From: Dan Williams <dan.j.williams@intel.com>
To: akpm@linux-foundation.org
Cc: toshi.kani@hpe.com, Mel Gorman <mgorman@techsingularity.net>,
linux-kernel@vger.kernel.org,
Stephen Bates <stephen.bates@microsemi.com>,
linux-mm@kvack.org, Johannes Weiner <hannes@cmpxchg.org>,
Logan Gunthorpe <logang@deltatee.com>,
Vlastimil Babka <vbabka@suse.cz>
Subject: [PATCH v2 06/11] mm: fix register_new_memory() zone type detection
Date: Thu, 08 Dec 2016 18:41:26 -0800 [thread overview]
Message-ID: <148125128656.13512.9706045184718569455.stgit@dwillia2-desk3.amr.corp.intel.com> (raw)
In-Reply-To: <148125125407.13512.1253904589564772668.stgit@dwillia2-desk3.amr.corp.intel.com>
In preparation for sub-section memory hotplug support, remove a
dependency on ->section_mem_map being populated. In SPARSEMEM_VMEMMAP=y
configurations pfn_to_page() does not use ->section_mem_map. The
sub-section hotplug support relies on this fact and skips initializing
it. Without ->section_mem_map populated, or aligned to section boundary,
conversions of mem_section instances to zones is not possible.
So, this removes a false dependency on a structure field that will only
be valid in the SPARSEMEM_VMEMMAP=n case, and only used for
pfn_to_page() (and similar) operations.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: Stephen Bates <stephen.bates@microsemi.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/base/memory.c | 26 +++++++++-----------------
include/linux/memory.h | 4 ++--
mm/memory_hotplug.c | 4 ++--
3 files changed, 13 insertions(+), 21 deletions(-)
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 62c63c0c5c22..ac34f27274bf 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -687,24 +687,16 @@ static int add_memory_block(int base_section_nr)
return 0;
}
-static bool is_zone_device_section(struct mem_section *ms)
-{
- struct page *page;
-
- page = sparse_decode_mem_map(ms->section_mem_map, __section_nr(ms));
- return is_zone_device_page(page);
-}
-
/*
* need an interface for the VM to add new memory regions,
* but without onlining it.
*/
-int register_new_memory(int nid, struct mem_section *section)
+int register_new_memory(struct zone *zone, int nid, struct mem_section *section)
{
int ret = 0;
struct memory_block *mem;
- if (is_zone_device_section(section))
+ if (is_dev_zone(zone))
return 0;
mutex_lock(&mem_sysfs_mutex);
@@ -738,14 +730,11 @@ unregister_memory(struct memory_block *memory)
device_unregister(&memory->dev);
}
-static int remove_memory_section(unsigned long node_id,
- struct mem_section *section, int phys_device)
+static int remove_memory_section(struct zone *zone, unsigned long node_id,
+ struct mem_section *section, int phys_device)
{
struct memory_block *mem;
- if (is_zone_device_section(section))
- return 0;
-
mutex_lock(&mem_sysfs_mutex);
mem = find_memory_block(section);
unregister_mem_sect_under_nodes(mem, __section_nr(section));
@@ -760,12 +749,15 @@ static int remove_memory_section(unsigned long node_id,
return 0;
}
-int unregister_memory_section(struct mem_section *section)
+int unregister_memory_section(struct zone *zone, struct mem_section *section)
{
+ if (is_dev_zone(zone))
+ return 0;
+
if (!present_section(section))
return -EINVAL;
- return remove_memory_section(0, section, 0);
+ return remove_memory_section(zone, 0, section, 0);
}
#endif /* CONFIG_MEMORY_HOTREMOVE */
diff --git a/include/linux/memory.h b/include/linux/memory.h
index 093607f90b91..301dfb03ecb7 100644
--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -108,12 +108,12 @@ extern int register_memory_notifier(struct notifier_block *nb);
extern void unregister_memory_notifier(struct notifier_block *nb);
extern int register_memory_isolate_notifier(struct notifier_block *nb);
extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
-extern int register_new_memory(int, struct mem_section *);
+extern int register_new_memory(struct zone *, int, struct mem_section *);
extern int memory_block_change_state(struct memory_block *mem,
unsigned long to_state,
unsigned long from_state_req);
#ifdef CONFIG_MEMORY_HOTREMOVE
-extern int unregister_memory_section(struct mem_section *);
+extern int unregister_memory_section(struct zone *, struct mem_section *);
#endif
extern int memory_dev_init(void);
extern int memory_notify(unsigned long val, void *v);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index c7b3b2308ac3..c8b1a4926fb7 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -516,7 +516,7 @@ static int __meminit __add_section(int nid, struct zone *zone,
if (ret < 0)
return ret;
- return register_new_memory(nid, __pfn_to_section(phys_start_pfn));
+ return register_new_memory(zone, nid, __pfn_to_section(phys_start_pfn));
}
/*
@@ -785,7 +785,7 @@ static int __remove_section(struct zone *zone, struct mem_section *ms,
if (!valid_section(ms))
return ret;
- ret = unregister_memory_section(ms);
+ ret = unregister_memory_section(zone, ms);
if (ret)
return ret;
next prev parent reply other threads:[~2016-12-09 2:45 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-09 2:40 [PATCH v2 00/11] mm: sub-section memory hotplug support Dan Williams
2016-12-09 2:40 ` [PATCH v2 01/11] mm, devm_memremap_pages: use multi-order radix for ZONE_DEVICE lookups Dan Williams
2016-12-09 2:41 ` [PATCH v2 02/11] mm: introduce struct mem_section_usage to track partial population of a section Dan Williams
2016-12-09 2:41 ` [PATCH v2 03/11] mm: introduce common definitions for the size and mask " Dan Williams
2016-12-09 2:41 ` [PATCH v2 04/11] mm: cleanup sparse_init_one_section() return value Dan Williams
2016-12-09 2:41 ` [PATCH v2 05/11] mm: track active portions of a section at boot Dan Williams
2016-12-09 2:41 ` Dan Williams [this message]
2016-12-09 2:41 ` [PATCH v2 07/11] mm: convert kmalloc_section_memmap() to populate_section_memmap() Dan Williams
2016-12-09 2:41 ` [PATCH v2 08/11] mm: prepare for hot-{add, remove} of sub-section ranges Dan Williams
2016-12-09 2:41 ` [PATCH v2 09/11] mm: support section-unaligned ZONE_DEVICE memory ranges Dan Williams
2016-12-09 2:41 ` [PATCH v2 10/11] mm: enable section-unaligned devm_memremap_pages() Dan Williams
2016-12-09 2:41 ` [PATCH v2 11/11] libnvdimm, pfn, dax: stop padding pmem namespaces to section alignment Dan Williams
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