On Tue, 2012-12-11 at 12:56 +0800, Tang Chen wrote:
> If kernelcore or movablecore is specified at the same time
> with movablecore_map, movablecore_map will have higher
> priority to be satisfied.
> This patch will make find_zone_movable_pfns_for_nodes()
> calculate zone_movable_pfn[] with the limit from
> zone_movable_limit[].
>
> change log:
> Move find_usable_zone_for_movable() to free_area_init_nodes()
> so that sanitize_zone_movable_limit() in patch 3 could use
> initialized movable_zone.
>
> Reported-by: Wu Jianguo <wujianguo@xxxxxxxxxx>
>
> Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
> Reviewed-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
> Reviewed-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
> Tested-by: Lin Feng <linfeng@xxxxxxxxxxxxxx>
> ---
> mm/page_alloc.c | 28 +++++++++++++++++++++++++---
> 1 files changed, 25 insertions(+), 3 deletions(-)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 52c368e..00fa67d 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -4839,9 +4839,17 @@ static void __init find_zone_movable_pfns_for_nodes(void)
> required_kernelcore = max(required_kernelcore, corepages);
> }
>
> - /* If kernelcore was not specified, there is no ZONE_MOVABLE */
> - if (!required_kernelcore)
> + /*
> + * If neither kernelcore/movablecore nor movablecore_map is specified,
> + * there is no ZONE_MOVABLE. But if movablecore_map is specified, the
> + * start pfn of ZONE_MOVABLE has been stored in zone_movable_limit[].
> + */
> + if (!required_kernelcore) {
> + if (movablecore_map.nr_map)
> + memcpy(zone_movable_pfn, zone_movable_limit,
> + sizeof(zone_movable_pfn));
> goto out;
> + }
>
> /* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */
> usable_startpfn = arch_zone_lowest_possible_pfn[movable_zone];
> @@ -4871,10 +4879,24 @@ restart:
> for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
> unsigned long size_pages;
>
> + /*
> + * Find more memory for kernelcore in
> + * [zone_movable_pfn[nid], zone_movable_limit[nid]).
> + */
> start_pfn = max(start_pfn, zone_movable_pfn[nid]);
> if (start_pfn >= end_pfn)
> continue;
>
Hi Chen,
> + if (zone_movable_limit[nid]) {
> + end_pfn = min(end_pfn, zone_movable_limit[nid]);
> + /* No range left for kernelcore in this node */
> + if (start_pfn >= end_pfn) {
> + zone_movable_pfn[nid] =
> + zone_movable_limit[nid];
> + break;
> + }
> + }
> +
Could you explain this part of codes? hard to understand.
> /* Account for what is only usable for kernelcore */
> if (start_pfn < usable_startpfn) {
> unsigned long kernel_pages;
> @@ -4934,12 +4956,12 @@ restart:
> if (usable_nodes && required_kernelcore > usable_nodes)
> goto restart;
>
> +out:
> /* Align start of ZONE_MOVABLE on all nids to MAX_ORDER_NR_PAGES */
> for (nid = 0; nid < MAX_NUMNODES; nid++)
> zone_movable_pfn[nid] =
> roundup(zone_movable_pfn[nid], MAX_ORDER_NR_PAGES);
>
> -out:
> /* restore the node_state */
> node_states[N_HIGH_MEMORY] = saved_node_state;
> }
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