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

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Date:   Tue, 18 Sep 2018 08:53:35 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Daniel Drake <drake@...lessm.com>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        Christopher Lameter <cl@...ux.com>,
        Peter Enderborg <peter.enderborg@...y.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Mike Galbraith <efault@....de>, linux-mm <linux-mm@...ck.org>,
        cgroups@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        kernel-team@...com
Subject: Re: [PATCH 0/9] psi: pressure stall information for CPU, memory, and
 IO v4

Hi Daniel,

On Sun, Sep 16, 2018 at 10:22 PM, Daniel Drake <drake@...lessm.com> wrote:
> Hi Suren
>
> On Fri, Sep 7, 2018 at 11:58 PM, Suren Baghdasaryan <surenb@...gle.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.