From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <owner-linux-mm@kvack.org>
Received: from mail-it0-f70.google.com (mail-it0-f70.google.com [209.85.214.70])
	by kanga.kvack.org (Postfix) with ESMTP id B54476B7D41
	for <linux-mm@kvack.org>; Fri,  7 Sep 2018 03:46:57 -0400 (EDT)
Received: by mail-it0-f70.google.com with SMTP id r19-v6so19427687itc.4
        for <linux-mm@kvack.org>; Fri, 07 Sep 2018 00:46:57 -0700 (PDT)
Received: from merlin.infradead.org (merlin.infradead.org. [2001:8b0:10b:1231::1])
        by mx.google.com with ESMTPS id c3-v6si5166887ith.45.2018.09.07.00.46.56
        for <linux-mm@kvack.org>
        (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256);
        Fri, 07 Sep 2018 00:46:56 -0700 (PDT)
Date: Fri, 7 Sep 2018 09:46:42 +0200
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 0/9] psi: pressure stall information for CPU, memory, and
 IO v4
Message-ID: <20180907074642.GN24106@hirez.programming.kicks-ass.net>
References: <20180828172258.3185-1-hannes@cmpxchg.org>
 <20180905214303.GA30178@cmpxchg.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20180905214303.GA30178@cmpxchg.org>
Sender: owner-linux-mm@kvack.org
List-ID: <linux-mm.kvack.org>
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?

I'll go have a look.