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sched/core: Introduce 'struct sched_domain_shared'

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Since struct sched_domain is strictly per cpu; introduce a structure
that is shared between all 'identical' sched_domains.

Limit to SD_SHARE_PKG_RESOURCES domains for now, as we'll only use it
for shared cache state; if another use comes up later we can easily
relax this.

While the sched_group's are normally shared between CPUs, these are
not natural to use when we need some shared state on a domain level --
since that would require the domain to have a parent, which is not a
given.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra
2016-05-09 10:37:59 +02:00
committed by Ingo Molnar
parent 16f3ef4680
commit 24fc7edb92
2 changed files with 45 additions and 5 deletions
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6
include/linux/sched.h
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@@ -1067,6 +1067,10 @@ extern int sched_domain_level_max;
struct sched_group;
struct sched_domain_shared {
atomic_t ref;
};
struct sched_domain {
/* These fields must be setup */
struct sched_domain *parent; /* top domain must be null terminated */
@@ -1135,6 +1139,7 @@ struct sched_domain {
void *private; /* used during construction */
struct rcu_head rcu; /* used during destruction */
};
struct sched_domain_shared *shared;
unsigned int span_weight;
/*
@@ -1168,6 +1173,7 @@ typedef int (*sched_domain_flags_f)(void);
struct sd_data {
struct sched_domain **__percpu sd;
struct sched_domain_shared **__percpu sds;
struct sched_group **__percpu sg;
struct sched_group_capacity **__percpu sgc;
};