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Message-Id: <20220720025920.1373558-9-aneesh.kumar@linux.ibm.com>
Date: Wed, 20 Jul 2022 08:29:20 +0530
From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To: linux-mm@...ck.org, akpm@...ux-foundation.org
Cc: Wei Xu <weixugc@...gle.com>, Huang Ying <ying.huang@...el.com>,
Yang Shi <shy828301@...il.com>,
Davidlohr Bueso <dave@...olabs.net>,
Tim C Chen <tim.c.chen@...el.com>,
Michal Hocko <mhocko@...nel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Hesham Almatary <hesham.almatary@...wei.com>,
Dave Hansen <dave.hansen@...el.com>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Alistair Popple <apopple@...dia.com>,
Dan Williams <dan.j.williams@...el.com>,
Johannes Weiner <hannes@...xchg.org>, jvgediya.oss@...il.com,
"Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Subject: [PATCH v10 8/8] mm/demotion: Update node_is_toptier to work with memory tiers
With memory tiers support we can have memory only NUMA nodes
in the top tier from which we want to avoid promotion tracking NUMA
faults. Update node_is_toptier to work with memory tiers.
All NUMA nodes are by default top tier nodes. With lower memory
tiers added we consider all memory tiers above a memory tier having
CPU NUMA nodes as a top memory tier
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
---
include/linux/memory-tiers.h | 11 +++++++++
include/linux/node.h | 5 -----
mm/huge_memory.c | 1 +
mm/memory-tiers.c | 43 ++++++++++++++++++++++++++++++++++++
mm/migrate.c | 1 +
mm/mprotect.c | 1 +
6 files changed, 57 insertions(+), 5 deletions(-)
diff --git a/include/linux/memory-tiers.h b/include/linux/memory-tiers.h
index 0e58588fa066..085dd815bf73 100644
--- a/include/linux/memory-tiers.h
+++ b/include/linux/memory-tiers.h
@@ -20,6 +20,7 @@ extern bool numa_demotion_enabled;
#ifdef CONFIG_MIGRATION
int next_demotion_node(int node);
void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *targets);
+bool node_is_toptier(int node);
#else
static inline int next_demotion_node(int node)
{
@@ -30,6 +31,11 @@ static inline void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *target
{
*targets = NODE_MASK_NONE;
}
+
+static inline bool node_is_toptier(int node)
+{
+ return true;
+}
#endif
#else
@@ -44,5 +50,10 @@ static inline void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *target
{
*targets = NODE_MASK_NONE;
}
+
+static inline bool node_is_toptier(int node)
+{
+ return true;
+}
#endif /* CONFIG_NUMA */
#endif /* _LINUX_MEMORY_TIERS_H */
diff --git a/include/linux/node.h b/include/linux/node.h
index a2a16d4104fd..d0432db18094 100644
--- a/include/linux/node.h
+++ b/include/linux/node.h
@@ -191,9 +191,4 @@ static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
#define to_node(device) container_of(device, struct node, dev)
-static inline bool node_is_toptier(int node)
-{
- return node_state(node, N_CPU);
-}
-
#endif /* _LINUX_NODE_H_ */
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 834f288b3769..8405662646e9 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -35,6 +35,7 @@
#include <linux/numa.h>
#include <linux/page_owner.h>
#include <linux/sched/sysctl.h>
+#include <linux/memory-tiers.h>
#include <asm/tlb.h>
#include <asm/pgalloc.h>
diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c
index 4a96e4213d66..f0515bfd4051 100644
--- a/mm/memory-tiers.c
+++ b/mm/memory-tiers.c
@@ -13,6 +13,7 @@
struct memory_tier {
struct list_head list;
+ int id;
int perf_level;
nodemask_t nodelist;
nodemask_t lower_tier_mask;
@@ -26,6 +27,7 @@ static LIST_HEAD(memory_tiers);
static DEFINE_MUTEX(memory_tier_lock);
#ifdef CONFIG_MIGRATION
+static int top_tier_id;
/*
* node_demotion[] examples:
*
@@ -129,6 +131,7 @@ static struct memory_tier *find_create_memory_tier(unsigned int perf_level)
if (!new_memtier)
return ERR_PTR(-ENOMEM);
+ new_memtier->id = perf_level >> MEMTIER_CHUNK_BITS;
new_memtier->perf_level = perf_level;
if (found_slot)
list_add_tail(&new_memtier->list, ent);
@@ -154,6 +157,31 @@ static struct memory_tier *__node_get_memory_tier(int node)
}
#ifdef CONFIG_MIGRATION
+bool node_is_toptier(int node)
+{
+ bool toptier;
+ pg_data_t *pgdat;
+ struct memory_tier *memtier;
+
+ pgdat = NODE_DATA(node);
+ if (!pgdat)
+ return false;
+
+ rcu_read_lock();
+ memtier = rcu_dereference(pgdat->memtier);
+ if (!memtier) {
+ toptier = true;
+ goto out;
+ }
+ if (memtier->id >= top_tier_id)
+ toptier = true;
+ else
+ toptier = false;
+out:
+ rcu_read_unlock();
+ return toptier;
+}
+
void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *targets)
{
struct memory_tier *memtier;
@@ -304,6 +332,21 @@ static void establish_migration_targets(void)
}
} while (1);
}
+ /*
+ * Promotion is allowed from a memory tier to higher
+ * memory tier only if the memory tier doesn't include
+ * compute. We want to skip promotion from a memory tier,
+ * if any node that is part of the memory tier have CPUs.
+ * Once we detect such a memory tier, we consider that tier
+ * as top tiper from which promotion is not allowed.
+ */
+ list_for_each_entry_reverse(memtier, &memory_tiers, list) {
+ nodes_and(used, node_states[N_CPU], memtier->nodelist);
+ if (!nodes_empty(used)) {
+ top_tier_id = memtier->id;
+ break;
+ }
+ }
/*
* Now build the lower_tier mask for each node collecting node mask from
* all memory tier below it. This allows us to fallback demotion page
diff --git a/mm/migrate.c b/mm/migrate.c
index c758c9c21d7d..1da81136eaaa 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -50,6 +50,7 @@
#include <linux/memory.h>
#include <linux/random.h>
#include <linux/sched/sysctl.h>
+#include <linux/memory-tiers.h>
#include <asm/tlbflush.h>
diff --git a/mm/mprotect.c b/mm/mprotect.c
index ba5592655ee3..92a2fc0fa88b 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -31,6 +31,7 @@
#include <linux/pgtable.h>
#include <linux/sched/sysctl.h>
#include <linux/userfaultfd_k.h>
+#include <linux/memory-tiers.h>
#include <asm/cacheflush.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
--
2.36.1
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