path: root/include/linux/psi_types.h
diff options
authorSuren Baghdasaryan <surenb@google.com>2020-05-28 12:54:42 -0700
committerPeter Zijlstra <peterz@infradead.org>2020-06-15 14:10:03 +0200
commit461daba06bdcb9c7a3f92b9bbd110e1f7d093ffc (patch)
tree83809825cabcd8d1ea54efb4d57e72266153fb19 /include/linux/psi_types.h
parentx86, sched: Bail out of frequency invariance if turbo_freq/base_freq gives 0 (diff)
psi: eliminate kthread_worker from psi trigger scheduling mechanism
Each psi group requires a dedicated kthread_delayed_work and kthread_worker. Since no other work can be performed using psi_group's kthread_worker, the same result can be obtained using a task_struct and a timer directly. This makes psi triggering simpler by removing lists and locks involved with kthread_worker usage and eliminates the need for poll_scheduled atomic use in the hot path. Signed-off-by: Suren Baghdasaryan <surenb@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20200528195442.190116-1-surenb@google.com
Diffstat (limited to '')
1 files changed, 4 insertions, 3 deletions
diff --git a/include/linux/psi_types.h b/include/linux/psi_types.h
index 4b7258495a04..b95f3211566a 100644
--- a/include/linux/psi_types.h
+++ b/include/linux/psi_types.h
@@ -153,9 +153,10 @@ struct psi_group {
unsigned long avg[NR_PSI_STATES - 1][3];
/* Monitor work control */
- atomic_t poll_scheduled;
- struct kthread_worker __rcu *poll_kworker;
- struct kthread_delayed_work poll_work;
+ struct task_struct __rcu *poll_task;
+ struct timer_list poll_timer;
+ wait_queue_head_t poll_wait;
+ atomic_t poll_wakeup;
/* Protects data used by the monitor */
struct mutex trigger_lock;