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Date: Wed, 15 Aug 2018 15:21:35 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: osalvador@...hadventures.net
Cc: mhocko@...e.com, vbabka@...e.cz, pasha.tatashin@...cle.com,
Jonathan.Cameron@...wei.com, arbab@...ux.vnet.ibm.com,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Oscar Salvador <osalvador@...e.de>
Subject: Re: [PATCH v2 3/4] mm/memory_hotplug: Make
register_mem_sect_under_node a cb of walk_memory_range
On Fri, 22 Jun 2018 13:18:38 +0200 osalvador@...hadventures.net wrote:
> From: Oscar Salvador <osalvador@...e.de>
>
> link_mem_sections() and walk_memory_range() share most of the code,
> so we can use convert link_mem_sections() into a dummy function that calls
> walk_memory_range() with a callback to register_mem_sect_under_node().
>
> This patch converts register_mem_sect_under_node() in order to
> match a walk_memory_range's callback, getting rid of the
> check_nid argument and checking instead if the system is still
> boothing, since we only have to check for the nid if the system
> is in such state.
>
> Signed-off-by: Oscar Salvador <osalvador@...e.de>
> Suggested-by: Pavel Tatashin <pasha.tatashin@...cle.com>
We have two tested-by's bu no reviewers or ackers?
From: Oscar Salvador <osalvador@...e.de>
Subject: mm/memory_hotplug.c: make register_mem_sect_under_node() a callback of walk_memory_range()
link_mem_sections() and walk_memory_range() share most of the code, so we
can use convert link_mem_sections() into a dummy function that calls
walk_memory_range() with a callback to register_mem_sect_under_node().
This patch converts register_mem_sect_under_node() in order to match a
walk_memory_range's callback, getting rid of the check_nid argument and
checking instead if the system is still boothing, since we only have to
check for the nid if the system is in such state.
Link: http://lkml.kernel.org/r/20180622111839.10071-4-osalvador@techadventures.net
Signed-off-by: Oscar Salvador <osalvador@...e.de>
Suggested-by: Pavel Tatashin <pasha.tatashin@...cle.com>
Tested-by: Reza Arbab <arbab@...ux.vnet.ibm.com>
Tested-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
drivers/base/node.c | 44 +++++------------------------------------
include/linux/node.h | 12 ++++++-----
mm/memory_hotplug.c | 5 ----
3 files changed, 14 insertions(+), 47 deletions(-)
--- a/drivers/base/node.c~mm-memory_hotplug-make-register_mem_sect_under_node-a-cb-of-walk_memory_range
+++ a/drivers/base/node.c
@@ -399,10 +399,9 @@ static int __ref get_nid_for_pfn(unsigne
}
/* 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)
+int register_mem_sect_under_node(struct memory_block *mem_blk, void *arg)
{
- int ret;
+ int ret, nid = *(int *)arg;
unsigned long pfn, sect_start_pfn, sect_end_pfn;
if (!mem_blk)
@@ -433,7 +432,7 @@ int register_mem_sect_under_node(struct
* case, during hotplug we know that all pages in the memory
* block belong to the same node.
*/
- if (check_nid) {
+ if (system_state == SYSTEM_BOOTING) {
page_nid = get_nid_for_pfn(pfn);
if (page_nid < 0)
continue;
@@ -490,41 +489,10 @@ int unregister_mem_sect_under_nodes(stru
return 0;
}
-int link_mem_sections(int nid, unsigned long start_pfn, unsigned long nr_pages,
- bool check_nid)
+int link_mem_sections(int nid, unsigned long start_pfn, unsigned long end_pfn)
{
- 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;
+ return walk_memory_range(start_pfn, end_pfn, (void *)&nid,
+ register_mem_sect_under_node);
}
#ifdef CONFIG_HUGETLBFS
--- a/include/linux/node.h~mm-memory_hotplug-make-register_mem_sect_under_node-a-cb-of-walk_memory_range
+++ a/include/linux/node.h
@@ -33,10 +33,10 @@ typedef void (*node_registration_func_t
#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);
+ unsigned long end_pfn);
#else
static inline int link_mem_sections(int nid, unsigned long start_pfn,
- unsigned long nr_pages, bool check_nid)
+ unsigned long end_pfn)
{
return 0;
}
@@ -54,12 +54,14 @@ static inline int register_one_node(int
if (node_online(nid)) {
struct pglist_data *pgdat = NODE_DATA(nid);
+ unsigned long start_pfn = pgdat->node_start_pfn;
+ unsigned long end_pfn = start_pfn + 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);
+ error = link_mem_sections(nid, start_pfn, end_pfn);
}
return error;
@@ -69,7 +71,7 @@ extern void unregister_one_node(int nid)
extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
extern int register_mem_sect_under_node(struct memory_block *mem_blk,
- int nid, bool check_nid);
+ void *arg);
extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
unsigned long phys_index);
@@ -99,7 +101,7 @@ static inline int unregister_cpu_under_n
return 0;
}
static inline int register_mem_sect_under_node(struct memory_block *mem_blk,
- int nid, bool check_nid)
+ void *arg)
{
return 0;
}
--- a/mm/memory_hotplug.c~mm-memory_hotplug-make-register_mem_sect_under_node-a-cb-of-walk_memory_range
+++ a/mm/memory_hotplug.c
@@ -1123,7 +1123,6 @@ int __ref add_memory_resource(int nid, s
u64 start, size;
bool new_node = false;
int ret;
- unsigned long start_pfn, nr_pages;
start = res->start;
size = resource_size(res);
@@ -1164,9 +1163,7 @@ int __ref add_memory_resource(int nid, s
}
/* 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 = link_mem_sections(nid, PFN_DOWN(start), PFN_UP(start + size - 1));
BUG_ON(ret);
/* create new memmap entry */
_
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