4b59e6c473
On large systems with a lot of memory, walking all RAM to determine page types may take a half second or even more. In non-blockable contexts, the page allocator will emit a page allocation failure warning unless __GFP_NOWARN is specified. In such contexts, irqs are typically disabled and such a lengthy delay may even result in NMI watchdog timeouts. To fix this, suppress the page walk in such contexts when printing the page allocation failure warning. Signed-off-by: David Rientjes <rientjes@google.com> Cc: Mel Gorman <mgorman@suse.de> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
/*
|
|
* Generic show_mem() implementation
|
|
*
|
|
* Copyright (C) 2008 Johannes Weiner <hannes@saeurebad.de>
|
|
* All code subject to the GPL version 2.
|
|
*/
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/nmi.h>
|
|
#include <linux/quicklist.h>
|
|
|
|
void show_mem(unsigned int filter)
|
|
{
|
|
pg_data_t *pgdat;
|
|
unsigned long total = 0, reserved = 0, shared = 0,
|
|
nonshared = 0, highmem = 0;
|
|
|
|
printk("Mem-Info:\n");
|
|
show_free_areas(filter);
|
|
|
|
if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
|
|
return;
|
|
|
|
for_each_online_pgdat(pgdat) {
|
|
unsigned long i, flags;
|
|
|
|
pgdat_resize_lock(pgdat, &flags);
|
|
for (i = 0; i < pgdat->node_spanned_pages; i++) {
|
|
struct page *page;
|
|
unsigned long pfn = pgdat->node_start_pfn + i;
|
|
|
|
if (unlikely(!(i % MAX_ORDER_NR_PAGES)))
|
|
touch_nmi_watchdog();
|
|
|
|
if (!pfn_valid(pfn))
|
|
continue;
|
|
|
|
page = pfn_to_page(pfn);
|
|
|
|
if (PageHighMem(page))
|
|
highmem++;
|
|
|
|
if (PageReserved(page))
|
|
reserved++;
|
|
else if (page_count(page) == 1)
|
|
nonshared++;
|
|
else if (page_count(page) > 1)
|
|
shared += page_count(page) - 1;
|
|
|
|
total++;
|
|
}
|
|
pgdat_resize_unlock(pgdat, &flags);
|
|
}
|
|
|
|
printk("%lu pages RAM\n", total);
|
|
#ifdef CONFIG_HIGHMEM
|
|
printk("%lu pages HighMem\n", highmem);
|
|
#endif
|
|
printk("%lu pages reserved\n", reserved);
|
|
printk("%lu pages shared\n", shared);
|
|
printk("%lu pages non-shared\n", nonshared);
|
|
#ifdef CONFIG_QUICKLIST
|
|
printk("%lu pages in pagetable cache\n",
|
|
quicklist_total_size());
|
|
#endif
|
|
}
|