On 2016/8/5 22:04, zhongjiang wrote:
> From: zhong jiang <zhongjiang@xxxxxxxxxx>
>
> when required_kernelcore decrease to zero, we should exit the loop in time.
> because It will waste time to scan the remainder node.
>
> Signed-off-by: zhong jiang <zhongjiang@xxxxxxxxxx>
> ---
> mm/page_alloc.c | 10 +++++++---
> 1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index ea759b9..be7df17 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -6093,7 +6093,7 @@ static unsigned long __init early_calculate_totalpages(void)
> unsigned long pages = end_pfn - start_pfn;
>
> totalpages += pages;
> - if (pages)
> + if (!node_isset(nid, node_states[N_MEMORY]) && pages)
> node_set_state(nid, N_MEMORY);
> }
> return totalpages;
> @@ -6115,6 +6115,7 @@ static void __init find_zone_movable_pfns_for_nodes(void)
> unsigned long totalpages = early_calculate_totalpages();
> int usable_nodes = nodes_weight(node_states[N_MEMORY]);
> struct memblock_region *r;
> + bool avoid_loop = false;
>
> /* Need to find movable_zone earlier when movable_node is specified. */
> find_usable_zone_for_movable();
> @@ -6275,6 +6276,8 @@ restart:
> required_kernelcore -= min(required_kernelcore,
> size_pages);
> kernelcore_remaining -= size_pages;
> + if (!required_kernelcore && avoid_loop)
> + goto out2;
> if (!kernelcore_remaining)
> break;
> }
> @@ -6287,9 +6290,10 @@ restart:
> * satisfied
> */
> usable_nodes--;
> - if (usable_nodes && required_kernelcore > usable_nodes)
> + if (usable_nodes && required_kernelcore > usable_nodes) {
> + avoid_loop = true;
> goto restart;
> -
> + }
> out2:
> /* Align start of ZONE_MOVABLE on all nids to MAX_ORDER_NR_PAGES */
> for (nid = 0; nid < MAX_NUMNODES; nid++)
Any one have any objection about above patch ? please let me know.
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