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authorPeter Zijlstra <peterz@infradead.org>2016-05-09 11:37:59 +0300
committerIngo Molnar <mingo@kernel.org>2016-09-30 11:54:06 +0300
commit24fc7edb92eea05946119cc0258c891c26b3b469 (patch)
treef746d2b660304243515e81f978145fca61783f63 /include/linux/sched.h
parent16f3ef46805a5ffc75549deac2ff6af08bdf590b (diff)
downloadlinux-24fc7edb92eea05946119cc0258c891c26b3b469.tar.xz
sched/core: Introduce 'struct sched_domain_shared'
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>
Diffstat (limited to 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index b99fcd1b341e..8a878b9649a1 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -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;
};