On Fri, 13 Jul 2007 10:45:07 +0800 Joe Jin <[email protected]> wrote:
Something like this?
--- a/mm/hugetlb.c~a
+++ a/mm/hugetlb.c
@@ -105,13 +105,20 @@ static void free_huge_page(struct page *
static int alloc_fresh_huge_page(void)
{
- static int nid = 0;
+ static int prev_nid;
+ static DEFINE_SPINLOCK(nid_lock);
struct page *page;
- page = alloc_pages_node(nid, htlb_alloc_mask|__GFP_COMP|__GFP_NOWARN,
- HUGETLB_PAGE_ORDER);
- nid = next_node(nid, node_online_map);
+ int nid;
+
+ spin_lock(&nid_lock);
+ nid = next_node(prev_nid, node_online_map);
if (nid == MAX_NUMNODES)
nid = first_node(node_online_map);
+ prev_nid = nid;
+ spin_unlock(&nid_lock);
+
+ page = alloc_pages_node(nid, htlb_alloc_mask|__GFP_COMP|__GFP_NOWARN,
+ HUGETLB_PAGE_ORDER);
if (page) {
set_compound_page_dtor(page, free_huge_page);
spin_lock(&hugetlb_lock);
_
I think this will never get pages from node 0 ? Because nid =
next_node(prev_node,node_online_map) and even if prev_node = 0, nid will
become 1.
It'll start out at node 1. But it will visit the final node (which is less
than MAX_NUMNODES) and will then advance onto the fist node (which can be
= 0).
This code needs a bit of thought and testing for the non-numa case too
please. At the least, there might be optimisation opportunities.
I tested on non-numa machine. Your patch works fine.
Thanks,
-Guru
-
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