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Date: Fri, 7 Sep 2018 13:04:07 +0200
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 0/9] psi: pressure stall information for CPU, memory, and
 IO v4
Message-ID: <20180907110407.GQ24106@hirez.programming.kicks-ass.net>
References: <20180828172258.3185-1-hannes@cmpxchg.org>
 <20180905214303.GA30178@cmpxchg.org>
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To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Ingo Molnar <mingo@redhat.com>, Andrew Morton <akpm@linux-foundation.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

On Wed, Sep 05, 2018 at 05:43:03PM -0400, Johannes Weiner wrote:
> 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.

I suppose it looks ok, there's a few small nits, but nothing big.

I still hate psi_ttwu_dequeue(), but I don't really know what to about
that.

So yeah, grudingly acked. Did you want me to pick this up through the
scheduler tree since most of this lives there?