linux-kernel - Re: [PATCH v5 0/2] sched/numa: Skip VMA scanning on memory pinned to one NUMA node via cpuset.mems

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Message-ID: <f67fd213-b39b-4f49-a839-38b9ad5565d2@linux.ibm.com>
Date: Thu, 24 Apr 2025 15:20:07 +0530
From: Venkat Rao Bagalkote <venkat88@...ux.ibm.com>
To: Libo Chen <libo.chen@...cle.com>, akpm@...ux-foundation.org,
        rostedt@...dmis.org, peterz@...radead.org, mgorman@...e.de,
        mingo@...hat.com, juri.lelli@...hat.com, vincent.guittot@...aro.org,
        tj@...nel.org, llong@...hat.com
Cc: sraithal@....com, kprateek.nayak@....com, raghavendra.kt@....com,
        yu.c.chen@...el.com, tim.c.chen@...el.com, vineethr@...ux.ibm.com,
        chris.hyser@...cle.com, daniel.m.jordan@...cle.com,
        lorenzo.stoakes@...cle.com, mkoutny@...e.com, linux-mm@...ck.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/2] sched/numa: Skip VMA scanning on memory pinned to
 one NUMA node via cpuset.mems


On 24/04/25 8:15 am, Libo Chen wrote:
> v1->v2:
> 1. add perf improvment numbers in commit log. Yet to find perf diff on
> will-it-scale, so not included here. Plan to run more workloads.
> 2. add tracepoint.
> 3. To peterz's comment, this will make it impossible to attract tasks to
> those memory just like other VMA skippings. This is the current
> implementation, I think we can improve that in the future, but at the
> moment it's probabaly better to keep it consistent.
>
> v2->v3:
> 1. add enable_cpuset() based on Mel's suggestion but again I think it's
> redundant.
> 2. print out nodemask with %*p.. format in the tracepoint.
>
> v3->v4:
> 1. fix an unsafe dereference of a pointer to content not on ring buffer,
> namely mem_allowed_ptr in the tracepoint.
>
> v4->v5:
> 1. add BUILD_BUG_ON() in TP_fast_assign() to guard against future
> changes (particularly in size) in nodemask_t.
>
> Libo Chen (2):
>    sched/numa: Skip VMA scanning on memory pinned to one NUMA node via
>      cpuset.mems
>    sched/numa: Add tracepoint that tracks the skipping of numa balancing
>      due to cpuset memory pinning
>
>   include/trace/events/sched.h | 33 +++++++++++++++++++++++++++++++++
>   kernel/sched/fair.c          |  9 +++++++++
>   2 files changed, 42 insertions(+)
>
Tested the above patch on top of next-20250424 and it fixes the boot 
warning on IBM Power server. Hence,


Tested-by: Venkat Rao Bagalkote <venkat88@...ux.ibm.com>


Regards,

Venkat.