Re: [PATCH v13 3/6] mm/vmstat: manage per-CPU stats from CPU context when NOHZ full

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To: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Subject: Re: [PATCH v13 3/6] mm/vmstat: manage per-CPU stats from CPU context when NOHZ full
From: Hillf Danton <hdanton@xxxxxxxx>
Date: Tue, 10 Jan 2023 10:43:56 +0800
Cc: atomlin@xxxxxxxxxxx, frederic@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx
In-reply-to: <Y7wg4bC65mNcpElo@tpad>
References: <20230105125218.031928326@redhat.com> <20230106001244.4463-1-hdanton@sina.com> <20230106150154.4560-1-hdanton@sina.com> <20230107001529.4617-1-hdanton@sina.com>

On 9 Jan 2023 11:12:49 -0300 Marcelo Tosatti <mtosatti@xxxxxxxxxx>
> 
> Yes, but if you do not return to userspace, then the per-CPU vm
> statistics can be dirty indefinitely.

Could you specify the reasons for failing to return to userspace,
given it is undesired intereference for the shepherd to queue work
on the isolated CPUs.

Follow-Ups:
- Re: [PATCH v13 3/6] mm/vmstat: manage per-CPU stats from CPU context when NOHZ full
  - From: Marcelo Tosatti

References:
- [PATCH v13 0/6] Ensure quiet_vmstat() is called when returning to userpace and when idle tick is stopped
  - From: Marcelo Tosatti
- Re: [PATCH v13 3/6] mm/vmstat: manage per-CPU stats from CPU context when NOHZ full
  - From: Hillf Danton
- Re: [PATCH v13 3/6] mm/vmstat: manage per-CPU stats from CPU context when NOHZ full
  - From: Hillf Danton
- Re: [PATCH v13 3/6] mm/vmstat: manage per-CPU stats from CPU context when NOHZ full
  - From: Hillf Danton
- Re: [PATCH v13 3/6] mm/vmstat: manage per-CPU stats from CPU context when NOHZ full
  - From: Marcelo Tosatti

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