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| author |   Paul E. McKenney <paulmck@kernel.org> | 2021-11-09 11:11:32 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-12-09 10:13:55 -0800 |
| commit | 8dd593fddd630e7dcbe79e98ff5e0d0561e9ff27 (patch) | |
| tree | e74f6f627cad501260d77124d1ac45035167e44c /kernel/rcu | |
| parent | rcu-tasks: Inspect stalled task's trc state in locked state (diff) | |
| download | linux-dev-8dd593fddd630e7dcbe79e98ff5e0d0561e9ff27.tar.xz linux-dev-8dd593fddd630e7dcbe79e98ff5e0d0561e9ff27.zip | |
rcu-tasks: Add a ->percpu_enqueue_lim to the rcu_tasks structure
This commit adds a ->percpu_enqueue_lim field to the rcu_tasks structure.
This field contains two to the power of the ->percpu_enqueue_shift
field, easing construction of iterators over the per-CPU queues that
might contain RCU Tasks callbacks. Such iterators will be introduced
in later commits.
Reported-by: Martin Lau <kafai@fb.com>
Cc: Neeraj Upadhyay <neeraj.iitr10@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tasks.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index c11f4e646bf1..608af87a5065 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -52,6 +52,7 @@ struct rcu_tasks_percpu { * @call_func: This flavor's call_rcu()-equivalent function. * @rtpcpu: This flavor's rcu_tasks_percpu structure. * @percpu_enqueue_shift: Shift down CPU ID this much when enqueuing callbacks. + * @percpu_enqueue_lim: Number of per-CPU callback queues in use. * @name: This flavor's textual name. * @kname: This flavor's kthread name. */ @@ -76,6 +77,7 @@ struct rcu_tasks { call_rcu_func_t call_func; struct rcu_tasks_percpu __percpu *rtpcpu; int percpu_enqueue_shift; + int percpu_enqueue_lim; char *name; char *kname; }; @@ -93,6 +95,7 @@ static struct rcu_tasks rt_name = \ .rtpcpu = &rt_name ## __percpu, \ .name = n, \ .percpu_enqueue_shift = ilog2(CONFIG_NR_CPUS), \ + .percpu_enqueue_lim = 1, \ .kname = #rt_name, \ } @@ -172,6 +175,7 @@ static void cblist_init_generic(struct rcu_tasks *rtp) raw_spin_lock_irqsave(&rtp->cbs_gbl_lock, flags); rtp->percpu_enqueue_shift = ilog2(nr_cpu_ids); + rtp->percpu_enqueue_lim = 1; for_each_possible_cpu(cpu) { struct rcu_tasks_percpu *rtpcp = per_cpu_ptr(rtp->rtpcpu, cpu); |