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Subject[PATCH v3 2/2] mm/sparse: start using sparse_init_nid(), and remove old code
Date
Change sprase_init() to only find the pnum ranges that belong to a specific
node and call sprase_init_nid() for that range from sparse_init().

Delete all the code that became obsolete with this change.

Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
---
include/linux/mm.h | 5 -
mm/sparse-vmemmap.c | 39 --------
mm/sparse.c | 220 ++++----------------------------------------
3 files changed, 17 insertions(+), 247 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 85530fdfb1f2..a7438be90658 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2646,11 +2646,6 @@ extern int randomize_va_space;
const char * arch_vma_name(struct vm_area_struct *vma);
void print_vma_addr(char *prefix, unsigned long rip);

-void sparse_mem_maps_populate_node(struct page **map_map,
- unsigned long pnum_begin,
- unsigned long pnum_end,
- unsigned long map_count,
- int nodeid);
struct page * sparse_populate_node(unsigned long pnum_begin,
unsigned long pnum_end,
unsigned long map_count,
diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index b3e325962306..4edc877cfe82 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -273,45 +273,6 @@ 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;
- int nr_consumed_maps = 0;
-
- 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++) {
- if (!present_section_nr(pnum))
- continue;
-
- map_map[nr_consumed_maps] = sparse_mem_map_populate(pnum, nodeid, NULL);
- if (map_map[nr_consumed_maps++])
- continue;
- pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
- __func__);
- }
-
- if (vmemmap_buf_start) {
- /* need to free left buf */
- memblock_free_early(__pa(vmemmap_buf),
- vmemmap_buf_end - vmemmap_buf);
- vmemmap_buf = NULL;
- vmemmap_buf_end = NULL;
- }
-}
-
struct page * __init sparse_populate_node(unsigned long pnum_begin,
unsigned long pnum_end,
unsigned long map_count,
diff --git a/mm/sparse.c b/mm/sparse.c
index c18d92b8ab9b..f6da0b07947b 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -200,11 +200,10 @@ static inline int next_present_section_nr(int section_nr)
(section_nr <= __highest_present_section_nr)); \
section_nr = next_present_section_nr(section_nr))

-/*
- * Record how many memory sections are marked as present
- * during system bootup.
- */
-static int __initdata nr_present_sections;
+static inline unsigned long first_present_section_nr(void)
+{
+ return next_present_section_nr(-1);
+}

/* Record a memory area against a node. */
void __init memory_present(int nid, unsigned long start, unsigned long end)
@@ -235,7 +234,6 @@ void __init memory_present(int nid, unsigned long start, unsigned long end)
ms->section_mem_map = sparse_encode_early_nid(nid) |
SECTION_IS_ONLINE;
section_mark_present(ms);
- nr_present_sections++;
}
}
}
@@ -377,34 +375,6 @@ static void __init check_usemap_section_nr(int nid, unsigned long *usemap)
}
#endif /* CONFIG_MEMORY_HOTREMOVE */

-static void __init sparse_early_usemaps_alloc_node(void *data,
- unsigned long pnum_begin,
- unsigned long pnum_end,
- unsigned long usemap_count, int nodeid)
-{
- void *usemap;
- unsigned long pnum;
- unsigned long **usemap_map = (unsigned long **)data;
- int size = usemap_size();
- int nr_consumed_maps = 0;
-
- usemap = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nodeid),
- size * usemap_count);
- if (!usemap) {
- pr_warn("%s: allocation failed\n", __func__);
- return;
- }
-
- for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
- if (!present_section_nr(pnum))
- continue;
- usemap_map[nr_consumed_maps] = usemap;
- usemap += size;
- check_usemap_section_nr(nodeid, usemap_map[nr_consumed_maps]);
- nr_consumed_maps++;
- }
-}
-
#ifndef CONFIG_SPARSEMEM_VMEMMAP
struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid,
struct vmem_altmap *altmap)
@@ -418,44 +388,6 @@ struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid,
BOOTMEM_ALLOC_ACCESSIBLE, 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)
-{
- void *map;
- unsigned long pnum;
- unsigned long size = sizeof(struct page) * PAGES_PER_SECTION;
- int nr_consumed_maps;
-
- size = PAGE_ALIGN(size);
- map = memblock_virt_alloc_try_nid_raw(size * map_count,
- PAGE_SIZE, __pa(MAX_DMA_ADDRESS),
- BOOTMEM_ALLOC_ACCESSIBLE, nodeid);
- if (map) {
- nr_consumed_maps = 0;
- for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
- if (!present_section_nr(pnum))
- continue;
- map_map[nr_consumed_maps] = map;
- map += size;
- nr_consumed_maps++;
- }
- return;
- }
-
- /* fallback */
- nr_consumed_maps = 0;
- for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
- if (!present_section_nr(pnum))
- continue;
- map_map[nr_consumed_maps] = sparse_mem_map_populate(pnum, nodeid, NULL);
- if (map_map[nr_consumed_maps++])
- continue;
- pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
- __func__);
- }
-}

static unsigned long section_map_size(void)
{
@@ -495,73 +427,15 @@ struct page * __init sparse_populate_node_section(struct page *map_base,
}
#endif /* !CONFIG_SPARSEMEM_VMEMMAP */

-static void __init sparse_early_mem_maps_alloc_node(void *data,
- unsigned long pnum_begin,
- unsigned long pnum_end,
- unsigned long map_count, int nodeid)
-{
- struct page **map_map = (struct page **)data;
- sparse_mem_maps_populate_node(map_map, pnum_begin, pnum_end,
- map_count, nodeid);
-}
-
void __weak __meminit vmemmap_populate_print_last(void)
{
}

-/**
- * alloc_usemap_and_memmap - memory alloction for pageblock flags and vmemmap
- * @map: usemap_map for pageblock flags or mmap_map for vmemmap
- * @unit_size: size of map unit
- */
-static void __init alloc_usemap_and_memmap(void (*alloc_func)
- (void *, unsigned long, unsigned long,
- unsigned long, int), void *data,
- int data_unit_size)
-{
- unsigned long pnum;
- unsigned long map_count;
- int nodeid_begin = 0;
- unsigned long pnum_begin = 0;
-
- for_each_present_section_nr(0, pnum) {
- struct mem_section *ms;
-
- ms = __nr_to_section(pnum);
- nodeid_begin = sparse_early_nid(ms);
- pnum_begin = pnum;
- break;
- }
- map_count = 1;
- for_each_present_section_nr(pnum_begin + 1, pnum) {
- struct mem_section *ms;
- int nodeid;
-
- 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*/
- alloc_func(data, pnum_begin, pnum,
- map_count, nodeid_begin);
- /* new start, update count etc*/
- nodeid_begin = nodeid;
- pnum_begin = pnum;
- data += map_count * data_unit_size;
- map_count = 1;
- }
- /* ok, last chunk */
- alloc_func(data, pnum_begin, __highest_present_section_nr+1,
- map_count, nodeid_begin);
-}
-
/*
* Initialize sparse on a specific node. The node spans [pnum_begin, pnum_end)
* And number of present sections in this node is map_count.
*/
-void __init sparse_init_nid(int nid, unsigned long pnum_begin,
+static void __init sparse_init_nid(int nid, unsigned long pnum_begin,
unsigned long pnum_end,
unsigned long map_count)
{
@@ -617,87 +491,27 @@ void __init sparse_init_nid(int nid, unsigned long pnum_begin,
*/
void __init sparse_init(void)
{
- unsigned long pnum;
- struct page *map;
- struct page **map_map;
- unsigned long *usemap;
- unsigned long **usemap_map;
- int size, size2;
- int nr_consumed_maps = 0;
-
- /* see include/linux/mmzone.h 'struct mem_section' definition */
- BUILD_BUG_ON(!is_power_of_2(sizeof(struct mem_section)));
+ unsigned long pnum_begin = first_present_section_nr();
+ int nid_begin = sparse_early_nid(__nr_to_section(pnum_begin));
+ unsigned long pnum_end, map_count = 1;

/* Setup pageblock_order for HUGETLB_PAGE_SIZE_VARIABLE */
set_pageblock_order();

- /*
- * map is using big page (aka 2M in x86 64 bit)
- * usemap is less one page (aka 24 bytes)
- * so alloc 2M (with 2M align) and 24 bytes in turn will
- * make next 2M slip to one more 2M later.
- * then in big system, the memory will have a lot of holes...
- * here try to allocate 2M pages continuously.
- *
- * powerpc need to call sparse_init_one_section right after each
- * sparse_early_mem_map_alloc, so allocate usemap_map at first.
- */
- size = sizeof(unsigned long *) * nr_present_sections;
- usemap_map = memblock_virt_alloc(size, 0);
- if (!usemap_map)
- panic("can not allocate usemap_map\n");
- alloc_usemap_and_memmap(sparse_early_usemaps_alloc_node,
- (void *)usemap_map,
- sizeof(usemap_map[0]));
-
- size2 = sizeof(struct page *) * nr_present_sections;
- map_map = memblock_virt_alloc(size2, 0);
- if (!map_map)
- panic("can not allocate map_map\n");
- alloc_usemap_and_memmap(sparse_early_mem_maps_alloc_node,
- (void *)map_map,
- sizeof(map_map[0]));
-
- /* The numner of present sections stored in nr_present_sections
- * are kept the same since mem sections are marked as present in
- * memory_present(). In this for loop, we need check which sections
- * failed to allocate memmap or usemap, then clear its
- * ->section_mem_map accordingly. During this process, we need
- * increase 'nr_consumed_maps' whether its allocation of memmap
- * or usemap failed or not, so that after we handle the i-th
- * memory section, can get memmap and usemap of (i+1)-th section
- * correctly. */
- for_each_present_section_nr(0, pnum) {
- struct mem_section *ms;
-
- if (nr_consumed_maps >= nr_present_sections) {
- pr_err("nr_consumed_maps goes beyond nr_present_sections\n");
- break;
- }
- ms = __nr_to_section(pnum);
- usemap = usemap_map[nr_consumed_maps];
- if (!usemap) {
- ms->section_mem_map = 0;
- nr_consumed_maps++;
- continue;
- }
+ for_each_present_section_nr(pnum_begin + 1, pnum_end) {
+ int nid = sparse_early_nid(__nr_to_section(pnum_end));

- map = map_map[nr_consumed_maps];
- if (!map) {
- ms->section_mem_map = 0;
- nr_consumed_maps++;
+ if (nid == nid_begin) {
+ map_count++;
continue;
}
-
- sparse_init_one_section(__nr_to_section(pnum), pnum, map,
- usemap);
- nr_consumed_maps++;
+ sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count);
+ nid_begin = nid;
+ pnum_begin = pnum_end;
+ map_count = 1;
}
-
+ sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count);
vmemmap_populate_print_last();
-
- memblock_free_early(__pa(map_map), size2);
- memblock_free_early(__pa(usemap_map), size);
}

#ifdef CONFIG_MEMORY_HOTPLUG
--
2.18.0
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