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mm/demotion: add hotplug callbacks to handle new numa node onlined 

If the new NUMA node onlined doesn't have a abstract distance assigned,
the kernel adds the NUMA node to default memory tier.

[aneesh.kumar@linux.ibm.com: fix kernel error with memory hotplug]
  Link: https://lkml.kernel.org/r/20220825092019.379069-1-aneesh.kumar@linux.ibm.com
Link: https://lkml.kernel.org/r/20220818131042.113280-4-aneesh.kumar@linux.ibm.com
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Acked-by: Wei Xu <weixugc@google.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Bharata B Rao <bharata@amd.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Hesham Almatary <hesham.almatary@huawei.com>
Cc: Jagdish Gediya <jvgediya.oss@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Tim Chen <tim.c.chen@intel.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Aneesh Kumar K.V 2022-08-18 18:40:35 +05:30 committed by Andrew Morton
parent 9195244022
commit c6123a19c9
2 changed files with 69 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/memory-tiers.h
View File

@ -14,6 +14,7 @@
* the same memory tier.
*/
#define MEMTIER_ADISTANCE_DRAM ((4 * MEMTIER_CHUNK_SIZE) + (MEMTIER_CHUNK_SIZE >> 1))
#define MEMTIER_HOTPLUG_PRIO 100
#ifdef CONFIG_NUMA
#include <linux/types.h>

68
mm/memory-tiers.c
View File

@ -5,6 +5,7 @@
#include <linux/lockdep.h>
#include <linux/sysfs.h>
#include <linux/kobject.h>
#include <linux/memory.h>
#include <linux/memory-tiers.h>
struct memory_tier {
@ -105,6 +106,72 @@ static struct memory_tier *set_node_memory_tier(int node)
return memtier;
}
static struct memory_tier *__node_get_memory_tier(int node)
{
struct memory_dev_type *memtype;
memtype = node_memory_types[node];
if (memtype && node_isset(node, memtype->nodes))
return memtype->memtier;
return NULL;
}
static void destroy_memory_tier(struct memory_tier *memtier)
{
list_del(&memtier->list);
kfree(memtier);
}
static bool clear_node_memory_tier(int node)
{
bool cleared = false;
struct memory_tier *memtier;
memtier = __node_get_memory_tier(node);
if (memtier) {
struct memory_dev_type *memtype;
memtype = node_memory_types[node];
node_clear(node, memtype->nodes);
if (nodes_empty(memtype->nodes)) {
list_del_init(&memtype->tier_sibiling);
memtype->memtier = NULL;
if (list_empty(&memtier->memory_types))
destroy_memory_tier(memtier);
}
cleared = true;
}
return cleared;
}
static int __meminit memtier_hotplug_callback(struct notifier_block *self,
unsigned long action, void *_arg)
{
struct memory_notify *arg = _arg;
/*
* Only update the node migration order when a node is
* changing status, like online->offline.
*/
if (arg->status_change_nid < 0)
return notifier_from_errno(0);
switch (action) {
case MEM_OFFLINE:
mutex_lock(&memory_tier_lock);
clear_node_memory_tier(arg->status_change_nid);
mutex_unlock(&memory_tier_lock);
break;
case MEM_ONLINE:
mutex_lock(&memory_tier_lock);
set_node_memory_tier(arg->status_change_nid);
mutex_unlock(&memory_tier_lock);
break;
}
return notifier_from_errno(0);
}
static int __init memory_tier_init(void)
{
int node;
@ -126,6 +193,7 @@ static int __init memory_tier_init(void)
}
mutex_unlock(&memory_tier_lock);
hotplug_memory_notifier(memtier_hotplug_callback, MEMTIER_HOTPLUG_PRIO);
return 0;
}
subsys_initcall(memory_tier_init);