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| author | Dan Williams | 2016-01-16 01:56:22 +0100 |
|---|---|---|
| committer | Linus Torvalds | 2016-01-16 02:56:32 +0100 |
| commit | 4b94ffdc4163bae1ec73b6e977ffb7a7da3d06d3 (patch) | |
| tree | f653da252999e8c1f45a2c7ae18fb1c241b4a300 /mm/page_alloc.c | |
| parent | mm: introduce find_dev_pagemap() (diff) | |
| download | kernel-qcow2-linux-4b94ffdc4163bae1ec73b6e977ffb7a7da3d06d3.tar.gz kernel-qcow2-linux-4b94ffdc4163bae1ec73b6e977ffb7a7da3d06d3.tar.xz kernel-qcow2-linux-4b94ffdc4163bae1ec73b6e977ffb7a7da3d06d3.zip | |
x86, mm: introduce vmem_altmap to augment vmemmap_populate()
In support of providing struct page for large persistent memory
capacities, use struct vmem_altmap to change the default policy for
allocating memory for the memmap array. The default vmemmap_populate()
allocates page table storage area from the page allocator. Given
persistent memory capacities relative to DRAM it may not be feasible to
store the memmap in 'System Memory'. Instead vmem_altmap represents
pre-allocated "device pages" to satisfy vmemmap_alloc_block_buf()
requests.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reported-by: kbuild test robot <lkp@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 25409714160e..7ca3fe6ef92d 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -43,6 +43,7 @@ #include <linux/vmalloc.h> #include <linux/vmstat.h> #include <linux/mempolicy.h> +#include <linux/memremap.h> #include <linux/stop_machine.h> #include <linux/sort.h> #include <linux/pfn.h> @@ -4485,8 +4486,9 @@ static inline unsigned long wait_table_bits(unsigned long size) void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, unsigned long start_pfn, enum memmap_context context) { - pg_data_t *pgdat = NODE_DATA(nid); + struct vmem_altmap *altmap = to_vmem_altmap(__pfn_to_phys(start_pfn)); unsigned long end_pfn = start_pfn + size; + pg_data_t *pgdat = NODE_DATA(nid); unsigned long pfn; struct zone *z; unsigned long nr_initialised = 0; @@ -4494,6 +4496,13 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, if (highest_memmap_pfn < end_pfn - 1) highest_memmap_pfn = end_pfn - 1; + /* + * Honor reservation requested by the driver for this ZONE_DEVICE + * memory + */ + if (altmap && start_pfn == altmap->base_pfn) + start_pfn += altmap->reserve; + z = &pgdat->node_zones[zone]; for (pfn = start_pfn; pfn < end_pfn; pfn++) { /* |