[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: Bob Picco <bob.picco@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

diff --git a/arch/ia64/mm/contig.c b/arch/ia64/mm/contig.c
index 8919fed..e004143 100644 (file)
--- a/arch/ia64/mm/contig.c
+++ b/arch/ia64/mm/contig.c
@@ -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;

diff --git a/arch/ia64/mm/discontig.c b/arch/ia64/mm/discontig.c
index 8eeb669..d260bff 100644 (file)
--- a/arch/ia64/mm/discontig.c
+++ b/arch/ia64/mm/discontig.c
@@ -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))

diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 2f50c06..30617cc 100644 (file)
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -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)

diff --git a/include/asm-ia64/meminit.h b/include/asm-ia64/meminit.h
index 894bc4d..6a33a07 100644 (file)
--- a/include/asm-ia64/meminit.h
+++ b/include/asm-ia64/meminit.h
@@ -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 */