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driver core: Convert link_mem_sections to use find_memory_block_hinted. 

Modify link_mem_sections() to pass in the previous mem_block as a hint to
locating the next mem_block.  Since they are typically added in order this
results in a massive saving in time during boot of a very large system.
For example, on a 16TB x86_64 machine, it reduced the total time spent
linking all node's memory sections from 1 hour, 27 minutes to 46 seconds.

Signed-off-by: Robin Holt <holt@sgi.com>
To: Gary Hade <garyhade@us.ibm.com>
To: Badari Pulavarty <pbadari@us.ibm.com>
To: Ingo Molnar <mingo@elte.hu>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
Robin Holt 2010-09-29 14:00:56 -05:00 committed by Greg Kroah-Hartman
parent 98383031ed
commit 63d027a638
1 changed files with 5 additions and 3 deletions
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8
drivers/base/node.c
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@ -409,25 +409,27 @@ static int link_mem_sections(int nid)
unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
unsigned long pfn;
struct memory_block *mem_blk = NULL;
int err = 0;
for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
unsigned long section_nr = pfn_to_section_nr(pfn);
struct mem_section *mem_sect;
struct memory_block *mem_blk;
int ret;
if (!present_section_nr(section_nr))
continue;
mem_sect = __nr_to_section(section_nr);
mem_blk = find_memory_block(mem_sect);
mem_blk = find_memory_block_hinted(mem_sect, mem_blk);
ret = register_mem_sect_under_node(mem_blk, nid);
if (!err)
err = ret;
/* discard ref obtained in find_memory_block() */
kobject_put(&mem_blk->sysdev.kobj);
}
if (mem_blk)
kobject_put(&mem_blk->sysdev.kobj);
return err;
}