sparsemem: Put mem map for one node together.

Add vmemmap_alloc_block_buf for mem map only.

It will fallback to the old way if it cannot get a block that big.

Before this patch, when a node have 128g ram installed, memmap are
split into two parts or more.
[    0.000000]  [ffffea0000000000-ffffea003fffffff] PMD -> [ffff880100600000-ffff88013e9fffff] on node 1
[    0.000000]  [ffffea0040000000-ffffea006fffffff] PMD -> [ffff88013ec00000-ffff88016ebfffff] on node 1
[    0.000000]  [ffffea0070000000-ffffea007fffffff] PMD -> [ffff882000600000-ffff8820105fffff] on node 0
[    0.000000]  [ffffea0080000000-ffffea00bfffffff] PMD -> [ffff882010800000-ffff8820507fffff] on node 0
[    0.000000]  [ffffea00c0000000-ffffea00dfffffff] PMD -> [ffff882050a00000-ffff8820709fffff] on node 0
[    0.000000]  [ffffea00e0000000-ffffea00ffffffff] PMD -> [ffff884000600000-ffff8840205fffff] on node 2
[    0.000000]  [ffffea0100000000-ffffea013fffffff] PMD -> [ffff884020800000-ffff8840607fffff] on node 2
[    0.000000]  [ffffea0140000000-ffffea014fffffff] PMD -> [ffff884060a00000-ffff8840709fffff] on node 2
[    0.000000]  [ffffea0150000000-ffffea017fffffff] PMD -> [ffff886000600000-ffff8860305fffff] on node 3
[    0.000000]  [ffffea0180000000-ffffea01bfffffff] PMD -> [ffff886030800000-ffff8860707fffff] on node 3
[    0.000000]  [ffffea01c0000000-ffffea01ffffffff] PMD -> [ffff888000600000-ffff8880405fffff] on node 4
[    0.000000]  [ffffea0200000000-ffffea022fffffff] PMD -> [ffff888040800000-ffff8880707fffff] on node 4
[    0.000000]  [ffffea0230000000-ffffea023fffffff] PMD -> [ffff88a000600000-ffff88a0105fffff] on node 5
[    0.000000]  [ffffea0240000000-ffffea027fffffff] PMD -> [ffff88a010800000-ffff88a0507fffff] on node 5
[    0.000000]  [ffffea0280000000-ffffea029fffffff] PMD -> [ffff88a050a00000-ffff88a0709fffff] on node 5
[    0.000000]  [ffffea02a0000000-ffffea02bfffffff] PMD -> [ffff88c000600000-ffff88c0205fffff] on node 6
[    0.000000]  [ffffea02c0000000-ffffea02ffffffff] PMD -> [ffff88c020800000-ffff88c0607fffff] on node 6
[    0.000000]  [ffffea0300000000-ffffea030fffffff] PMD -> [ffff88c060a00000-ffff88c0709fffff] on node 6
[    0.000000]  [ffffea0310000000-ffffea033fffffff] PMD -> [ffff88e000600000-ffff88e0305fffff] on node 7
[    0.000000]  [ffffea0340000000-ffffea037fffffff] PMD -> [ffff88e030800000-ffff88e0707fffff] on node 7

after patch will get
[    0.000000]  [ffffea0000000000-ffffea006fffffff] PMD -> [ffff880100200000-ffff88016e5fffff] on node 0
[    0.000000]  [ffffea0070000000-ffffea00dfffffff] PMD -> [ffff882000200000-ffff8820701fffff] on node 1
[    0.000000]  [ffffea00e0000000-ffffea014fffffff] PMD -> [ffff884000200000-ffff8840701fffff] on node 2
[    0.000000]  [ffffea0150000000-ffffea01bfffffff] PMD -> [ffff886000200000-ffff8860701fffff] on node 3
[    0.000000]  [ffffea01c0000000-ffffea022fffffff] PMD -> [ffff888000200000-ffff8880701fffff] on node 4
[    0.000000]  [ffffea0230000000-ffffea029fffffff] PMD -> [ffff88a000200000-ffff88a0701fffff] on node 5
[    0.000000]  [ffffea02a0000000-ffffea030fffffff] PMD -> [ffff88c000200000-ffff88c0701fffff] on node 6
[    0.000000]  [ffffea0310000000-ffffea037fffffff] PMD -> [ffff88e000200000-ffff88e0701fffff] on node 7

-v2: change buf to vmemmap_buf instead according to Ingo
     also add CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER according to Ingo
-v3: according to Andrew, use sizeof(name) instead of hard coded 15

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <1265793639-15071-19-git-send-email-yinghai@kernel.org>
Cc: Christoph Lameter <cl@linux-foundation.org>
Acked-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 110 insertions, 1 deletions

diff --git a/mm/sparse.c b/mm/sparse.c
index 0cdaf0b58457..9b6b93a4d78d 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -390,8 +390,65 @@ struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid)
                        PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION));
         return map;
 }
+void __init sparse_mem_maps_populate_node(struct page **map_map,
+                                          unsigned long pnum_begin,
+                                          unsigned long pnum_end,
+                                          unsigned long map_count, int nodeid)
+{
+        void *map;
+        unsigned long pnum;
+        unsigned long size = sizeof(struct page) * PAGES_PER_SECTION;
+
+        map = alloc_remap(nodeid, size * map_count);
+        if (map) {
+                for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
+                        if (!present_section_nr(pnum))
+                                continue;
+                        map_map[pnum] = map;
+                        map += size;
+                }
+                return;
+        }
+
+        size = PAGE_ALIGN(size);
+        map = alloc_bootmem_pages_node(NODE_DATA(nodeid), size * map_count);
+        if (map) {
+                for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
+                        if (!present_section_nr(pnum))
+                                continue;
+                        map_map[pnum] = map;
+                        map += size;
+                }
+                return;
+        }
+
+        /* fallback */
+        for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
+                struct mem_section *ms;
+
+                if (!present_section_nr(pnum))
+                        continue;
+                map_map[pnum] = sparse_mem_map_populate(pnum, nodeid);
+                if (map_map[pnum])
+                        continue;
+                ms = __nr_to_section(pnum);
+                printk(KERN_ERR "%s: sparsemem memory map backing failed "
+                        "some memory will not be available.\n", __func__);
+                ms->section_mem_map = 0;
+        }
+}
 #endif /* !CONFIG_SPARSEMEM_VMEMMAP */
 
+static void __init sparse_early_mem_maps_alloc_node(struct page **map_map,
+                                 unsigned long pnum_begin,
+                                 unsigned long pnum_end,
+                                 unsigned long map_count, int nodeid)
+{
+        sparse_mem_maps_populate_node(map_map, pnum_begin, pnum_end,
+                                         map_count, nodeid);
+}
+
+#ifndef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
 static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum)
 {
         struct page *map;
@@ -407,6 +464,7 @@ static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum)
         ms->section_mem_map = 0;
         return NULL;
 }
+#endif
 
 void __attribute__((weak)) __meminit vmemmap_populate_print_last(void)
 {
@@ -420,12 +478,14 @@ void __init sparse_init(void)
 {
         unsigned long pnum;
         struct page *map;
+        struct page **map_map;
         unsigned long *usemap;
         unsigned long **usemap_map;
-        int size;
+        int size, size2;
         int nodeid_begin = 0;
         unsigned long pnum_begin = 0;
         unsigned long usemap_count;
+        unsigned long map_count;
 
         /*
          * map is using big page (aka 2M in x86 64 bit)
@@ -478,6 +538,48 @@ void __init sparse_init(void)
         sparse_early_usemaps_alloc_node(usemap_map, pnum_begin, NR_MEM_SECTIONS,
                                          usemap_count, nodeid_begin);
 
+#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
+        size2 = sizeof(struct page *) * NR_MEM_SECTIONS;
+        map_map = alloc_bootmem(size2);
+        if (!map_map)
+                panic("can not allocate map_map\n");
+
+        for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
+                struct mem_section *ms;
+
+                if (!present_section_nr(pnum))
+                        continue;
+                ms = __nr_to_section(pnum);
+                nodeid_begin = sparse_early_nid(ms);
+                pnum_begin = pnum;
+                break;
+        }
+        map_count = 1;
+        for (pnum = pnum_begin + 1; pnum < NR_MEM_SECTIONS; pnum++) {
+                struct mem_section *ms;
+                int nodeid;
+
+                if (!present_section_nr(pnum))
+                        continue;
+                ms = __nr_to_section(pnum);
+                nodeid = sparse_early_nid(ms);
+                if (nodeid == nodeid_begin) {
+                        map_count++;
+                        continue;
+                }
+                /* ok, we need to take cake of from pnum_begin to pnum - 1*/
+                sparse_early_mem_maps_alloc_node(map_map, pnum_begin, pnum,
+                                                 map_count, nodeid_begin);
+                /* new start, update count etc*/
+                nodeid_begin = nodeid;
+                pnum_begin = pnum;
+                map_count = 1;
+        }
+        /* ok, last chunk */
+        sparse_early_mem_maps_alloc_node(map_map, pnum_begin, NR_MEM_SECTIONS,
+                                         map_count, nodeid_begin);
+#endif
+
         for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
                 if (!present_section_nr(pnum))
                         continue;
@@ -486,7 +588,11 @@ void __init sparse_init(void)
                 if (!usemap)
                         continue;
 
+#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
+                map = map_map[pnum];
+#else
                 map = sparse_early_mem_map_alloc(pnum);
+#endif
                 if (!map)
                         continue;
 
@@ -496,6 +602,9 @@ void __init sparse_init(void)
 
         vmemmap_populate_print_last();
 
+#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
+        free_bootmem(__pa(map_map), size2);
+#endif
         free_bootmem(__pa(usemap_map), size);
 }