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SubjectRe: [PATCH 10/10] mm: Create memory regions at boot-up
On 18:01 Fri 27 May     , Ankita Garg wrote:
> Memory regions are created at boot up time, from the information obtained
> from the firmware. This patchset was developed on ARM platform, on which at
> present u-boot bootloader does not export information about memory units that
> can be independently power managed. For the purpose of demonstration, 2 hard
> coded memory regions are created, of 256MB each on the Panda board with 512MB
> RAM.
>
> Signed-off-by: Ankita Garg <ankita@in.ibm.com>
> ---
> include/linux/mmzone.h | 8 +++-----
> mm/page_alloc.c | 29 +++++++++++++++++++++++++++++
> 2 files changed, 32 insertions(+), 5 deletions(-)
>
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index bc3e3fd..5dbe1e1 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -627,14 +627,12 @@ typedef struct mem_region_list_data {
> */
> struct bootmem_data;
> typedef struct pglist_data {
> -/* The linkage to node_zones is now removed. The new hierarchy introduced
> - * is pg_data_t -> mem_region -> zones
> - * struct zone node_zones[MAX_NR_ZONES];
> - */
> struct zonelist node_zonelists[MAX_ZONELISTS];
> int nr_zones;
> #ifdef CONFIG_FLAT_NODE_MEM_MAP /* means !SPARSEMEM */
> - struct page *node_mem_map;
> + strs pg_data_t -> mem_region -> zones
> + * struct zone node_zones[MAX_NR_ZONES];
> + */uct page *node_mem_map;
what is time?
> #ifdef CONFIG_CGROUP_MEM_RES_CTLR
> struct page_cgroup *node_page_cgroup;
> #endif
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index da8b045..3d994e8 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -4285,6 +4285,34 @@ static inline int pageblock_default_order(unsigned int order)
>
> #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
>
> +#define REGIONS_SIZE (512 << 20) >> PAGE_SHIFT
fix a region size why?
> +
> +static void init_node_memory_regions(struct pglist_data *pgdat)
> +{
Best Regards,
J.


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