linux-kernel - Re: [PATCH 0/9] psi: pressure stall information for CPU, memory, and IO v4

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Date:   Tue, 23 Oct 2018 19:41:15 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Daniel Drake <drake@...lessm.com>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        Christopher Lameter <cl@...ux.com>,
        Peter Enderborg <peter.enderborg@...y.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Mike Galbraith <efault@....de>, linux-mm@...ck.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH 0/9] psi: pressure stall information for CPU, memory, and
 IO v4

On Tue, Oct 23, 2018 at 01:29:37PM -0400, Johannes Weiner wrote:
> On Thu, Oct 18, 2018 at 07:07:10PM -0700, Andrew Morton wrote:
> > On Tue, 28 Aug 2018 13:22:49 -0400 Johannes Weiner <hannes@...xchg.org> wrote:
> > 
> > > This version 4 of the PSI series incorporates feedback from Peter and
> > > fixes two races in the lockless aggregator that Suren found in his
> > > testing and which caused the sample calculation to sometimes underflow
> > > and record bogusly large samples; details at the bottom of this email.
> > 
> > We've had very little in the way of review activity for the PSI
> > patchset.  According to the changelog tags, anyway.
> 
> Peter reviewed it quite extensively over all revisions, and acked the
> final version. Peter, can we add your acked-by or reviewed-by tag(s)?

I don't really do reviewed by; but yes, I thought I already did; lemme
find.

> The scheduler part accounts for 99% of the complexity in those
> patches. The mm bits, while somewhat sprawling, are mostly mechanical.

Ah, I now see my mistake;

  https://lkml.kernel.org/r/20180907110407.GQ24106@hirez.programming.kicks-ass.net

I forgot to include an actual tag therein. My bad.

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>