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>

3 files changed, 187 insertions, 2 deletions

diff --git a/mm/Kconfig b/mm/Kconfig
index 17b8947aa7da..e4a33b9479b2 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -115,6 +115,10 @@ config SPARSEMEM_EXTREME
 config SPARSEMEM_VMEMMAP_ENABLE
         bool
 
+config SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
+        def_bool y
+        depends on SPARSEMEM && X86_64
+
 config SPARSEMEM_VMEMMAP
         bool "Sparse Memory virtual memmap"
         depends on SPARSEMEM && SPARSEMEM_VMEMMAP_ENABLE
diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index 9506c39942f6..392b9bb5bc01 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -43,6 +43,8 @@ static void * __init_refok __earlyonly_bootmem_alloc(int node,
         return __alloc_bootmem_node_high(NODE_DATA(node), size, align, goal);
 }
 
+static void *vmemmap_buf;
+static void *vmemmap_buf_end;
 
 void * __meminit vmemmap_alloc_block(unsigned long size, int node)
 {
@@ -64,6 +66,24 @@ void * __meminit vmemmap_alloc_block(unsigned long size, int node)
                                 __pa(MAX_DMA_ADDRESS));
 }
 
+/* need to make sure size is all the same during early stage */
+void * __meminit vmemmap_alloc_block_buf(unsigned long size, int node)
+{
+        void *ptr;
+
+        if (!vmemmap_buf)
+                return vmemmap_alloc_block(size, node);
+
+        /* take the from buf */
+        ptr = (void *)ALIGN((unsigned long)vmemmap_buf, size);
+        if (ptr + size > vmemmap_buf_end)
+                return vmemmap_alloc_block(size, node);
+
+        vmemmap_buf = ptr + size;
+
+        return ptr;
+}
+
 void __meminit vmemmap_verify(pte_t *pte, int node,
                                 unsigned long start, unsigned long end)
 {
@@ -80,7 +100,7 @@ pte_t * __meminit vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node)
         pte_t *pte = pte_offset_kernel(pmd, addr);
         if (pte_none(*pte)) {
                 pte_t entry;
-                void *p = vmemmap_alloc_block(PAGE_SIZE, node);
+                void *p = vmemmap_alloc_block_buf(PAGE_SIZE, node);
                 if (!p)
                         return NULL;
                 entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL);
@@ -163,3 +183,55 @@ struct page * __meminit sparse_mem_map_populate(unsigned long pnum, int nid)
 
         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)
+{
+        unsigned long pnum;
+        unsigned long size = sizeof(struct page) * PAGES_PER_SECTION;
+        void *vmemmap_buf_start;
+
+        size = ALIGN(size, PMD_SIZE);
+        vmemmap_buf_start = __earlyonly_bootmem_alloc(nodeid, size * map_count,
+                         PMD_SIZE, __pa(MAX_DMA_ADDRESS));
+
+        if (vmemmap_buf_start) {
+                vmemmap_buf = vmemmap_buf_start;
+                vmemmap_buf_end = vmemmap_buf_start + size * map_count;
+        }
+
+        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;
+        }
+
+        if (vmemmap_buf_start) {
+                /* need to free left buf */
+#ifdef CONFIG_NO_BOOTMEM
+                free_early(__pa(vmemmap_buf_start), __pa(vmemmap_buf_end));
+                if (vmemmap_buf_start < vmemmap_buf) {
+                        char name[15];
+
+                        snprintf(name, sizeof(name), "MEMMAP %d", nodeid);
+                        reserve_early_without_check(__pa(vmemmap_buf_start),
+                                                    __pa(vmemmap_buf), name);
+                }
+#else
+                free_bootmem(__pa(vmemmap_buf), vmemmap_buf_end - vmemmap_buf);
+#endif
+                vmemmap_buf = NULL;
+                vmemmap_buf_end = NULL;
+        }
+}
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);
 }