

			reserved = zone->present_pages - zone->managed_pages;

		}

		pgdat_resize_unlock(pgdat, &flags);

	}

#endif



	printk(KERN_INFO "%d pages of RAM\n", total);

	printk(KERN_INFO "%d reserved pages\n", reserved);

	printk(KERN_INFO "%d pages shared\n", shared);

	printk(KERN_INFO "%d pages swap cached\n", cached);





#ifdef CONFIG_DISCONTIGMEM

	{

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