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Date: Thu, 19 Jan 2017 14:07:13 -0800 From: Dan Williams <dan.j.williams@...el.com> To: akpm@...ux-foundation.org Cc: Michal Hocko <mhocko@...e.com>, linux-nvdimm@...ts.01.org, Logan Gunthorpe <logang@...tatee.com>, linux-kernel@...r.kernel.org, Stephen Bates <stephen.bates@...rosemi.com>, linux-mm@...ck.org, Johannes Weiner <hannes@...xchg.org>, Mel Gorman <mgorman@...hsingularity.net>, Vlastimil Babka <vbabka@...e.cz> Subject: [PATCH v3 06/12] mm: track active portions of a section at boot Prepare for hot{plug,remove} of sub-ranges of a section by tracking a section active bitmask, each bit representing 2MB (SECTION_SIZE (128M) / map_active bitmask length (64)). Cc: Michal Hocko <mhocko@...e.com> Cc: Vlastimil Babka <vbabka@...e.cz> Cc: Johannes Weiner <hannes@...xchg.org> Cc: Logan Gunthorpe <logang@...tatee.com> Cc: Mel Gorman <mgorman@...hsingularity.net> Cc: Andrew Morton <akpm@...ux-foundation.org> Cc: Stephen Bates <stephen.bates@...rosemi.com> Signed-off-by: Dan Williams <dan.j.williams@...el.com> --- include/linux/mmzone.h | 3 +++ mm/page_alloc.c | 4 +++- mm/sparse.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 59 insertions(+), 1 deletion(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index aa37e2e860ed..6b9d44ce1e2e 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -1083,6 +1083,8 @@ struct mem_section_usage { unsigned long pageblock_flags[0]; }; +void section_active_init(unsigned long pfn, unsigned long nr_pages); + struct page; struct page_ext; struct mem_section { @@ -1224,6 +1226,7 @@ void sparse_init(void); #else #define sparse_init() do {} while (0) #define sparse_index_init(_sec, _nid) do {} while (0) +#define section_active_init(_pfn, _nr_pages) do {} while (0) #endif /* CONFIG_SPARSEMEM */ /* diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 68ccf5bcdbb2..9a3ab6c245a8 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -6352,10 +6352,12 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn) /* Print out the early node map */ pr_info("Early memory node ranges\n"); - for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) + for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) { pr_info(" node %3d: [mem %#018Lx-%#018Lx]\n", nid, (u64)start_pfn << PAGE_SHIFT, ((u64)end_pfn << PAGE_SHIFT) - 1); + section_active_init(start_pfn, end_pfn - start_pfn); + } /* Initialise every node */ mminit_verify_pageflags_layout(); diff --git a/mm/sparse.c b/mm/sparse.c index 59966a3e8ff0..00fdb5d04680 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -168,6 +168,59 @@ void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn, } } +static int section_active_index(phys_addr_t phys) +{ + return (phys & ~(PA_SECTION_MASK)) / SECTION_ACTIVE_SIZE; +} + +static unsigned long section_active_mask(unsigned long pfn, + unsigned long nr_pages) +{ + int idx_start, idx_size; + phys_addr_t start, size; + + if (!nr_pages) + return 0; + + start = PFN_PHYS(pfn); + size = PFN_PHYS(min(nr_pages, PAGES_PER_SECTION + - (pfn & ~PAGE_SECTION_MASK))); + size = ALIGN(size, SECTION_ACTIVE_SIZE); + + idx_start = section_active_index(start); + idx_size = section_active_index(size); + + if (idx_size == 0) + return -1; + return ((1UL << idx_size) - 1) << idx_start; +} + +void section_active_init(unsigned long pfn, unsigned long nr_pages) +{ + int end_sec = pfn_to_section_nr(pfn + nr_pages - 1); + int i, start_sec = pfn_to_section_nr(pfn); + + if (!nr_pages) + return; + + for (i = start_sec; i <= end_sec; i++) { + struct mem_section *ms; + unsigned long mask; + unsigned long pfns; + + pfns = min(nr_pages, PAGES_PER_SECTION + - (pfn & ~PAGE_SECTION_MASK)); + mask = section_active_mask(pfn, pfns); + + ms = __nr_to_section(i); + pr_debug("%s: sec: %d mask: %#018lx\n", __func__, i, mask); + ms->usage->map_active = mask; + + pfn += pfns; + nr_pages -= pfns; + } +} + /* Record a memory area against a node. */ void __init memory_present(int nid, unsigned long start, unsigned long end) {
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