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Date: Fri, 1 Jun 2018 14:53:20 +0200
From: osalvador@...hadventures.net
To: akpm@...ux-foundation.org
Cc: mhocko@...e.com, vbabka@...e.cz, pasha.tatashin@...cle.com,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Oscar Salvador <osalvador@...e.de>
Subject: [PATCH 3/4] mm/memory_hotplug: Get rid of link_mem_sections
From: Oscar Salvador <osalvador@...e.de>
link_mem_sections() and walk_memory_range() share most of the code,
so we can use walk_memory_range() with a callback to register_mem_sect_under_node()
instead of using link_mem_sections().
To control whether the node id must be check, two new functions has been added:
register_mem_sect_under_node_nocheck_node()
and
register_mem_sect_under_node_check_node()
They both call register_mem_sect_under_node_check() with
the parameter check_nid set to true or false.
Signed-off-by: Oscar Salvador <osalvador@...e.de>
---
drivers/base/node.c | 47 ++++++++++-------------------------------------
include/linux/node.h | 21 +++++++++------------
mm/memory_hotplug.c | 8 ++++----
3 files changed, 23 insertions(+), 53 deletions(-)
diff --git a/drivers/base/node.c b/drivers/base/node.c
index a5e821d09656..248c712e8de5 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -398,6 +398,16 @@ static int __ref get_nid_for_pfn(unsigned long pfn)
return pfn_to_nid(pfn);
}
+int register_mem_sect_under_node_check_node(struct memory_block *mem_blk, void *nid)
+{
+ return register_mem_sect_under_node (mem_blk, *(int *)nid, true);
+}
+
+int register_mem_sect_under_node_nocheck_node(struct memory_block *mem_blk, void *nid)
+{
+ return register_mem_sect_under_node (mem_blk, *(int *)nid, false);
+}
+
/* register memory section under specified node if it spans that node */
int register_mem_sect_under_node(struct memory_block *mem_blk, int nid,
bool check_nid)
@@ -490,43 +500,6 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
return 0;
}
-int link_mem_sections(int nid, unsigned long start_pfn, unsigned long nr_pages,
- bool check_nid)
-{
- unsigned long end_pfn = start_pfn + nr_pages;
- unsigned long pfn;
- struct memory_block *mem_blk = NULL;
- int err = 0;
-
- for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
- unsigned long section_nr = pfn_to_section_nr(pfn);
- struct mem_section *mem_sect;
- int ret;
-
- if (!present_section_nr(section_nr))
- continue;
- mem_sect = __nr_to_section(section_nr);
-
- /* same memblock ? */
- if (mem_blk)
- if ((section_nr >= mem_blk->start_section_nr) &&
- (section_nr <= mem_blk->end_section_nr))
- continue;
-
- mem_blk = find_memory_block_hinted(mem_sect, mem_blk);
-
- ret = register_mem_sect_under_node(mem_blk, nid, check_nid);
- if (!err)
- err = ret;
-
- /* discard ref obtained in find_memory_block() */
- }
-
- if (mem_blk)
- kobject_put(&mem_blk->dev.kobj);
- return err;
-}
-
#ifdef CONFIG_HUGETLBFS
/*
* Handle per node hstate attribute [un]registration on transistions
diff --git a/include/linux/node.h b/include/linux/node.h
index 6d336e38d155..1158bea9be52 100644
--- a/include/linux/node.h
+++ b/include/linux/node.h
@@ -31,19 +31,11 @@ struct memory_block;
extern struct node *node_devices[];
typedef void (*node_registration_func_t)(struct node *);
-#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_NUMA)
-extern int link_mem_sections(int nid, unsigned long start_pfn,
- unsigned long nr_pages, bool check_nid);
-#else
-static inline int link_mem_sections(int nid, unsigned long start_pfn,
- unsigned long nr_pages, bool check_nid)
-{
- return 0;
-}
-#endif
-
extern void unregister_node(struct node *node);
#ifdef CONFIG_NUMA
+#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE)
+extern int register_mem_sect_under_node_check_node(struct memory_block *mem_blk, void *nid);
+#endif
/* Core of the node registration - only memory hotplug should use this */
extern int __register_one_node(int nid);
@@ -54,12 +46,17 @@ static inline int register_one_node(int nid)
if (node_online(nid)) {
struct pglist_data *pgdat = NODE_DATA(nid);
+ unsigned long start = pgdat->node_start_pfn;
+ unsigned long size = pgdat->node_spanned_pages;
error = __register_one_node(nid);
if (error)
return error;
/* link memory sections under this node */
- error = link_mem_sections(nid, pgdat->node_start_pfn, pgdat->node_spanned_pages, true);
+#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE)
+ error = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1),
+ (void *)&nid, register_mem_sect_under_node_check_node);
+#endif
}
return error;
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index f84ef96175ab..ac21dc506b84 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -40,6 +40,8 @@
#include "internal.h"
+extern int register_mem_sect_under_node_nocheck_node(struct memory_block *mem_blk, void *nid);
+
/*
* online_page_callback contains pointer to current page onlining function.
* Initially it is generic_online_page(). If it is required it could be
@@ -1118,7 +1120,6 @@ int __ref add_memory_resource(int nid, struct resource *res, bool online)
u64 start, size;
bool new_node;
int ret;
- unsigned long start_pfn, nr_pages;
start = res->start;
size = resource_size(res);
@@ -1157,9 +1158,8 @@ int __ref add_memory_resource(int nid, struct resource *res, bool online)
}
/* link memory sections under this node.*/
- start_pfn = start >> PAGE_SHIFT;
- nr_pages = size >> PAGE_SHIFT;
- ret = link_mem_sections(nid, start_pfn, nr_pages, false);
+ ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1),
+ (void *)&nid, register_mem_sect_under_node_nocheck_node);
if (ret)
goto register_fail;
--
2.13.6
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