Messages in this thread Patch in this message | | | From | Mel Gorman <> | Subject | [PATCH 16/22] Do not setup zonelist cache when there is only one node | Date | Wed, 22 Apr 2009 14:53:21 +0100 |
| |
There is a zonelist cache which is used to track zones that are not in the allowed cpuset or found to be recently full. This is to reduce cache footprint on large machines. On smaller machines, it just incurs cost for no gain. This patch only uses the zonelist cache when there are NUMA nodes.
Signed-off-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Christoph Lameter <cl@linux-foundation.org> --- mm/page_alloc.c | 7 +++++-- 1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 7f45de1..e59bb80 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1467,8 +1467,11 @@ this_zone_full: if (NUMA_BUILD) zlc_mark_zone_full(zonelist, z); try_next_zone: - if (NUMA_BUILD && !did_zlc_setup) { - /* we do zlc_setup after the first zone is tried */ + if (NUMA_BUILD && !did_zlc_setup && num_online_nodes() > 1) { + /* + * we do zlc_setup after the first zone is tried but only + * if there are multiple nodes make it worthwhile + */ allowednodes = zlc_setup(zonelist, alloc_flags); zlc_active = 1; did_zlc_setup = 1; -- 1.5.6.5
| |