Messages in this thread Patch in this message | | | Date | Thu, 10 Nov 2005 15:27:12 -0800 (PST) | From | Christoph Lameter <> | Subject | [PATCH] dequeue a huge page near to this node |
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The following patch changes the dequeueing to select a huge page near the node executing instead of always beginning to check for free nodes from node 0. This will result in a placement of the huge pages near the executing processor improving performance.
The existing implementation can place the huge pages far away from the executing processor causing significant degradation of performance. The search starting from zero also means that the lower zones quickly run out of memory. Selecting a huge page near the process distributed the huge pages better.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Index: linux-2.6.14-mm1/mm/hugetlb.c =================================================================== --- linux-2.6.14-mm1.orig/mm/hugetlb.c 2005-11-09 10:47:37.000000000 -0800 +++ linux-2.6.14-mm1/mm/hugetlb.c 2005-11-10 15:02:05.000000000 -0800 @@ -36,14 +36,16 @@ static struct page *dequeue_huge_page(vo { int nid = numa_node_id(); struct page *page = NULL; + struct zonelist *zonelist = NODE_DATA(nid)->node_zonelists; + struct zone **z; - if (list_empty(&hugepage_freelists[nid])) { - for (nid = 0; nid < MAX_NUMNODES; ++nid) - if (!list_empty(&hugepage_freelists[nid])) - break; + for (z = zonelist->zones; *z; z++) { + nid = (*z)->zone_pgdat->node_id; + if (!list_empty(&hugepage_freelists[nid])) + break; } - if (nid >= 0 && nid < MAX_NUMNODES && - !list_empty(&hugepage_freelists[nid])) { + + if (z) { page = list_entry(hugepage_freelists[nid].next, struct page, lru); list_del(&page->lru); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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