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author | Peter Zijlstra <peterz@infradead.org> | 2020-11-17 18:19:36 -0500 |
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committer | Peter Zijlstra <peterz@infradead.org> | 2021-05-12 11:43:28 +0200 |
commit | 8a311c740b53324ec584e0e3bb7077d56b123c28 (patch) | |
tree | b39bff43b1eb21f18c94272c2ad9118ca9727021 /kernel/sched/sched.h | |
parent | 21f56ffe4482e501b9e83737612493eeaac21f5a (diff) | |
download | linux-8a311c740b53324ec584e0e3bb7077d56b123c28.tar.bz2 |
sched: Basic tracking of matching tasks
Introduce task_struct::core_cookie as an opaque identifier for core
scheduling. When enabled; core scheduling will only allow matching
task to be on the core; where idle matches everything.
When task_struct::core_cookie is set (and core scheduling is enabled)
these tasks are indexed in a second RB-tree, first on cookie value
then on scheduling function, such that matching task selection always
finds the most elegible match.
NOTE: *shudder* at the overhead...
NOTE: *sigh*, a 3rd copy of the scheduling function; the alternative
is per class tracking of cookies and that just duplicates a lot of
stuff for no raisin (the 2nd copy lives in the rt-mutex PI code).
[Joel: folded fixes]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Don Hiatt <dhiatt@digitalocean.com>
Tested-by: Hongyu Ning <hongyu.ning@linux.intel.com>
Tested-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lkml.kernel.org/r/20210422123308.496975854@infradead.org
Diffstat (limited to 'kernel/sched/sched.h')
-rw-r--r-- | kernel/sched/sched.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index fa990cd259ce..e43a2176d88f 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1080,6 +1080,10 @@ struct rq { /* per rq */ struct rq *core; unsigned int core_enabled; + struct rb_root core_tree; + + /* shared state */ + unsigned int core_task_seq; #endif }; @@ -1243,6 +1247,57 @@ DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues); #define cpu_curr(cpu) (cpu_rq(cpu)->curr) #define raw_rq() raw_cpu_ptr(&runqueues) +#ifdef CONFIG_FAIR_GROUP_SCHED +static inline struct task_struct *task_of(struct sched_entity *se) +{ + SCHED_WARN_ON(!entity_is_task(se)); + return container_of(se, struct task_struct, se); +} + +static inline struct cfs_rq *task_cfs_rq(struct task_struct *p) +{ + return p->se.cfs_rq; +} + +/* runqueue on which this entity is (to be) queued */ +static inline struct cfs_rq *cfs_rq_of(struct sched_entity *se) +{ + return se->cfs_rq; +} + +/* runqueue "owned" by this group */ +static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp) +{ + return grp->my_q; +} + +#else + +static inline struct task_struct *task_of(struct sched_entity *se) +{ + return container_of(se, struct task_struct, se); +} + +static inline struct cfs_rq *task_cfs_rq(struct task_struct *p) +{ + return &task_rq(p)->cfs; +} + +static inline struct cfs_rq *cfs_rq_of(struct sched_entity *se) +{ + struct task_struct *p = task_of(se); + struct rq *rq = task_rq(p); + + return &rq->cfs; +} + +/* runqueue "owned" by this group */ +static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp) +{ + return NULL; +} +#endif + extern void update_rq_clock(struct rq *rq); static inline u64 __rq_clock_broken(struct rq *rq) |