On Thu, Jun 28, 2018 at 01:30:10PM -0400, Pavel Tatashin wrote:
> 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.tatas...@oracle.com>
> ---
> include/linux/mm.h | 5 -
> mm/sparse-vmemmap.c | 39 --------
> mm/sparse.c | 223 ++++----------------------------------------
> 3 files changed, 16 insertions(+), 251 deletions(-)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index ba200808dd5f..a25395071a13 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 4655503bdc66..0adda7c32feb 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 60eaa2a4842a..ad2522e733bb 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -200,12 +200,6 @@ 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;
> -
> /* Record a memory area against a node. */
> void __init memory_present(int nid, unsigned long start, unsigned long end)
> {
> @@ -235,7 +229,6 @@ 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 +370,6 @@ 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 +383,6 @@ 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 +422,15 @@ struct page * __init
> sprase_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)
> {
> @@ -616,87 +485,27 @@ 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;
> + unsigned long pnum_begin, pnum_end, map_count;
> + int nid, nid_begin;
>
> - /* see include/linux/mmzone.h 'struct mem_section' definition */
> - BUILD_BUG_ON(!is_power_of_2(sizeof(struct mem_section)));
> -
> - /* 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(0, pnum_begin)
> + break;
Hi Pavel,
besides this first for_each_present_section_nr(), what about writing a static
inline
function that returns next_present_section_nr(-1) ?
Something like:
static inline int first_present_section_nr(void)
{
return next_present_section_nr(-1);
}
pnum_begin = first_present_section_nr();
I think it will generate the same code, but maybe it is more readable?
>
> - map = map_map[nr_consumed_maps];
> - if (!map) {
> - ms->section_mem_map = 0;
> - nr_consumed_maps++;
> + nid_begin = sparse_early_nid(__nr_to_section(pnum_begin));
> + map_count = 1;
> + for_each_present_section_nr(pnum_begin + 1, pnum_end) {
> + nid = sparse_early_nid(__nr_to_section(pnum_end));
> + 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, 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
>
--
Oscar Salvador
SUSE L3
