----- On Aug 7, 2020, at 3:24 AM, lttng-dev <lttng-dev@lists.lttng.org> wrote:

Hi,
I am new for using rcu and I need some helps for integrating user space rcu into my project for solving performance issue.
In my project, I create 2 link list - one for free pool, one for using pool.
Free pool used to hold a segment of memory that no-one use.
Using pool used to hold a segment of memory that someone use.
Originally, I use a pthread_spin_lock to protect
1. alloc memory segment from free pool, and move memory segment from free pool to using pool
2. free memory segment from using pool, and move memory segment from free pool to using pool

I suspect we would need to know the entire intended design here in order to start

a discussion. What operations are doing list traversals ? What operations are doing

updates ? How frequently are each respective operation done ? Do you intend to

keep your spin lock to protect concurrent list updates, and if not how do you plan on

protecting concurrent updates ?

What are the performance issues you are experiencing exactly ?

Thanks,

Mathieu

For RCU, I change the list_move_tail as following
cds_list_for_each_entry_safe(cur, next, &(membk_pool->bk_free_pool), entry_pool) {
cds_list_del_rcu(&cur->entry_pool);
urcu_bp_synchronize_rcu();
cds_list_add_tail_rcu(&ret->entry_pool, &(membk_pool->bk_using_pool));
}

Is it ok to use scenario like this?

Meanwhile, that are some advance list operation API:
1. list_first_entry
2. list_first_entry_or_null
Is it possible to integrate these into current urcu?

Thanks

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Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com