linux-kernel - [PATCH 5/6] psi: rename psi fields in preparation for psi trigger addition

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Message-Id: <20181214171508.7791-6-surenb@google.com>
Date:   Fri, 14 Dec 2018 09:15:07 -0800
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     gregkh@...uxfoundation.org
Cc:     tj@...nel.org, lizefan@...wei.com, hannes@...xchg.org,
        axboe@...nel.dk, dennis@...nel.org, dennisszhou@...il.com,
        mingo@...hat.com, peterz@...radead.org, akpm@...ux-foundation.org,
        corbet@....net, cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com, Suren Baghdasaryan <surenb@...gle.com>
Subject: [PATCH 5/6] psi: rename psi fields in preparation for psi trigger addition

Renaming psi_group structure member fields used for calculating psi
totals and averages for clear distinction between them and trigger-related
fields that will be added next.

Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
---
 include/linux/psi_types.h | 15 ++++++++-------
 kernel/sched/psi.c        | 26 ++++++++++++++------------
 2 files changed, 22 insertions(+), 19 deletions(-)

diff --git a/include/linux/psi_types.h b/include/linux/psi_types.h
index 2c6e9b67b7eb..11b32b3395a2 100644
--- a/include/linux/psi_types.h
+++ b/include/linux/psi_types.h
@@ -69,20 +69,21 @@ struct psi_group_cpu {
 };
 
 struct psi_group {
-	/* Protects data updated during an aggregation */
-	struct mutex stat_lock;
+	/* Protects data used by the aggregator */
+	struct mutex update_lock;
 
 	/* Per-cpu task state & time tracking */
 	struct psi_group_cpu __percpu *pcpu;
 
-	/* Periodic aggregation state */
-	u64 total_prev[NR_PSI_STATES - 1];
-	u64 last_update;
-	u64 next_update;
 	struct delayed_work clock_work;
 
-	/* Total stall times and sampled pressure averages */
+	/* Total stall times observed */
 	u64 total[NR_PSI_STATES - 1];
+
+	/* Running pressure averages */
+	u64 avg_total[NR_PSI_STATES - 1];
+	u64 avg_last_update;
+	u64 avg_next_update;
 	unsigned long avg[NR_PSI_STATES - 1][3];
 };
 
diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
index 153c0624976b..694edefdd333 100644
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@@ -172,9 +172,9 @@ 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;
+	group->avg_next_update = sched_clock() + psi_period;
 	INIT_DELAYED_WORK(&group->clock_work, psi_update_work);
-	mutex_init(&group->stat_lock);
+	mutex_init(&group->update_lock);
 }
 
 void __init psi_init(void)
@@ -268,7 +268,7 @@ static void update_stats(struct psi_group *group)
 	int cpu;
 	int s;
 
-	mutex_lock(&group->stat_lock);
+	mutex_lock(&group->update_lock);
 
 	/*
 	 * Collect the per-cpu time buckets and average them into a
@@ -309,7 +309,7 @@ static void update_stats(struct psi_group *group)
 
 	/* avgX= */
 	now = sched_clock();
-	expires = group->next_update;
+	expires = group->avg_next_update;
 	if (now < expires)
 		goto out;
 
@@ -320,14 +320,14 @@ static void update_stats(struct psi_group *group)
 	 * But the deltas we sample out of the per-cpu buckets above
 	 * are based on the actual time elapsing between clock ticks.
 	 */
-	group->next_update = expires + psi_period;
-	period = now - group->last_update;
-	group->last_update = now;
+	group->avg_next_update = expires + psi_period;
+	period = now - group->avg_last_update;
+	group->avg_last_update = now;
 
 	for (s = 0; s < NR_PSI_STATES - 1; s++) {
 		u32 sample;
 
-		sample = group->total[s] - group->total_prev[s];
+		sample = group->total[s] - group->avg_total[s];
 		/*
 		 * Due to the lockless sampling of the time buckets,
 		 * recorded time deltas can slip into the next period,
@@ -347,11 +347,11 @@ static void update_stats(struct psi_group *group)
 		 */
 		if (sample > period)
 			sample = period;
-		group->total_prev[s] += sample;
+		group->avg_total[s] += sample;
 		calc_avgs(group->avg[s], sample, period);
 	}
 out:
-	mutex_unlock(&group->stat_lock);
+	mutex_unlock(&group->update_lock);
 }
 
 static void psi_update_work(struct work_struct *work)
@@ -375,8 +375,10 @@ static void psi_update_work(struct work_struct *work)
 	update_stats(group);
 
 	now = sched_clock();
-	if (group->next_update > now)
-		delay = nsecs_to_jiffies(group->next_update - now) + 1;
+	if (group->avg_next_update > now) {
+		delay = nsecs_to_jiffies(
+				group->avg_next_update - now) + 1;
+	}
 	schedule_delayed_work(dwork, delay);
 }
 
-- 
2.20.0.405.gbc1bbc6f85-goog