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

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Message-ID: <20180905214303.GA30178@cmpxchg.org>
Date:   Wed, 5 Sep 2018 17:43:03 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     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, Aug 28, 2018 at 01:22:49PM -0400, Johannes Weiner 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.

Peter, do the changes from v3 look sane to you?

If there aren't any further objections, I was hoping we could get this
lined up for 4.20.