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Date:   Tue, 23 Oct 2018 13:29:37 -0400
From:   Johannes Weiner <hannes@cmpxchg.org>
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     Ingo Molnar <mingo@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Tejun Heo <tj@kernel.org>,
        Suren Baghdasaryan <surenb@google.com>,
        Daniel Drake <drake@endlessm.com>,
        Vinayak Menon <vinmenon@codeaurora.org>,
        Christopher Lameter <cl@linux.com>,
        Peter Enderborg <peter.enderborg@sony.com>,
        Shakeel Butt <shakeelb@google.com>,
        Mike Galbraith <efault@gmx.de>, linux-mm@kvack.org,
        cgroups@vger.kernel.org, linux-kernel@vger.kernel.org,
        kernel-team@fb.com
Subject: Re: [PATCH 0/9] psi: pressure stall information for CPU, memory, and
 IO v4
Message-ID: <20181023172937.GA21443@cmpxchg.org>
References: <20180828172258.3185-1-hannes@cmpxchg.org>
 <20181018190710.fcea1c5f9c3b0c15d37ee762@linux-foundation.org>
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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@cmpxchg.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)?

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