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SubjectRe: [PATCH] for_each_online_pgdat (take2) [2/5] for_each_bootmem
KAMEZAWA Hiroyuki wrote:
> This patch adds list_head to bootmem_data_t and make bootmems use it.
> bootmem list is sorted by node_boot_start.
>
> Only nodes against which init_bootmem() is called are linked to the list.
> (i386 allocates bootmem from only one node not from all online nodes.)
>
> A summary:
> 1. for_each_online_pgdat() traverses all *online* nodes.
> 2. alloc_bootmem() allocates memory only from initialized-for-bootmem nodes.
>
> Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
>
> Index: linux-2.6.16-rc4-mm2/include/linux/bootmem.h
> ===================================================================
> --- linux-2.6.16-rc4-mm2.orig/include/linux/bootmem.h
> +++ linux-2.6.16-rc4-mm2/include/linux/bootmem.h
> @@ -38,6 +38,7 @@ typedef struct bootmem_data {
> unsigned long last_pos;
> unsigned long last_success; /* Previous allocation point. To speed
> * up searching */
> + struct list_head list;
> } bootmem_data_t;
>
> extern unsigned long __init bootmem_bootmap_pages (unsigned long);
> Index: linux-2.6.16-rc4-mm2/mm/bootmem.c
> ===================================================================
> --- linux-2.6.16-rc4-mm2.orig/mm/bootmem.c
> +++ linux-2.6.16-rc4-mm2/mm/bootmem.c
> @@ -33,6 +33,7 @@ EXPORT_SYMBOL(max_pfn); /* This is expo
> * dma_get_required_mask(), which uses
> * it, can be an inline function */
>
> +LIST_HEAD(bdata_list);
> #ifdef CONFIG_CRASH_DUMP
> /*
> * If we have booted due to a crash, max_pfn will be a very low value. We need
> @@ -52,6 +53,27 @@ unsigned long __init bootmem_bootmap_pag
>
> return mapsize;
> }
> +/*
> + * link bdata in order
> + */
> +static void link_bootmem(bootmem_data_t *bdata)
> +{
> + bootmem_data_t *ent;
> + if (list_empty(&bdata_list)) {
> + list_add(&bdata->list, &bdata_list);
> + return;
> + }
> + /* insert in order */
> + list_for_each_entry(ent, &bdata_list, list) {
> + if (ent->node_boot_start < ent->node_boot_start) {
>
not a kernel hacker, but even I know that that 'if' isn't what
you want. :)
> + list_add_tail(&bdata->list, &ent->list);
> + return;
> + }
> + }
> + list_add_tail(&bdata->list, &bdata_list);
> + return;
> +}
> +
>
> /*
> * Called once to set up the allocator itself.
> @@ -62,13 +84,11 @@ static unsigned long __init init_bootmem
> bootmem_data_t *bdata = pgdat->bdata;
> unsigned long mapsize = ((end - start)+7)/8;
>
> - pgdat->pgdat_next = pgdat_list;
> - pgdat_list = pgdat;
> -
> mapsize = ALIGN(mapsize, sizeof(long));
> bdata->node_bootmem_map = phys_to_virt(mapstart << PAGE_SHIFT);
> bdata->node_boot_start = (start << PAGE_SHIFT);
> bdata->node_low_pfn = end;
> + link_bootmem(bdata);
>
> /*
> * Initially all pages are reserved - setup_arch() has to
> @@ -383,12 +403,11 @@ unsigned long __init free_all_bootmem (v
>
> void * __init __alloc_bootmem(unsigned long size, unsigned long align, unsigned long goal)
> {
> - pg_data_t *pgdat = pgdat_list;
> + bootmem_data_t *bdata;
> void *ptr;
>
> - for_each_pgdat(pgdat)
> - if ((ptr = __alloc_bootmem_core(pgdat->bdata, size,
> - align, goal, 0)))
> + list_for_each_entry(bdata, &bdata_list, list)
> + if ((ptr = __alloc_bootmem_core(bdata, size, align, goal, 0)))
> return(ptr);
>
> /*
> @@ -416,11 +435,11 @@ void * __init __alloc_bootmem_node(pg_da
>
> void * __init __alloc_bootmem_low(unsigned long size, unsigned long align, unsigned long goal)
> {
> - pg_data_t *pgdat = pgdat_list;
> + bootmem_data_t *bdata;
> void *ptr;
>
> - for_each_pgdat(pgdat)
> - if ((ptr = __alloc_bootmem_core(pgdat->bdata, size,
> + list_for_each_entry(bdata, &bdata_list, list)
> + if ((ptr = __alloc_bootmem_core(bdata, size,
> align, goal, LOW32LIMIT)))
> return(ptr);
>
> -
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>

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