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From: Daniel Drake <drake@endlessm.com>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Tejun Heo <tj@kernel.org>, Suren Baghdasaryan <surenb@google.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 <linux-kernel@vger.kernel.org>,
	kernel-team@fb.com
Subject: Re: [PATCH 0/9] psi: pressure stall information for CPU, memory, and IO v4
Date: Fri, 7 Sep 2018 15:36:56 +0800
Message-ID: <CAD8Lp44vHpMiWZdU9+mp-pe2kXmnxF1zm20SNWf2BVunk8c46g@mail.gmail.com> (raw)
In-Reply-To: <20180905214303.GA30178@cmpxchg.org>

On Thu, Sep 6, 2018 at 5:43 AM, Johannes Weiner <hannes@cmpxchg.org> wrote:
> 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.

That would be excellent. I just retested the latest version at
http://git.cmpxchg.org/cgit.cgi/linux-psi.git (Linux 4.18) and the
results are great.

Test setup:
Endless OS
GeminiLake N4200 low end laptop
2GB RAM
swap (and zram swap) disabled

Baseline test: open a handful of large-ish apps and several website
tabs in Google Chrome.
Results: after a couple of minutes, system is excessively thrashing,
mouse cursor can barely be moved, UI is not responding to mouse
clicks, so it's impractical to recover from this situation as an
ordinary user

Add my simple killer:
https://gist.github.com/dsd/a8988bf0b81a6163475988120fe8d9cd
Results: when the thrashing causes the UI to become sluggish, the
killer steps in and kills something (usually a chrome tab), and the
system remains usable. I repeatedly opened more apps and more websites
over a 15 minute period but I wasn't able to get the system to a point
of UI unresponsiveness.

Thanks,
Daniel

  reply index

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-28 17:22 Johannes Weiner
2018-08-28 17:22 ` [PATCH 1/9] mm: workingset: don't drop refault information prematurely Johannes Weiner
2018-08-28 17:22 ` [PATCH 2/9] mm: workingset: tell cache transitions from workingset thrashing Johannes Weiner
2018-08-28 17:22 ` [PATCH 3/9] delayacct: track delays from thrashing cache pages Johannes Weiner
2018-08-28 17:22 ` [PATCH 4/9] sched: loadavg: consolidate LOAD_INT, LOAD_FRAC, CALC_LOAD Johannes Weiner
2018-09-12 23:28   ` Andrew Morton
2018-09-13  1:49     ` Johannes Weiner
2018-08-28 17:22 ` [PATCH 5/9] sched: loadavg: make calc_load_n() public Johannes Weiner
2018-08-28 17:22 ` [PATCH 6/9] sched: sched.h: make rq locking and clock functions available in stats.h Johannes Weiner
2018-08-28 17:22 ` [PATCH 7/9] sched: introduce this_rq_lock_irq() Johannes Weiner
2018-08-28 17:22 ` [PATCH 8/9] psi: pressure stall information for CPU, memory, and IO Johannes Weiner
2018-08-28 20:11   ` Randy Dunlap
2018-08-28 20:56     ` Johannes Weiner
2018-08-28 21:30       ` Randy Dunlap
2018-09-07 10:16   ` Peter Zijlstra
2018-09-07 10:21     ` Peter Zijlstra
2018-09-07 14:44     ` Johannes Weiner
2018-09-07 14:58       ` Peter Zijlstra
2018-09-07 17:50         ` Johannes Weiner
2018-09-07 10:24   ` Peter Zijlstra
2018-09-07 14:54     ` Johannes Weiner
2018-08-28 17:22 ` [PATCH 9/9] psi: cgroup support Johannes Weiner
2018-09-05 21:43 ` [PATCH 0/9] psi: pressure stall information for CPU, memory, and IO v4 Johannes Weiner
2018-09-07  7:36   ` Daniel Drake [this message]
2018-09-07  7:46   ` Peter Zijlstra
2018-09-07 11:04   ` Peter Zijlstra
2018-09-07 15:09     ` Johannes Weiner
2018-09-07 15:58       ` Suren Baghdasaryan
2018-09-17  5:22         ` Daniel Drake
2018-09-18 15:53           ` Suren Baghdasaryan
2018-09-25 22:05             ` Suren Baghdasaryan
2018-09-17 13:29         ` peter enderborg
2018-09-17 13:40           ` Peter Zijlstra
2018-09-18 16:03           ` Suren Baghdasaryan
2018-10-19  2:07 ` Andrew Morton
2018-10-23 17:29   ` Johannes Weiner
2018-10-23 17:41     ` Peter Zijlstra

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