lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[PATCH] Replace highest_possible_node_id() with nr_node_ids

Browse Source 
highest_possible_node_id() is currently used to calculate the last possible
node idso that the network subsystem can figure out how to size per node
arrays.

I think having the ability to determine the maximum amount of nodes in a
system at runtime is useful but then we should name this entry
correspondingly, it should return the number of node_ids, and the the value
needs to be setup only once on bootup.  The node_possible_map does not
change after bootup.

This patch introduces nr_node_ids and replaces the use of
highest_possible_node_id().  nr_node_ids is calculated on bootup when the
page allocators pagesets are initialized.

[deweerdt@free.fr: fix oops]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter
2007-02-20 13:57:51 -08:00
committed by Linus Torvalds
parent 5ec553a904
commit 74c7aa8b85
3 changed files with 25 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
mm/page_alloc.c
View File

@@ -664,6 +664,26 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
return i;
}
#if MAX_NUMNODES > 1
int nr_node_ids __read_mostly;
EXPORT_SYMBOL(nr_node_ids);
/*
* Figure out the number of possible node ids.
*/
static void __init setup_nr_node_ids(void)
{
unsigned int node;
unsigned int highest = 0;
for_each_node_mask(node, node_possible_map)
highest = node;
nr_node_ids = highest + 1;
}
#else
static void __init setup_nr_node_ids(void) {}
#endif
#ifdef CONFIG_NUMA
/*
* Called from the slab reaper to drain pagesets on a particular node that
@@ -3169,6 +3189,7 @@ static int __init init_per_zone_pages_min(void)
min_free_kbytes = 65536;
setup_per_zone_pages_min();
setup_per_zone_lowmem_reserve();
setup_nr_node_ids();
return 0;
}
module_init(init_per_zone_pages_min)
@@ -3370,18 +3391,4 @@ EXPORT_SYMBOL(pfn_to_page);
EXPORT_SYMBOL(page_to_pfn);
#endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */
#if MAX_NUMNODES > 1
/*
* Find the highest possible node id.
*/
int highest_possible_node_id(void)
{
unsigned int node;
unsigned int highest = 0;
for_each_node_mask(node, node_possible_map)
highest = node;
return highest;
}
EXPORT_SYMBOL(highest_possible_node_id);
#endif