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| author | Robin Holt <holt@sgi.com> | 2010-09-29 21:00:56 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 19:16:44 +0200 |
| commit | 63d027a63888e993545d10fdfe4107d543f01bca (patch) | |
| tree | 223e4f3905c1519625e3973d8f25482c1f86b94f /drivers | |
| parent | driver core: Introduce find_memory_block_hinted which utilizes kset_find_obj_... (diff) | |
| download | linux-63d027a63888e993545d10fdfe4107d543f01bca.tar.xz linux-63d027a63888e993545d10fdfe4107d543f01bca.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/base/node.c | 8 |
1 files 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; } |