linux-kernel - [PATCH v4 0/2] sched/numa: add statistics of numa balance task migration

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Message-Id: <cover.1746611892.git.yu.c.chen@intel.com>
Date: Wed,  7 May 2025 19:14:53 +0800
From: Chen Yu <yu.c.chen@...el.com>
To: Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: mkoutny@...e.com,
	Ingo Molnar <mingo@...hat.com>,
	Tejun Heo <tj@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Jonathan Corbet <corbet@....net>,
	Mel Gorman <mgorman@...e.de>,
	Michal Hocko <mhocko@...nel.org>,
	Muchun Song <muchun.song@...ux.dev>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	"Chen, Tim C" <tim.c.chen@...el.com>,
	Aubrey Li <aubrey.li@...el.com>,
	Libo Chen <libo.chen@...cle.com>,
	K Prateek Nayak <kprateek.nayak@....com>,
	Madadi Vineeth Reddy <vineethr@...ux.ibm.com>,
	Venkat Rao Bagalkote <venkat88@...ux.ibm.com>,
	"Jain, Ayush" <ayushjai@....com>,
	cgroups@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Chen Yu <yu.chen.surf@...mail.com>,
	Chen Yu <yu.c.chen@...el.com>
Subject: [PATCH v4 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,
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.

The Tested-by and Acked-by tags are preserved, because these tags are provided
in version 1 which has the p->mm check.

Previous version:
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 migration

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