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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@linux.vnet.ibm.com>
AuthorDate: Wed, 20 Jun 2018 22:32:49 +0530
Committer: Ingo Molnar <mingo@kernel.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@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Rik van Riel <riel@surriel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1529514181-9842-9-git-send-email-srikar@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.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 {
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