linux-kernel - [PATCH v5 0/2] sched/numa: add statistics of numa balance task migration

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Message-Id: <cover.1748002400.git.yu.c.chen@intel.com>
Date: Fri, 23 May 2025 20:48:02 +0800
From: Chen Yu <yu.c.chen@...el.com>
To: peterz@...radead.org,
	akpm@...ux-foundation.org
Cc: mkoutny@...e.com,
	mingo@...hat.com,
	tj@...nel.org,
	hannes@...xchg.org,
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	muchun.song@...ux.dev,
	roman.gushchin@...ux.dev,
	shakeel.butt@...ux.dev,
	tim.c.chen@...el.com,
	aubrey.li@...el.com,
	libo.chen@...cle.com,
	kprateek.nayak@....com,
	vineethr@...ux.ibm.com,
	venkat88@...ux.ibm.com,
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	Chen Yu <yu.c.chen@...el.com>
Subject: [PATCH v5 0/2] sched/numa: add statistics of numa balance task migration

Introducing the task migration and swap statistics in the following places:
/sys/fs/cgroup/{GROUP}/memory.stat
/proc/{PID}/sched
/proc/vmstat

These statistics facilitate a rapid evaluation of the performance and resource
utilization of the target workload.

Patch 1 is a fix from Libo to avoid task swapping for kernel threads
and user thread that does not have mm, because Numa balance only cares
about the user pages via VMA.

Patch 2 is the major change to expose the statistics of task migration and
swapping in corresponding files.

The reason to fold patch 1 and patch 2 into 1 patch set is that patch 1 is
necessary for patch 2 to avoid accessing a NULL mm_struct from a kernel
thread, which causes NULL pointer exception.

Changes since v4:
Skip the kernel thread in patch 1, by checking if the target thread
has PF_KTHREAD(Peter). Besides, remove the check for PF_IDLE, because
idle thread has PF_KTHREAD set already(Prateek).

Previous version:
v4:
https://lore.kernel.org/all/cover.1746611892.git.yu.c.chen@intel.com/
v3:
https://lore.kernel.org/lkml/20250430103623.3349842-1-yu.c.chen@intel.com/
v2:
https://lore.kernel.org/lkml/20250408101444.192519-1-yu.c.chen@intel.com/
v1:
https://lore.kernel.org/lkml/20250402010611.3204674-1-yu.c.chen@intel.com/

Chen Yu (1):
  sched/numa: add statistics of numa balance task

Libo Chen (1):
  sched/numa: fix task swap by skipping kernel threads

 Documentation/admin-guide/cgroup-v2.rst | 6 ++++++
 include/linux/sched.h                   | 4 ++++
 include/linux/vm_event_item.h           | 2 ++
 kernel/sched/core.c                     | 9 +++++++--
 kernel/sched/debug.c                    | 4 ++++
 kernel/sched/fair.c                     | 3 ++-
 mm/memcontrol.c                         | 2 ++
 mm/vmstat.c                             | 2 ++
 8 files changed, 29 insertions(+), 3 deletions(-)

-- 
2.25.1