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[PATCH] for_each_online_pgdat: for_each_bootmem

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Add a 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 only from one node(0) 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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
KAMEZAWA Hiroyuki 2006-03-27 01:15:58 -08:00 committed by Linus Torvalds
parent 8357f8695d
commit 679bc9fbb5
2 changed files with 30 additions and 10 deletions
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1
include/linux/bootmem.h
View File

@ -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);

39
mm/bootmem.c
View File

@ -33,6 +33,7 @@ EXPORT_SYMBOL(max_pfn); /* This is exported so
* dma_get_required_mask(), which uses
* it, can be an inline function */
static 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_pages (unsigned long pages)
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 (bdata->node_boot_start < ent->node_boot_start) {
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_core (pg_data_t *pgdat,
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 (void)
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_data_t *pgdat, unsigned long size, unsigne
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);