From: Andrew Morton <akpm@linux-foundation.org>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Michal Hocko <mhocko@suse.com>,
linux-nvdimm@ml01.01.org, Logan Gunthorpe <logang@deltatee.com>,
linux-kernel@vger.kernel.org,
Stephen Bates <stephen.bates@microsemi.com>,
linux-mm@kvack.org, Johannes Weiner <hannes@cmpxchg.org>,
Mel Gorman <mgorman@techsingularity.net>,
Vlastimil Babka <vbabka@suse.cz>
Subject: Re: [PATCH v3 06/12] mm: track active portions of a section at boot
Date: Thu, 19 Jan 2017 16:05:52 -0800 [thread overview]
Message-ID: <20170119160552.7bdc2e41f19bd52987a752bc@linux-foundation.org> (raw)
In-Reply-To: <148486363375.19694.14661926204436340901.stgit@dwillia2-desk3.amr.corp.intel.com>
On Thu, 19 Jan 2017 14:07:13 -0800 Dan Williams <dan.j.williams@intel.com> wrote:
> 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)).
>
> --- 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)
Using a #define for this is crappy. A static inline does typechecking
and can suppress unused-var warnings in callers.
> #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);
section_active_init() can be __init, methinks. We don't want to carry
the extra .text after boot.
--- a/include/linux/mmzone.h~mm-track-active-portions-of-a-section-at-boot-fix
+++ a/include/linux/mmzone.h
@@ -1083,7 +1083,7 @@ struct mem_section_usage {
unsigned long pageblock_flags[0];
};
-void section_active_init(unsigned long pfn, unsigned long nr_pages);
+void __init section_active_init(unsigned long pfn, unsigned long nr_pages);
struct page;
struct page_ext;
@@ -1226,6 +1226,10 @@ void sparse_init(void);
#else
#define sparse_init() do {} while (0)
#define sparse_index_init(_sec, _nid) do {} while (0)
+static inline void section_active_init(unsigned long pfn,
+ unsigned long nr_pages)
+{
+}
#define section_active_init(_pfn, _nr_pages) do {} while (0)
#endif /* CONFIG_SPARSEMEM */
--- a/mm/sparse.c~mm-track-active-portions-of-a-section-at-boot-fix
+++ a/mm/sparse.c
@@ -168,13 +168,13 @@ void __meminit mminit_validate_memmodel_
}
}
-static int section_active_index(phys_addr_t phys)
+static int __init 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)
+static unsigned long __init section_active_mask(unsigned long pfn,
+ unsigned long nr_pages)
{
int idx_start, idx_size;
phys_addr_t start, size;
@@ -195,7 +195,7 @@ static unsigned long section_active_mask
return ((1UL << idx_size) - 1) << idx_start;
}
-void section_active_init(unsigned long pfn, unsigned long nr_pages)
+void __init 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);
_
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next prev parent reply other threads:[~2017-01-20 0:05 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-19 22:06 [PATCH v3 00/12] mm: sub-section memory hotplug support Dan Williams
2017-01-19 22:06 ` [PATCH v3 01/12] mm: fix type width of section to/from pfn conversion macros Dan Williams
2017-01-19 22:06 ` [PATCH v3 02/12] mm, devm_memremap_pages: use multi-order radix for ZONE_DEVICE lookups Dan Williams
2017-01-19 22:06 ` [PATCH v3 03/12] mm: introduce struct mem_section_usage to track partial population of a section Dan Williams
2017-01-19 22:07 ` [PATCH v3 04/12] mm: introduce common definitions for the size and mask " Dan Williams
2017-01-19 22:07 ` [PATCH v3 05/12] mm: cleanup sparse_init_one_section() return value Dan Williams
2017-01-19 22:07 ` [PATCH v3 06/12] mm: track active portions of a section at boot Dan Williams
2017-01-20 0:05 ` Andrew Morton [this message]
2017-01-20 17:56 ` Dan Williams
2017-01-19 22:07 ` [PATCH v3 07/12] mm: fix register_new_memory() zone type detection Dan Williams
2017-01-19 22:07 ` [PATCH v3 08/12] mm: convert kmalloc_section_memmap() to populate_section_memmap() Dan Williams
2017-01-19 22:07 ` [PATCH v3 09/12] mm: prepare for hot-{add, remove} of sub-section ranges Dan Williams
2017-01-19 22:07 ` [PATCH v3 10/12] mm: support section-unaligned ZONE_DEVICE memory ranges Dan Williams
2017-01-19 22:07 ` [PATCH v3 11/12] mm: enable section-unaligned devm_memremap_pages() Dan Williams
2017-01-19 22:07 ` [PATCH v3 12/12] libnvdimm, pfn, dax: stop padding pmem namespaces to section alignment Dan Williams
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