From 63d027a63888e993545d10fdfe4107d543f01bca Mon Sep 17 00:00:00 2001 From: Robin Holt Date: Wed, 29 Sep 2010 14:00:56 -0500 Subject: [PATCH] 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 To: Gary Hade To: Badari Pulavarty To: Ingo Molnar Reviewed-by: KAMEZAWA Hiroyuki Signed-off-by: Greg Kroah-Hartman --- drivers/base/node.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/base/node.c b/drivers/base/node.c index 2872e86837b2..ee53558b452f 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -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; } -- 2.11.4.GIT