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From: Johannes Weiner <hannes@cmpxchg.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Tejun Heo <tj@kernel.org>, Suren Baghdasaryan <surenb@google.com>,
	Daniel Drake <drake@endlessm.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@vger.kernel.org, kernel-team@fb.com
Subject: Re: [PATCH 8/9] psi: pressure stall information for CPU, memory, and IO
Date: Fri, 7 Sep 2018 10:54:04 -0400
Message-ID: <20180907145404.GB11088@cmpxchg.org> (raw)
In-Reply-To: <20180907102458.GP24106@hirez.programming.kicks-ass.net>

On Fri, Sep 07, 2018 at 12:24:58PM +0200, Peter Zijlstra wrote:
> On Tue, Aug 28, 2018 at 01:22:57PM -0400, Johannes Weiner wrote:
> > +static void psi_clock(struct work_struct *work)
> > +{
> > +	struct delayed_work *dwork;
> > +	struct psi_group *group;
> > +	bool nonidle;
> > +
> > +	dwork = to_delayed_work(work);
> > +	group = container_of(dwork, struct psi_group, clock_work);
> > +
> > +	/*
> > +	 * If there is task activity, periodically fold the per-cpu
> > +	 * times and feed samples into the running averages. If things
> > +	 * are idle and there is no data to process, stop the clock.
> > +	 * Once restarted, we'll catch up the running averages in one
> > +	 * go - see calc_avgs() and missed_periods.
> > +	 */
> > +
> > +	nonidle = update_stats(group);
> > +
> > +	if (nonidle) {
> > +		unsigned long delay = 0;
> > +		u64 now;
> > +
> > +		now = sched_clock();
> > +		if (group->next_update > now)
> > +			delay = nsecs_to_jiffies(group->next_update - now) + 1;
> > +		schedule_delayed_work(dwork, delay);
> > +	}
> > +}
> 
> Just a little nit; I would expect a function called *clock() to return a
> time.

Fair enough, let's rename this. How about this on top?

diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
index 92489e66840b..0f07749b60a4 100644
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@@ -154,7 +154,7 @@ static struct psi_group psi_system = {
 	.pcpu = &system_group_pcpu,
 };
 
-static void psi_clock(struct work_struct *work);
+static void psi_update_work(struct work_struct *work);
 
 static void group_init(struct psi_group *group)
 {
@@ -163,7 +163,7 @@ static void group_init(struct psi_group *group)
 	for_each_possible_cpu(cpu)
 		seqcount_init(&per_cpu_ptr(group->pcpu, cpu)->seq);
 	group->next_update = sched_clock() + psi_period;
-	INIT_DELAYED_WORK(&group->clock_work, psi_clock);
+	INIT_DELAYED_WORK(&group->clock_work, psi_update_work);
 	mutex_init(&group->stat_lock);
 }
 
@@ -347,7 +347,7 @@ static bool update_stats(struct psi_group *group)
 	return nonidle_total;
 }
 
-static void psi_clock(struct work_struct *work)
+static void psi_update_work(struct work_struct *work)
 {
 	struct delayed_work *dwork;
 	struct psi_group *group;

  reply index

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-28 17:22 [PATCH 0/9] psi: pressure stall information for CPU, memory, and IO v4 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 [this message]
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
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
  -- strict thread matches above, loose matches on Subject: below --
2018-08-01 15:19 [PATCH 0/9] psi: pressure stall information for CPU, memory, and IO v3 Johannes Weiner
2018-08-01 15:19 ` [PATCH 8/9] psi: pressure stall information for CPU, memory, and IO Johannes Weiner
2018-08-03 16:56   ` Peter Zijlstra
2018-08-06 15:05     ` Johannes Weiner
2018-08-06 15:25       ` Peter Zijlstra
2018-08-06 15:40         ` Johannes Weiner
2018-08-06 15:19     ` Johannes Weiner
2018-08-06 16:03       ` Peter Zijlstra
2018-08-21 19:44     ` Johannes Weiner
2018-08-22  9:16       ` Peter Zijlstra
2018-08-03 17:07   ` Peter Zijlstra
2018-08-06 15:23     ` Johannes Weiner
2018-08-03 17:15   ` Peter Zijlstra
2018-08-03 17:21   ` Peter Zijlstra
2018-08-21 20:11     ` Johannes Weiner
2018-08-22  9:10       ` Peter Zijlstra
2018-08-22 17:28         ` Johannes Weiner
2018-08-01 15:12 Johannes Weiner
2018-08-01 15:13 ` [PATCH 8/9] psi: pressure stall information for CPU, memory, and IO Johannes Weiner

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