linux-kernel - Re: [PATCH 0/10] psi: pressure stall information for CPU, memory, and IO v2

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Message-Id: <20180712164422.a53cc0f9c26b078dbc7e5731@linux-foundation.org>
Date:   Thu, 12 Jul 2018 16:44:22 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        Christopher Lameter <cl@...ux.com>,
        Mike Galbraith <efault@....de>,
        Shakeel Butt <shakeelb@...gle.com>, linux-mm@...ck.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH 0/10] psi: pressure stall information for CPU, memory,
 and IO v2

On Thu, 12 Jul 2018 13:29:32 -0400 Johannes Weiner <hannes@...xchg.org> wrote:

>
> ...
>
> The io file is similar to memory. Because the block layer doesn't have
> a concept of hardware contention right now (how much longer is my IO
> request taking due to other tasks?), it reports CPU potential lost on
> all IO delays, not just the potential lost due to competition.

Probably dumb question: disks aren't the only form of IO.  Does it make
sense to accumulate PSI for other forms of IO?  Networking comes to
mind...