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Commit e44e41d0 authored by Bob Picco's avatar Bob Picco Committed by Tony Luck
Browse files

[IA64] fix show_mem for VIRTUAL_MEM_MAP+FLATMEM 



contig.c (FLATMEM) requires the same optimization as in discontig.c for show_mem
when VIRTUAL_MEM_MAP is in use. Otherwise FLATMEM has softlockup timeouts.
This was boot tested for memory configuration: SPARSEMEM,
DISCONTIG+VIRTUAL_MEM_MAP, FLATMEM, FLATMEM+VIRTUAL_MEM_MAP and
FLATMEM+VIRTUAL_MEM_MAP with largest memory gap less than LARGE_GAP by
using boot parameter "mem=".

This was boot tested and "echo m >/proc/sysrq-trigger" output evaluated for
: FLATMEM, FLATMEM+VIRTUAL_MEM_MAP, DISCONTIGMEM+VIRTUAL_MEM_MAP and
SPARSEMEM.

Signed-off-by: default avatarBob Picco <bob.picco@hp.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent 921eea1c

arch/ia64/mm/contig.c

+9 −4
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 


#ifdef CONFIG_VIRTUAL_MEM_MAP

static unsigned long num_dma_physpages;

static unsigned long max_gap;

#endif



/**
@@ -45,9 +46,15 @@ show_mem (void) 


	printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));

	i = max_mapnr;

	while (i-- > 0) {

		if (!pfn_valid(i))

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

		if (!pfn_valid(i)) {

#ifdef CONFIG_VIRTUAL_MEM_MAP

			if (max_gap < LARGE_GAP)

				continue;

			i = vmemmap_find_next_valid_pfn(0, i) - 1;

#endif

			continue;

		}

		total++;

		if (PageReserved(mem_map+i))

			reserved++;
@@ -234,7 +241,6 @@ paging_init (void) 
	unsigned long zones_size[MAX_NR_ZONES];

#ifdef CONFIG_VIRTUAL_MEM_MAP

	unsigned long zholes_size[MAX_NR_ZONES];

	unsigned long max_gap;

#endif



	/* initialize mem_map[] */
@@ -266,7 +272,6 @@ paging_init (void) 
		}

	}



	max_gap = 0;

	efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);

	if (max_gap < LARGE_GAP) {

		vmem_map = (struct page *) 0;

arch/ia64/mm/discontig.c

+2 −63
Original line number Diff line number Diff line
@@ -534,68 +534,6 @@ void __cpuinit *per_cpu_init(void) 
}

#endif /* CONFIG_SMP */



#ifdef CONFIG_VIRTUAL_MEM_MAP

static inline int find_next_valid_pfn_for_pgdat(pg_data_t *pgdat, int i)

{

	unsigned long end_address, hole_next_pfn;

	unsigned long stop_address;



	end_address = (unsigned long) &vmem_map[pgdat->node_start_pfn + i];

	end_address = PAGE_ALIGN(end_address);



	stop_address = (unsigned long) &vmem_map[

		pgdat->node_start_pfn + pgdat->node_spanned_pages];



	do {

		pgd_t *pgd;

		pud_t *pud;

		pmd_t *pmd;

		pte_t *pte;



		pgd = pgd_offset_k(end_address);

		if (pgd_none(*pgd)) {

			end_address += PGDIR_SIZE;

			continue;

		}



		pud = pud_offset(pgd, end_address);

		if (pud_none(*pud)) {

			end_address += PUD_SIZE;

			continue;

		}



		pmd = pmd_offset(pud, end_address);

		if (pmd_none(*pmd)) {

			end_address += PMD_SIZE;

			continue;

		}



		pte = pte_offset_kernel(pmd, end_address);

retry_pte:

		if (pte_none(*pte)) {

			end_address += PAGE_SIZE;

			pte++;

			if ((end_address < stop_address) &&

			    (end_address != ALIGN(end_address, 1UL << PMD_SHIFT)))

				goto retry_pte;

			continue;

		}

		/* Found next valid vmem_map page */

		break;

	} while (end_address < stop_address);



	end_address = min(end_address, stop_address);

	end_address = end_address - (unsigned long) vmem_map + sizeof(struct page) - 1;

	hole_next_pfn = end_address / sizeof(struct page);

	return hole_next_pfn - pgdat->node_start_pfn;

}

#else

static inline int find_next_valid_pfn_for_pgdat(pg_data_t *pgdat, int i)

{

	return i + 1;

}

#endif



/**

 * show_mem - give short summary of memory stats

 *
@@ -625,7 +563,8 @@ void show_mem(void) 
			if (pfn_valid(pgdat->node_start_pfn + i))

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

			else {

				i = find_next_valid_pfn_for_pgdat(pgdat, i) - 1;

				i = vmemmap_find_next_valid_pfn(pgdat->node_id,

					 i) - 1;

				continue;

			}

			if (PageReserved(page))

arch/ia64/mm/init.c

+55 −0
Original line number Diff line number Diff line
@@ -415,6 +415,61 @@ ia64_mmu_init (void *my_cpu_data) 
}



#ifdef CONFIG_VIRTUAL_MEM_MAP

int vmemmap_find_next_valid_pfn(int node, int i)

{

	unsigned long end_address, hole_next_pfn;

	unsigned long stop_address;

	pg_data_t *pgdat = NODE_DATA(node);



	end_address = (unsigned long) &vmem_map[pgdat->node_start_pfn + i];

	end_address = PAGE_ALIGN(end_address);



	stop_address = (unsigned long) &vmem_map[

		pgdat->node_start_pfn + pgdat->node_spanned_pages];



	do {

		pgd_t *pgd;

		pud_t *pud;

		pmd_t *pmd;

		pte_t *pte;



		pgd = pgd_offset_k(end_address);

		if (pgd_none(*pgd)) {

			end_address += PGDIR_SIZE;

			continue;

		}



		pud = pud_offset(pgd, end_address);

		if (pud_none(*pud)) {

			end_address += PUD_SIZE;

			continue;

		}



		pmd = pmd_offset(pud, end_address);

		if (pmd_none(*pmd)) {

			end_address += PMD_SIZE;

			continue;

		}



		pte = pte_offset_kernel(pmd, end_address);

retry_pte:

		if (pte_none(*pte)) {

			end_address += PAGE_SIZE;

			pte++;

			if ((end_address < stop_address) &&

			    (end_address != ALIGN(end_address, 1UL << PMD_SHIFT)))

				goto retry_pte;

			continue;

		}

		/* Found next valid vmem_map page */

		break;

	} while (end_address < stop_address);



	end_address = min(end_address, stop_address);

	end_address = end_address - (unsigned long) vmem_map + sizeof(struct page) - 1;

	hole_next_pfn = end_address / sizeof(struct page);

	return hole_next_pfn - pgdat->node_start_pfn;

}



int __init

create_mem_map_page_table (u64 start, u64 end, void *arg)

include/asm-ia64/meminit.h

+6 −1
Original line number Diff line number Diff line
@@ -56,6 +56,11 @@ extern void efi_memmap_init(unsigned long *, unsigned long *); 
  extern struct page *vmem_map;

  extern int find_largest_hole (u64 start, u64 end, void *arg);

  extern int create_mem_map_page_table (u64 start, u64 end, void *arg);

  extern int vmemmap_find_next_valid_pfn(int, int);

#else

static inline int vmemmap_find_next_valid_pfn(int node, int i)

{

	return i + 1;

}

#endif



#endif /* meminit_h */