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| author | Thomas Gleixner <tglx@linutronix.de> | 2019-03-13 17:55:48 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-04-16 16:55:15 +0200 |
| commit | 6d25be5782e482eb93e3de0c94d0a517879377d0 (patch) | |
| tree | 4130e400ad5e37303f02e98cb2ade08c2e810c26 /kernel/workqueue_internal.h | |
| parent | e2abb398115e9c33f3d1e25bf6d1d08badc58b13 (diff) | |
| download | linux-6d25be5782e482eb93e3de0c94d0a517879377d0.tar.gz linux-6d25be5782e482eb93e3de0c94d0a517879377d0.tar.bz2 linux-6d25be5782e482eb93e3de0c94d0a517879377d0.zip | |
sched/core, workqueues: Distangle worker accounting from rq lock
The worker accounting for CPU bound workers is plugged into the core
scheduler code and the wakeup code. This is not a hard requirement and
can be avoided by keeping track of the state in the workqueue code
itself.
Keep track of the sleeping state in the worker itself and call the
notifier before entering the core scheduler. There might be false
positives when the task is woken between that call and actually
scheduling, but that's not really different from scheduling and being
woken immediately after switching away. When nr_running is updated when
the task is retunrning from schedule() then it is later compared when it
is done from ttwu().
[ bigeasy: preempt_disable() around wq_worker_sleeping() by Daniel Bristot de Oliveira ]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/ad2b29b5715f970bffc1a7026cabd6ff0b24076a.1532952814.git.bristot@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/workqueue_internal.h')
| -rw-r--r-- | kernel/workqueue_internal.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/workqueue_internal.h b/kernel/workqueue_internal.h index cb68b03ca89a..498de0e909a4 100644 --- a/kernel/workqueue_internal.h +++ b/kernel/workqueue_internal.h @@ -44,6 +44,7 @@ struct worker { unsigned long last_active; /* L: last active timestamp */ unsigned int flags; /* X: flags */ int id; /* I: worker id */ + int sleeping; /* None */ /* * Opaque string set with work_set_desc(). Printed out with task @@ -72,8 +73,8 @@ static inline struct worker *current_wq_worker(void) * Scheduler hooks for concurrency managed workqueue. Only to be used from * sched/ and workqueue.c. */ -void wq_worker_waking_up(struct task_struct *task, int cpu); -struct task_struct *wq_worker_sleeping(struct task_struct *task); +void wq_worker_running(struct task_struct *task); +void wq_worker_sleeping(struct task_struct *task); work_func_t wq_worker_last_func(struct task_struct *task); #endif /* _KERNEL_WORKQUEUE_INTERNAL_H */ |