From: Quentin Perret <quentin.perret@arm.com>
To: peterz@infradead.org, rjw@rjwysocki.net,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org
Cc: gregkh@linuxfoundation.org, mingo@redhat.com,
dietmar.eggemann@arm.com, morten.rasmussen@arm.com,
chris.redpath@arm.com, patrick.bellasi@arm.com,
valentin.schneider@arm.com, vincent.guittot@linaro.org,
thara.gopinath@linaro.org, viresh.kumar@linaro.org,
tkjos@google.com, joel@joelfernandes.org, smuckle@google.com,
adharmap@codeaurora.org, skannan@codeaurora.org,
pkondeti@codeaurora.org, juri.lelli@redhat.com,
edubezval@gmail.com, srinivas.pandruvada@linux.intel.com,
currojerez@riseup.net, javi.merino@kernel.org,
quentin.perret@arm.com
Subject: [PATCH v8 11/15] sched/fair: Clean-up update_sg_lb_stats parameters
Date: Tue, 16 Oct 2018 11:15:09 +0100 [thread overview]
Message-ID: <20181016101513.26919-12-quentin.perret@arm.com> (raw)
In-Reply-To: <20181016101513.26919-1-quentin.perret@arm.com>
In preparation for the introduction of a new root domain flag which can
be set during load balance (the 'overutilized' flag), clean-up the set
of parameters passed to update_sg_lb_stats(). More specifically, the
'local_group' and 'local_idx' parameters can be removed since they can
easily be reconstructed from within the function.
While at it, transform the 'overload' parameter into a flag stored in
the 'sg_status' parameter hence facilitating the definition of new flags
when needed.
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Suggested-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Quentin Perret <quentin.perret@arm.com>
---
kernel/sched/fair.c | 27 +++++++++++----------------
kernel/sched/sched.h | 3 +++
2 files changed, 14 insertions(+), 16 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e60858745071..13dc5da422a1 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7836,16 +7836,16 @@ static bool update_nohz_stats(struct rq *rq, bool force)
* update_sg_lb_stats - Update sched_group's statistics for load balancing.
* @env: The load balancing environment.
* @group: sched_group whose statistics are to be updated.
- * @load_idx: Load index of sched_domain of this_cpu for load calc.
- * @local_group: Does group contain this_cpu.
* @sgs: variable to hold the statistics for this group.
- * @overload: Indicate pullable load (e.g. >1 runnable task).
+ * @sg_status: Holds flag indicating the status of the sched_group
*/
static inline void update_sg_lb_stats(struct lb_env *env,
- struct sched_group *group, int load_idx,
- int local_group, struct sg_lb_stats *sgs,
- bool *overload)
+ struct sched_group *group,
+ struct sg_lb_stats *sgs,
+ int *sg_status)
{
+ int local_group = cpumask_test_cpu(env->dst_cpu, sched_group_span(group));
+ int load_idx = get_sd_load_idx(env->sd, env->idle);
unsigned long load;
int i, nr_running;
@@ -7869,7 +7869,7 @@ static inline void update_sg_lb_stats(struct lb_env *env,
nr_running = rq->nr_running;
if (nr_running > 1)
- *overload = true;
+ *sg_status |= SG_OVERLOAD;
#ifdef CONFIG_NUMA_BALANCING
sgs->nr_numa_running += rq->nr_numa_running;
@@ -7885,7 +7885,7 @@ static inline void update_sg_lb_stats(struct lb_env *env,
if (env->sd->flags & SD_ASYM_CPUCAPACITY &&
sgs->group_misfit_task_load < rq->misfit_task_load) {
sgs->group_misfit_task_load = rq->misfit_task_load;
- *overload = 1;
+ *sg_status |= SG_OVERLOAD;
}
}
@@ -8030,17 +8030,14 @@ static inline void update_sd_lb_stats(struct lb_env *env, struct sd_lb_stats *sd
struct sched_group *sg = env->sd->groups;
struct sg_lb_stats *local = &sds->local_stat;
struct sg_lb_stats tmp_sgs;
- int load_idx;
- bool overload = false;
bool prefer_sibling = child && child->flags & SD_PREFER_SIBLING;
+ int sg_status = 0;
#ifdef CONFIG_NO_HZ_COMMON
if (env->idle == CPU_NEWLY_IDLE && READ_ONCE(nohz.has_blocked))
env->flags |= LBF_NOHZ_STATS;
#endif
- load_idx = get_sd_load_idx(env->sd, env->idle);
-
do {
struct sg_lb_stats *sgs = &tmp_sgs;
int local_group;
@@ -8055,8 +8052,7 @@ static inline void update_sd_lb_stats(struct lb_env *env, struct sd_lb_stats *sd
update_group_capacity(env->sd, env->dst_cpu);
}
- update_sg_lb_stats(env, sg, load_idx, local_group, sgs,
- &overload);
+ update_sg_lb_stats(env, sg, sgs, &sg_status);
if (local_group)
goto next_group;
@@ -8106,8 +8102,7 @@ static inline void update_sd_lb_stats(struct lb_env *env, struct sd_lb_stats *sd
if (!env->sd->parent) {
/* update overload indicator if we are at root domain */
- if (READ_ONCE(env->dst_rq->rd->overload) != overload)
- WRITE_ONCE(env->dst_rq->rd->overload, overload);
+ WRITE_ONCE(env->dst_rq->rd->overload, sg_status & SG_OVERLOAD);
}
}
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 9d6cf58a8aff..69f31bc0d320 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -707,6 +707,9 @@ struct perf_domain {
struct rcu_head rcu;
};
+/* Scheduling group status flags */
+#define SG_OVERLOAD 0x1 /* More than one runnable task on a CPU. */
+
/*
* We add the notion of a root-domain which will be used to define per-domain
* variables. Each exclusive cpuset essentially defines an island domain by
--
2.19.1
next prev parent reply other threads:[~2018-10-16 10:16 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-16 10:14 [PATCH v8 00/15] Energy Aware Scheduling Quentin Perret
2018-10-16 10:14 ` [PATCH v8 01/15] sched: Relocate arch_scale_cpu_capacity Quentin Perret
2018-10-16 10:15 ` [PATCH v8 02/15] sched/cpufreq: Prepare schedutil for Energy Aware Scheduling Quentin Perret
2018-10-16 10:15 ` [PATCH v8 03/15] PM: Introduce an Energy Model management framework Quentin Perret
2018-11-07 16:32 ` Vincent Guittot
2018-11-07 17:02 ` Quentin Perret
2018-11-07 18:02 ` Vincent Guittot
2018-10-16 10:15 ` [PATCH v8 04/15] PM / EM: Expose the Energy Model in sysfs Quentin Perret
2018-10-16 10:15 ` [PATCH v8 05/15] sched/topology: Reference the Energy Model of CPUs when available Quentin Perret
2018-10-16 10:15 ` [PATCH v8 06/15] sched/topology: Lowest CPU asymmetry sched_domain level pointer Quentin Perret
2018-10-16 10:15 ` [PATCH v8 07/15] sched/topology: Disable EAS on inappropriate platforms Quentin Perret
2018-10-16 10:15 ` [PATCH v8 08/15] sched/topology: Make Energy Aware Scheduling depend on schedutil Quentin Perret
2018-10-16 10:15 ` [PATCH v8 09/15] sched: Introduce sched_energy_present static key Quentin Perret
2018-10-16 10:15 ` [PATCH v8 10/15] sched: Introduce a sysctl for Energy Aware Scheduling Quentin Perret
2018-10-16 12:50 ` Juri Lelli
2018-10-16 13:36 ` Quentin Perret
2018-10-16 13:46 ` Juri Lelli
2018-10-16 10:15 ` Quentin Perret [this message]
2018-10-16 10:15 ` [PATCH v8 12/15] sched: Add over-utilization/tipping point indicator Quentin Perret
2018-10-16 10:15 ` [PATCH v8 13/15] sched/fair: Introduce an energy estimation helper function Quentin Perret
2018-10-16 10:15 ` [PATCH v8 14/15] sched/fair: Select an energy-efficient CPU on task wake-up Quentin Perret
2018-10-16 10:15 ` [PATCH v8 15/15] OPTIONAL: cpufreq: dt: Register an Energy Model Quentin Perret
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