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mm, show_mem: remove SHOW_MEM_FILTER_PAGE_COUNT 

Commit 4b59e6c473 ("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 c78e93630d ("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: Mel Gorman <mgorman@suse.de>
Acked-by: David 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2014-01-21 15:49:13 -08:00 committed by Linus Torvalds
parent ece86e222d
commit aec6a8889a
9 changed files with 65 additions and 190 deletions
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3
arch/arm/mm/init.c
View File

@ -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;

68
arch/ia64/mm/contig.c
View File

@ -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;

63
arch/ia64/mm/discontig.c
View File

@ -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

48
arch/ia64/mm/init.c
View File

@ -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());
}

59
arch/parisc/mm/init.c
View File

@ -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;
for_each_online_pgdat(pgdat) {
unsigned long flags;
int zoneid;
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 += zone->present_pages;
reserved = zone->present_pages - zone->managed_pages;
}
pgdat_resize_unlock(pgdat, &flags);
}
#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;
unsigned long flags;
pgdat_resize_lock(NODE_DATA(i), &flags);
p = nid_page_nr(i, j) - node_start_pfn(i);
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);
}
}
#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
{

3
arch/unicore32/mm/init.c
View File

@ -66,9 +66,6 @@ void show_mem(unsigned int filter)
printk(KERN_DEFAULT "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;

1
include/linux/mm.h
View File

@ -1016,7 +1016,6 @@ extern void pagefault_out_of_memory(void);
* various contexts.
*/
#define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
#define SHOW_MEM_FILTER_PAGE_COUNT (0x0002u) /* page type count */
extern void show_free_areas(unsigned int flags);
extern bool skip_free_areas_node(unsigned int flags, int nid);

3
lib/show_mem.c
View File

@ -17,9 +17,6 @@ void show_mem(unsigned int filter)
printk("Mem-Info:\n");
show_free_areas(filter);
if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
return;
for_each_online_pgdat(pgdat) {
unsigned long flags;
int zoneid;

7
mm/page_alloc.c
View File

@ -2071,13 +2071,6 @@ void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...)
debug_guardpage_minorder() > 0)
return;
/*
* Walking all memory to count page types is very expensive and should
* be inhibited in non-blockable contexts.
*/
if (!(gfp_mask & __GFP_WAIT))
filter |= SHOW_MEM_FILTER_PAGE_COUNT;
/*
* This documents exceptions given to allocations in certain
* contexts that are allowed to allocate outside current's set