Re: [PATCH 0/9] psi: pressure stall information for CPU, memory, and IO v4

From: Suren Baghdasaryan <surenb@google.com>
To: Daniel Drake <drake@endlessm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Tejun Heo <tj@kernel.org>,
	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 <linux-mm@kvack.org>,
	cgroups@vger.kernel.org, LKML <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: Tue, 18 Sep 2018 08:53:35 -0700	[thread overview]
Message-ID: <CAJuCfpEmFC94HYkfDSruhrBzvnEWqFO87RXkb7MDb6yV40wPPg@mail.gmail.com> (raw)
In-Reply-To: <CAD8Lp47F5N8xN41KFHybVVTpV_TEewERD-eJov6iiqBJUyVR9g@mail.gmail.com>

Hi Daniel,

On Sun, Sep 16, 2018 at 10:22 PM, Daniel Drake <drake@endlessm.com> wrote:
> Hi Suren
>
> On Fri, Sep 7, 2018 at 11:58 PM, Suren Baghdasaryan <surenb@google.com> wrote:
>> Thanks for the new patchset! Backported to 4.9 and retested on ARMv8 8
>> code system running Android. Signals behave as expected reacting to
>> memory pressure, no jumps in "total" counters that would indicate an
>> overflow/underflow issues. Nicely done!
>
> Can you share your Linux v4.9 psi backport somewhere?
>

Absolutely. Let me figure out what's the best way to do share that and
make sure they apply cleanly on official 4.9 (I was using vendor's
tree for testing). Will need a day or so to get this done.
In case you need them sooner, there were several "prerequisite"
patches that I had to backport to make PSI backporting
easier/possible. Following is the list as shown by "git log
--oneline":

PSI patches:

ef94c067f360 psi: cgroup support
60081a7aeb0b psi: pressure stall information for CPU, memory, and IO
acd2a16497e9 sched: introduce this_rq_lock_irq()
f30268c29309 sched: sched.h: make rq locking and clock functions
available in stats.h
a2fd1c94b743 sched: loadavg: make calc_load_n() public
32a74dec4967 sched: loadavg: consolidate LOAD_INT, LOAD_FRAC, CALC_LOAD
8e3991dd1a73 delayacct: track delays from thrashing cache pages
4ae940e7e6ff mm: workingset: tell cache transitions from workingset thrashing
e9ccd63399e0 mm: workingset: don't drop refault information prematurely

Prerequisites:

b5a58c778c54 workqueue: make workqueue available early during boot
ae5f39ee13b5 sched/core: Add wrappers for lockdep_(un)pin_lock()
7276f98a72c1 sched/headers, delayacct: Move the 'struct
task_delay_info' definition from <linux/sched.h> to
<linux/delayacct.h>
287318d13688 mm: add PageWaiters indicating tasks are waiting for a page bit
edfa64560aaa sched/headers: Remove <linux/sched.h> from <linux/sched/loadavg.h>
f6b6ba853959 sched/headers: Move loadavg related definitions from
<linux/sched.h> to <linux/sched/loadavg.h>
395b0a9f7aae sched/headers: Prepare for new header dependencies before
moving code to <linux/sched/loadavg.h>

PSI patches needed some adjustments but nothing really major.

> Thanks
> Daniel

Thanks,
Suren.