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authorLee Schermerhorn <Lee.Schermerhorn@hp.com>2009-09-22 00:01:25 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-22 14:17:26 (GMT)
commit57dd28fb0513d2f772bb215f27925165e7b9ce5f (patch)
tree6ebdf5b1a336e75b156d7818273af1d78ea78ac6 /mm/hugetlb.c
parent41a25e7e67b8be33d7598ff7968b9a8b405b6567 (diff)
hugetlb: restore interleaving of bootmem huge pages
I noticed that alloc_bootmem_huge_page() will only advance to the next node on failure to allocate a huge page, potentially filling nodes with huge-pages. I asked about this on linux-mm and linux-numa, cc'ing the usual huge page suspects. Mel Gorman responded: I strongly suspect that the same node being used until allocation failure instead of round-robin is an oversight and not deliberate at all. It appears to be a side-effect of a fix made way back in commit 63b4613c3f0d4b724ba259dc6c201bb68b884e1a ["hugetlb: fix hugepage allocation with memoryless nodes"]. Prior to that patch it looked like allocations would always round-robin even when allocation was successful. This patch--factored out of my "hugetlb mempolicy" series--moves the advance of the hstate next node from which to allocate up before the test for success of the attempted allocation. Note that alloc_bootmem_huge_page() is only used for order > MAX_ORDER huge pages. I'll post a separate patch for mainline/stable, as the above mentioned "balance freeing" series renamed the next node to alloc function. Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com> Reviewed-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Andy Whitcroft <apw@canonical.com> Reviewed-by: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r--mm/hugetlb.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f10cc27..c001f84 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1031,6 +1031,7 @@ int __weak alloc_bootmem_huge_page(struct hstate *h)
NODE_DATA(h->next_nid_to_alloc),
huge_page_size(h), huge_page_size(h), 0);
+ hstate_next_node_to_alloc(h);
if (addr) {
/*
* Use the beginning of the huge page to store the
@@ -1040,7 +1041,6 @@ int __weak alloc_bootmem_huge_page(struct hstate *h)
m = addr;
goto found;
}
- hstate_next_node_to_alloc(h);
nr_nodes--;
}
return 0;

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