linux-kernel - [tip:sched/core] sched/numa: Remove unused task_capacity from 'struct numa

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Message-ID: <tip-10864a9e222048a862da2c21efa28929a4dfed15@git.kernel.org>
Date:   Wed, 25 Jul 2018 07:27:34 -0700
From:   tip-bot for Srikar Dronamraju <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     srikar@...ux.vnet.ibm.com, peterz@...radead.org, hpa@...or.com,
        torvalds@...ux-foundation.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org, riel@...riel.com, tglx@...utronix.de,
        mgorman@...hsingularity.net
Subject: [tip:sched/core] sched/numa: Remove unused task_capacity from
 'struct numa_stats'

Commit-ID:  10864a9e222048a862da2c21efa28929a4dfed15
Gitweb:     https://git.kernel.org/tip/10864a9e222048a862da2c21efa28929a4dfed15
Author:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
AuthorDate: Wed, 20 Jun 2018 22:32:49 +0530
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 25 Jul 2018 11:41:07 +0200

sched/numa: Remove unused task_capacity from 'struct numa_stats'

The task_capacity field in 'struct numa_stats' is redundant.
Also move nr_running for better packing within the struct.

No functional changes.

Running SPECjbb2005 on a 4 node machine and comparing bops/JVM
JVMS  LAST_PATCH  WITH_PATCH  %CHANGE
16    25308.6     25377.3     0.271
1     72964       72287       -0.92

Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Mel Gorman <mgorman@...hsingularity.net>
Acked-by: Rik van Riel <riel@...riel.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1529514181-9842-9-git-send-email-srikar@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e5f39e8dfe53..4ac60b296d96 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1450,14 +1450,12 @@ static unsigned long capacity_of(int cpu);
 
 /* Cached statistics for all CPUs within a node */
 struct numa_stats {
-	unsigned long nr_running;
 	unsigned long load;
 
 	/* Total compute capacity of CPUs on a node */
 	unsigned long compute_capacity;
 
-	/* Approximate capacity in terms of runnable tasks on a node */
-	unsigned long task_capacity;
+	unsigned int nr_running;
 	int has_free_capacity;
 };
 
@@ -1495,9 +1493,9 @@ static void update_numa_stats(struct numa_stats *ns, int nid)
 	smt = DIV_ROUND_UP(SCHED_CAPACITY_SCALE * cpus, ns->compute_capacity);
 	capacity = cpus / smt; /* cores */
 
-	ns->task_capacity = min_t(unsigned, capacity,
+	capacity = min_t(unsigned, capacity,
 		DIV_ROUND_CLOSEST(ns->compute_capacity, SCHED_CAPACITY_SCALE));
-	ns->has_free_capacity = (ns->nr_running < ns->task_capacity);
+	ns->has_free_capacity = (ns->nr_running < capacity);
 }
 
 struct task_numa_env {