[PATCH v5 0/2] sched/numa: add per-process numa_balancing

[PATCH v5 0/2] sched/numa: add per-process numa_balancing

[Gang Li]

# Introduce
Add PR_NUMA_BALANCING in prctl.

A large number of page faults will cause performance loss when numa
balancing is performing. Thus those processes which care about worst-case
performance need numa balancing disabled. Others, on the contrary, allow a
temporary performance loss in exchange for higher average performance, so
enable numa balancing is better for them.

Numa balancing can only be controlled globally by
/proc/sys/kernel/numa_balancing. Due to the above case, we want to
disable/enable numa_balancing per-process instead.

Set per-process numa balancing:
	prctl(PR_NUMA_BALANCING, PR_SET_NUMA_BALANCING_DISABLE); //disable
	prctl(PR_NUMA_BALANCING, PR_SET_NUMA_BALANCING_ENABLE);  //enable
	prctl(PR_NUMA_BALANCING, PR_SET_NUMA_BALANCING_DEFAULT); //follow global
Get numa_balancing state:
	prctl(PR_NUMA_BALANCING, PR_GET_NUMA_BALANCING, &ret);
	cat /proc/<pid>/status | grep NumaB_mode

# Unixbench multithread result
I ran benchmark 20 times, but still have measurement error. I will run
benchmark more precisely on the next version of this patchset.
+-------------------+----------+
|       NAME        | OVERHEAD |
+-------------------+----------+
| Dhrystone2        | -0.27%   |
| Whetstone         | -0.17%   |
| Execl             | -0.92%   |
| File_Copy_1024    | 0.31%    |
| File_Copy_256     | -1.96%   |
| File_Copy_4096    | 0.40%    |
| Pipe_Throughput   | -3.08%   |
| Context_Switching | -1.11%   |
| Process_Creation  | 3.24%    |
| Shell_Scripts_1   | 0.26%    |
| Shell_Scripts_8   | 0.32%    |
| System_Call       | 0.10%    |
+-------------------+----------+
| Total             | -0.21%   |
+-------------------+----------+

# Changes
Changes in v5:
- replace numab_enabled with numa_balancing_mode (Peter Zijlstra)
- make numa_balancing_enabled and numa_balancing_mode inline (Peter Zijlstra)
- use static_branch_inc/dec instead of static_branch_enable/disable (Peter Zijlstra)
- delete CONFIG_NUMA_BALANCING in task_tick_fair (Peter Zijlstra)
- reword commit, use imperative mood (Bagas Sanjaya)
- Unixbench overhead result

Changes in v4:
- code clean: add wrapper function `numa_balancing_enabled`

Changes in v3:
- Fix compile error.

Changes in v2:
- Now PR_NUMA_BALANCING support three states: enabled, disabled, default.
  enabled and disabled will ignore global setting, and default will follow
  global setting.

Gang Li (2):
  sched/numa: use static_branch_inc/dec for sched_numa_balancing
  sched/numa: add per-process numa_balancing

 Documentation/filesystems/proc.rst   |  2 ++
 fs/proc/task_mmu.c                   | 20 ++++++++++++
 include/linux/mm_types.h             |  3 ++
 include/linux/sched/numa_balancing.h | 45 ++++++++++++++++++++++++++
 include/uapi/linux/prctl.h           |  7 +++++
 kernel/fork.c                        |  4 +++
 kernel/sched/core.c                  | 26 +++++++--------
 kernel/sched/fair.c                  |  9 +++---
 kernel/sys.c                         | 47 ++++++++++++++++++++++++++++
 mm/mprotect.c                        |  6 ++--
 10 files changed, 150 insertions(+), 19 deletions(-)

-- 
2.20.1

[PATCH v5 1/2] sched/numa: use static_branch_inc/dec for sched_numa_balancing

[Gang Li]

per-process numa balancing use static_branch_inc/dec() to count
how many enables in sched_numa_balancing. So here must be converted
to inc/dec too.

Signed-off-by: Gang Li <ligang.bdlg@bytedance.com>
---
 kernel/sched/core.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index cb2aa2b54c7a..43716d107d72 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4372,21 +4372,15 @@ DEFINE_STATIC_KEY_FALSE(sched_numa_balancing);
 
 int sysctl_numa_balancing_mode;
 
-static void __set_numabalancing_state(bool enabled)
-{
-	if (enabled)
-		static_branch_enable(&sched_numa_balancing);
-	else
-		static_branch_disable(&sched_numa_balancing);
-}
-
 void set_numabalancing_state(bool enabled)
 {
-	if (enabled)
+	if (enabled) {
 		sysctl_numa_balancing_mode = NUMA_BALANCING_NORMAL;
-	else
+		static_branch_enable(&sched_numa_balancing);
+	} else {
 		sysctl_numa_balancing_mode = NUMA_BALANCING_DISABLED;
-	__set_numabalancing_state(enabled);
+		static_branch_disable(&sched_numa_balancing);
+	}
 }
 
 #ifdef CONFIG_PROC_SYSCTL
@@ -4420,8 +4414,14 @@ int sysctl_numa_balancing(struct ctl_table *table, int write,
 		if (!(sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING) &&
 		    (state & NUMA_BALANCING_MEMORY_TIERING))
 			reset_memory_tiering();
-		sysctl_numa_balancing_mode = state;
-		__set_numabalancing_state(state);
+		if (sysctl_numa_balancing_mode != state) {
+			if (state == NUMA_BALANCING_DISABLED)
+				static_branch_dec(&sched_numa_balancing);
+			else if (sysctl_numa_balancing_mode == NUMA_BALANCING_DISABLED)
+				static_branch_inc(&sched_numa_balancing);
+
+			sysctl_numa_balancing_mode = state;
+		}
 	}
 	return err;
 }
-- 
2.20.1

[PATCH v5 2/2] sched/numa: add per-process numa_balancing

[Gang Li]

Add PR_NUMA_BALANCING in prctl.

A large number of page faults will cause performance loss when numa
balancing is performing. Thus those processes which care about worst-case
performance need numa balancing disabled. Others, on the contrary, allow a
temporary performance loss in exchange for higher average performance, so
enable numa balancing is better for them.

Numa balancing can only be controlled globally by
/proc/sys/kernel/numa_balancing. Due to the above case, we want to
disable/enable numa_balancing per-process instead.

Set per-process numa balancing:
	prctl(PR_NUMA_BALANCING, PR_SET_NUMA_BALANCING_DISABLE); //disable
	prctl(PR_NUMA_BALANCING, PR_SET_NUMA_BALANCING_ENABLE);  //enable
	prctl(PR_NUMA_BALANCING, PR_SET_NUMA_BALANCING_DEFAULT); //follow global
Get numa_balancing state:
	prctl(PR_NUMA_BALANCING, PR_GET_NUMA_BALANCING, &ret);
	cat /proc/<pid>/status | grep NumaB_mode

Cc: linux-api@vger.kernel.org
Signed-off-by: Gang Li <ligang.bdlg@bytedance.com>
---
 Documentation/filesystems/proc.rst   |  2 ++
 fs/proc/task_mmu.c                   | 20 ++++++++++++
 include/linux/mm_types.h             |  3 ++
 include/linux/sched/numa_balancing.h | 45 ++++++++++++++++++++++++++
 include/uapi/linux/prctl.h           |  7 +++++
 kernel/fork.c                        |  4 +++
 kernel/sched/fair.c                  |  9 +++---
 kernel/sys.c                         | 47 ++++++++++++++++++++++++++++
 mm/mprotect.c                        |  6 ++--
 9 files changed, 137 insertions(+), 6 deletions(-)

diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index ec6cfdf1796a..e7f058c4e906 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -193,6 +193,7 @@ read the file /proc/PID/status::
   VmLib:      1412 kB
   VmPTE:        20 kb
   VmSwap:        0 kB
+  NumaB_mode:  default
   HugetlbPages:          0 kB
   CoreDumping:    0
   THP_enabled:	  1
@@ -274,6 +275,7 @@ It's slow but very precise.
  VmPTE                       size of page table entries
  VmSwap                      amount of swap used by anonymous private data
                              (shmem swap usage is not included)
+ NumaB_mode                  numa balancing mode, set by prctl(PR_NUMA_BALANCING, ...)
  HugetlbPages                size of hugetlb memory portions
  CoreDumping                 process's memory is currently being dumped
                              (killing the process may lead to a corrupted core)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 8a74cdcc9af0..835b68ec218b 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -19,6 +19,8 @@
 #include <linux/shmem_fs.h>
 #include <linux/uaccess.h>
 #include <linux/pkeys.h>
+#include <linux/sched/numa_balancing.h>
+#include <linux/prctl.h>
 
 #include <asm/elf.h>
 #include <asm/tlb.h>
@@ -75,6 +77,24 @@ void task_mem(struct seq_file *m, struct mm_struct *mm)
 		    " kB\nVmPTE:\t", mm_pgtables_bytes(mm) >> 10, 8);
 	SEQ_PUT_DEC(" kB\nVmSwap:\t", swap);
 	seq_puts(m, " kB\n");
+#ifdef CONFIG_NUMA_BALANCING
+	seq_puts(m, "NumaB_mode:\t");
+	switch (mm->numa_balancing_mode) {
+	case PR_SET_NUMA_BALANCING_DEFAULT:
+		seq_puts(m, "default");
+		break;
+	case PR_SET_NUMA_BALANCING_DISABLED:
+		seq_puts(m, "disabled");
+		break;
+	case PR_SET_NUMA_BALANCING_ENABLED:
+		seq_puts(m, "enabled");
+		break;
+	default:
+		seq_puts(m, "unknown");
+		break;
+	}
+	seq_putc(m, '\n');
+#endif
 	hugetlb_report_usage(m, mm);
 }
 #undef SEQ_PUT_DEC
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index a82f06ab18a1..b789acf1f69c 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -679,6 +679,9 @@ struct mm_struct {
 
 		/* numa_scan_seq prevents two threads remapping PTEs. */
 		int numa_scan_seq;
+
+		/* Controls whether NUMA balancing is active for this mm. */
+		int numa_balancing_mode;
 #endif
 		/*
 		 * An operation with batched TLB flushing is going on. Anything
diff --git a/include/linux/sched/numa_balancing.h b/include/linux/sched/numa_balancing.h
index 3988762efe15..aa8629dfde45 100644
--- a/include/linux/sched/numa_balancing.h
+++ b/include/linux/sched/numa_balancing.h
@@ -8,6 +8,8 @@
  */
 
 #include <linux/sched.h>
+#include <linux/sched/sysctl.h>
+#include <linux/prctl.h>
 
 #define TNF_MIGRATED	0x01
 #define TNF_NO_GROUP	0x02
@@ -16,12 +18,47 @@
 #define TNF_MIGRATE_FAIL 0x10
 
 #ifdef CONFIG_NUMA_BALANCING
+DECLARE_STATIC_KEY_FALSE(sched_numa_balancing);
 extern void task_numa_fault(int last_node, int node, int pages, int flags);
 extern pid_t task_numa_group_id(struct task_struct *p);
 extern void set_numabalancing_state(bool enabled);
 extern void task_numa_free(struct task_struct *p, bool final);
 extern bool should_numa_migrate_memory(struct task_struct *p, struct page *page,
 					int src_nid, int dst_cpu);
+static inline bool numa_balancing_enabled(struct task_struct *p)
+{
+	if (!static_branch_unlikely(&sched_numa_balancing))
+		return false;
+
+	if (p->mm) switch (p->mm->numa_balancing_mode) {
+	case PR_SET_NUMA_BALANCING_ENABLED:
+		return true;
+	case PR_SET_NUMA_BALANCING_DISABLED:
+		return false;
+	default:
+		break;
+	}
+
+	return sysctl_numa_balancing_mode;
+}
+static inline int numa_balancing_mode(struct mm_struct *mm)
+{
+	if (!static_branch_unlikely(&sched_numa_balancing))
+		return PR_SET_NUMA_BALANCING_DISABLED;
+
+	if (mm) switch (mm->numa_balancing_mode) {
+	case PR_SET_NUMA_BALANCING_ENABLED:
+		return sysctl_numa_balancing_mode == NUMA_BALANCING_DISABLED ?
+			NUMA_BALANCING_NORMAL : sysctl_numa_balancing_mode;
+	case PR_SET_NUMA_BALANCING_DISABLED:
+		return NUMA_BALANCING_DISABLED;
+	case PR_SET_NUMA_BALANCING_DEFAULT:
+	default:
+		break;
+	}
+
+	return sysctl_numa_balancing_mode;
+}
 #else
 static inline void task_numa_fault(int last_node, int node, int pages,
 				   int flags)
@@ -42,6 +79,14 @@ static inline bool should_numa_migrate_memory(struct task_struct *p,
 {
 	return true;
 }
+static inline int numa_balancing_mode(struct mm_struct *mm)
+{
+	return 0;
+}
+static inline bool numa_balancing_enabled(struct task_struct *p)
+{
+	return 0;
+}
 #endif
 
 #endif /* _LINUX_SCHED_NUMA_BALANCING_H */
diff --git a/include/uapi/linux/prctl.h b/include/uapi/linux/prctl.h
index a5e06dcbba13..25477fe0b4ef 100644
--- a/include/uapi/linux/prctl.h
+++ b/include/uapi/linux/prctl.h
@@ -284,4 +284,11 @@ struct prctl_mm_map {
 #define PR_SET_VMA		0x53564d41
 # define PR_SET_VMA_ANON_NAME		0
 
+/* Set/get enabled per-process numa_balancing */
+#define PR_NUMA_BALANCING		65
+# define PR_SET_NUMA_BALANCING_DISABLED	0
+# define PR_SET_NUMA_BALANCING_ENABLED	1
+# define PR_SET_NUMA_BALANCING_DEFAULT	2
+# define PR_GET_NUMA_BALANCING		3
+
 #endif /* _LINUX_PRCTL_H */
diff --git a/kernel/fork.c b/kernel/fork.c
index cfb09ca1b1bc..7811fa5e098d 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -97,6 +97,7 @@
 #include <linux/scs.h>
 #include <linux/io_uring.h>
 #include <linux/bpf.h>
+#include <linux/prctl.h>
 
 #include <asm/pgalloc.h>
 #include <linux/uaccess.h>
@@ -1133,6 +1134,9 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
 	init_tlb_flush_pending(mm);
 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS
 	mm->pmd_huge_pte = NULL;
+#endif
+#ifdef CONFIG_NUMA_BALANCING
+	mm->numa_balancing_mode = PR_SET_NUMA_BALANCING_DEFAULT;
 #endif
 	mm_init_uprobes_state(mm);
 	hugetlb_count_init(mm);
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e4a0b8bd941c..94fd6f48fd45 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -47,6 +47,7 @@
 #include <linux/psi.h>
 #include <linux/ratelimit.h>
 #include <linux/task_work.h>
+#include <linux/prctl.h>
 
 #include <asm/switch_to.h>
 
@@ -2830,7 +2831,7 @@ void task_numa_fault(int last_cpupid, int mem_node, int pages, int flags)
 	struct numa_group *ng;
 	int priv;
 
-	if (!static_branch_likely(&sched_numa_balancing))
+	if (!numa_balancing_enabled(p))
 		return;
 
 	/* for example, ksmd faulting in a user's mm */
@@ -3151,7 +3152,7 @@ static void update_scan_period(struct task_struct *p, int new_cpu)
 	int src_nid = cpu_to_node(task_cpu(p));
 	int dst_nid = cpu_to_node(new_cpu);
 
-	if (!static_branch_likely(&sched_numa_balancing))
+	if (!numa_balancing_enabled(p))
 		return;
 
 	if (!p->mm || !p->numa_faults || (p->flags & PF_EXITING))
@@ -7996,7 +7997,7 @@ static int migrate_degrades_locality(struct task_struct *p, struct lb_env *env)
 	unsigned long src_weight, dst_weight;
 	int src_nid, dst_nid, dist;
 
-	if (!static_branch_likely(&sched_numa_balancing))
+	if (!numa_balancing_enabled(p))
 		return -1;
 
 	if (!p->numa_faults || !(env->sd->flags & SD_NUMA))
@@ -11584,7 +11585,7 @@ static void task_tick_fair(struct rq *rq, struct task_struct *curr, int queued)
 		entity_tick(cfs_rq, se, queued);
 	}
 
-	if (static_branch_unlikely(&sched_numa_balancing))
+	if (numa_balancing_enabled(curr))
 		task_tick_numa(rq, curr);
 
 	update_misfit_status(curr, rq);
diff --git a/kernel/sys.c b/kernel/sys.c
index 5fd54bf0e886..f683fb065bc7 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -60,6 +60,7 @@
 #include <linux/sched/coredump.h>
 #include <linux/sched/task.h>
 #include <linux/sched/cputime.h>
+#include <linux/sched/numa_balancing.h>
 #include <linux/rcupdate.h>
 #include <linux/uidgid.h>
 #include <linux/cred.h>
@@ -2104,6 +2105,35 @@ static int prctl_set_auxv(struct mm_struct *mm, unsigned long addr,
 	return 0;
 }
 
+#ifdef CONFIG_NUMA_BALANCING
+static int prctl_pid_numa_balancing_write(int numa_balancing)
+{
+	int old_numa_balancing;
+
+	if (numa_balancing != PR_SET_NUMA_BALANCING_DEFAULT &&
+	    numa_balancing != PR_SET_NUMA_BALANCING_DISABLED &&
+	    numa_balancing != PR_SET_NUMA_BALANCING_ENABLED)
+		return -EINVAL;
+
+	old_numa_balancing = xchg(&current->mm->numa_balancing_mode, numa_balancing);
+
+	if (numa_balancing == old_numa_balancing)
+		return 0;
+
+	if (numa_balancing == 1)
+		static_branch_inc(&sched_numa_balancing);
+	else if (old_numa_balancing == 1)
+		static_branch_dec(&sched_numa_balancing);
+
+	return 0;
+}
+
+static int prctl_pid_numa_balancing_read(void)
+{
+	return current->mm->numa_balancing_mode;
+}
+#endif
+
 static int prctl_set_mm(int opt, unsigned long addr,
 			unsigned long arg4, unsigned long arg5)
 {
@@ -2618,6 +2648,23 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
 		error = set_syscall_user_dispatch(arg2, arg3, arg4,
 						  (char __user *) arg5);
 		break;
+#ifdef CONFIG_NUMA_BALANCING
+	case PR_NUMA_BALANCING:
+		switch (arg2) {
+		case PR_SET_NUMA_BALANCING_DEFAULT:
+		case PR_SET_NUMA_BALANCING_DISABLED:
+		case PR_SET_NUMA_BALANCING_ENABLED:
+			error = prctl_pid_numa_balancing_write((int)arg2);
+			break;
+		case PR_GET_NUMA_BALANCING:
+			error = put_user(prctl_pid_numa_balancing_read(), (int __user *)arg3);
+			break;
+		default:
+			error = -EINVAL;
+			break;
+		}
+		break;
+#endif
 #ifdef CONFIG_SCHED_CORE
 	case PR_SCHED_CORE:
 		error = sched_core_share_pid(arg2, arg3, arg4, arg5);
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 99762403cc8f..968a389467d5 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -30,6 +30,7 @@
 #include <linux/mm_inline.h>
 #include <linux/pgtable.h>
 #include <linux/sched/sysctl.h>
+#include <linux/sched/numa_balancing.h>
 #include <linux/userfaultfd_k.h>
 #include <linux/memory-tiers.h>
 #include <asm/cacheflush.h>
@@ -158,10 +159,11 @@ static unsigned long change_pte_range(struct mmu_gather *tlb,
 				 * Skip scanning top tier node if normal numa
 				 * balancing is disabled
 				 */
-				if (!(sysctl_numa_balancing_mode & NUMA_BALANCING_NORMAL) &&
+				if (!(numa_balancing_mode(vma->vm_mm) & NUMA_BALANCING_NORMAL) &&
 				    toptier)
 					continue;
-				if (sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING &&
+				if (numa_balancing_mode(vma->vm_mm) &
+				    NUMA_BALANCING_MEMORY_TIERING &&
 				    !toptier)
 					xchg_page_access_time(page,
 						jiffies_to_msecs(jiffies));
-- 
2.20.1

Re: [PATCH v5 0/2] sched/numa: add per-process numa_balancing

[John Hubbard]

On 10/26/22 19:53, Gang Li wrote:
> # Introduce
> Add PR_NUMA_BALANCING in prctl.
> 
> A large number of page faults will cause performance loss when numa
> balancing is performing. Thus those processes which care about worst-case
> performance need numa balancing disabled. Others, on the contrary, allow a
> temporary performance loss in exchange for higher average performance, so
> enable numa balancing is better for them.
> 
> Numa balancing can only be controlled globally by
> /proc/sys/kernel/numa_balancing. Due to the above case, we want to
> disable/enable numa_balancing per-process instead.

Hi Gang Li,

Wow, it feels like I'm getting a Christmas present early, this is great
news!

This feature is something we've always wanted for GPUs and Compute
Accelerators, too. Because what happens there is: we might have GPUs in
the system that have mapped CPU memory into their page tables. When
autonuma unmaps the CPU ptes, this triggers (via mmu invalidate
callbacks) an unmapping on each GPU. But GPU mapping and unmapping is
far heavier weight than the corresponding CPU operations.

And so for things such as OpenCL apps that run on a GPU, the only viable
approach is to somehow disable autonuma balancing. And until your series
here, that was a system wide setting, which leads to not being able to
ever have things set up "right", without constantly intervening at the
sysadmin level.

So for the series, please feel free to add:

Acked-by: John Hubbard <jhubbard@nvidia.com>

thanks,
-- 
John Hubbard
NVIDIA

> 
> Set per-process numa balancing:
> 	prctl(PR_NUMA_BALANCING, PR_SET_NUMA_BALANCING_DISABLE); //disable
> 	prctl(PR_NUMA_BALANCING, PR_SET_NUMA_BALANCING_ENABLE);  //enable
> 	prctl(PR_NUMA_BALANCING, PR_SET_NUMA_BALANCING_DEFAULT); //follow global
> Get numa_balancing state:
> 	prctl(PR_NUMA_BALANCING, PR_GET_NUMA_BALANCING, &ret);
> 	cat /proc/<pid>/status | grep NumaB_mode
> 
> # Unixbench multithread result
> I ran benchmark 20 times, but still have measurement error. I will run
> benchmark more precisely on the next version of this patchset.
> +-------------------+----------+
> |       NAME        | OVERHEAD |
> +-------------------+----------+
> | Dhrystone2        | -0.27%   |
> | Whetstone         | -0.17%   |
> | Execl             | -0.92%   |
> | File_Copy_1024    | 0.31%    |
> | File_Copy_256     | -1.96%   |
> | File_Copy_4096    | 0.40%    |
> | Pipe_Throughput   | -3.08%   |
> | Context_Switching | -1.11%   |
> | Process_Creation  | 3.24%    |
> | Shell_Scripts_1   | 0.26%    |
> | Shell_Scripts_8   | 0.32%    |
> | System_Call       | 0.10%    |
> +-------------------+----------+
> | Total             | -0.21%   |
> +-------------------+----------+
> 
> # Changes
> Changes in v5:
> - replace numab_enabled with numa_balancing_mode (Peter Zijlstra)
> - make numa_balancing_enabled and numa_balancing_mode inline (Peter Zijlstra)
> - use static_branch_inc/dec instead of static_branch_enable/disable (Peter Zijlstra)
> - delete CONFIG_NUMA_BALANCING in task_tick_fair (Peter Zijlstra)
> - reword commit, use imperative mood (Bagas Sanjaya)
> - Unixbench overhead result
> 
> Changes in v4:
> - code clean: add wrapper function `numa_balancing_enabled`
> 
> Changes in v3:
> - Fix compile error.
> 
> Changes in v2:
> - Now PR_NUMA_BALANCING support three states: enabled, disabled, default.
>    enabled and disabled will ignore global setting, and default will follow
>    global setting.
> 
> Gang Li (2):
>    sched/numa: use static_branch_inc/dec for sched_numa_balancing
>    sched/numa: add per-process numa_balancing
> 
>   Documentation/filesystems/proc.rst   |  2 ++
>   fs/proc/task_mmu.c                   | 20 ++++++++++++
>   include/linux/mm_types.h             |  3 ++
>   include/linux/sched/numa_balancing.h | 45 ++++++++++++++++++++++++++
>   include/uapi/linux/prctl.h           |  7 +++++
>   kernel/fork.c                        |  4 +++
>   kernel/sched/core.c                  | 26 +++++++--------
>   kernel/sched/fair.c                  |  9 +++---
>   kernel/sys.c                         | 47 ++++++++++++++++++++++++++++
>   mm/mprotect.c                        |  6 ++--
>   10 files changed, 150 insertions(+), 19 deletions(-)
> 

Re: [PATCH v5 0/2] sched/numa: add per-process numa_balancing

[John Hubbard]

Hi Gang Li,

If you want this to move forward, you'll likely need to include the
original To: and Cc: people. And also, any new ones who responded with
review comments. I've added here, those that I found in your v4 series
[1].

The message that I'm replying to appears to only be sent to a couple of
generic lists, and so it's going to be invisible to most of those
people.

Also, I already acked this series separately [2], before I saw the
missing Cc's.

[1] https://lore.kernel.org/all/20220929064359.46932-1-ligang.bdlg@bytedance.com/

[2] https://lore.kernel.org/all/49ed07b1-e167-7f94-9986-8e86fb60bb09@nvidia.com/

thanks,
-- 
John Hubbard
NVIDIA