Re: [RFC PATCH v3] tick/sched: Ensure quiet_vmstat() is called when the idle tick was stopped too

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To: Christoph Lameter <cl@xxxxxxxxx>
Subject: Re: [RFC PATCH v3] tick/sched: Ensure quiet_vmstat() is called when the idle tick was stopped too
From: Aaron Tomlin <atomlin@xxxxxxxxxx>
Date: Mon, 25 Apr 2022 15:51:09 +0100
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>, frederic@xxxxxxxxxx, mtosatti@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, pauld@xxxxxxxxxx, neelx@xxxxxxxxxx, oleksandr@xxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx
In-reply-to: <alpine.DEB.2.22.394.2204251603570.25814@gentwo.de>
References: <20220422193647.3808657-1-atomlin@redhat.com> <alpine.DEB.2.22.394.2204250919400.2367@gentwo.de> <20220425113909.u3smtztp66svlw4o@ava.usersys.com> <alpine.DEB.2.22.394.2204251406370.13839@gentwo.de> <20220425132700.GK2731@worktop.programming.kicks-ass.net> <alpine.DEB.2.22.394.2204251603570.25814@gentwo.de>

On Mon 2022-04-25 16:06 +0200, Christoph Lameter wrote:
> It may depend though on how long the idle periods are. Do we have
> statistics on the duration? Always folding the vmstat deltas may also
> increase the length of the idle periods.

Unfortunately I do not. I noticed that this situation can occur via source
code and vmcore analysis.

Kind regards,

-- 
Aaron Tomlin

References:
- [RFC PATCH v3] tick/sched: Ensure quiet_vmstat() is called when the idle tick was stopped too
  - From: Aaron Tomlin
- Re: [RFC PATCH v3] tick/sched: Ensure quiet_vmstat() is called when the idle tick was stopped too
  - From: Christoph Lameter
- Re: [RFC PATCH v3] tick/sched: Ensure quiet_vmstat() is called when the idle tick was stopped too
  - From: Aaron Tomlin
- Re: [RFC PATCH v3] tick/sched: Ensure quiet_vmstat() is called when the idle tick was stopped too
  - From: Christoph Lameter
- Re: [RFC PATCH v3] tick/sched: Ensure quiet_vmstat() is called when the idle tick was stopped too
  - From: Peter Zijlstra
- Re: [RFC PATCH v3] tick/sched: Ensure quiet_vmstat() is called when the idle tick was stopped too
  - From: Christoph Lameter

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