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| author |   Suren Baghdasaryan <surenb@google.com> | 2020-05-28 12:54:42 -0700 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2020-06-15 14:10:03 +0200 |
| commit | 461daba06bdcb9c7a3f92b9bbd110e1f7d093ffc (patch) | |
| tree | 83809825cabcd8d1ea54efb4d57e72266153fb19 /include/linux | |
| parent | x86, sched: Bail out of frequency invariance if turbo_freq/base_freq gives 0 (diff) | |
| download | linux-dev-461daba06bdcb9c7a3f92b9bbd110e1f7d093ffc.tar.xz linux-dev-461daba06bdcb9c7a3f92b9bbd110e1f7d093ffc.zip | |
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 '')
| -rw-r--r-- | include/linux/psi_types.h | 7 |
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; |