linux-kernel - Re: [PATCH 0/9] psi: pressure stall information for CPU, memory, and IO v3

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Message-ID: <5576a988-fca9-15a5-5fa8-16f704ea20fb@sony.com>
Date:   Tue, 7 Aug 2018 13:50:09 +0200
From:   peter enderborg <peter.enderborg@...y.com>
To:     Johannes Weiner <hannes@...xchg.org>,
        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>,
        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 0/9] psi: pressure stall information for CPU, memory, and
 IO v3

On 08/01/2018 05:19 PM, Johannes Weiner wrote:
>
> A kernel with CONFIG_PSI=y will create a /proc/pressure directory with
> 3 files: cpu, memory, and io. If using cgroup2, cgroups will also have
> cpu.pressure, memory.pressure and io.pressure files, which simply
> aggregate task stalls at the cgroup level instead of system-wide.
>
Usually there are objections to add more stuff to /proc. Is this an exception?