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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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