From: Mathieu Desnoyers via lttng-dev <lttng-dev@lists.lttng.org>
To: Lego Lin <lego.lin@gmail.com>
Cc: lttng-dev <lttng-dev@lists.lttng.org>
Subject: Re: [lttng-dev] Using rculist for dirty tracking
Date: Fri, 7 Aug 2020 12:36:27 -0400 (EDT) [thread overview]
Message-ID: <1009482720.2512.1596818187667.JavaMail.zimbra@efficios.com> (raw)
In-Reply-To: <CALR1Az+iE_0smhqj2saNsc0+KFPVSrH+ki59gKc4NjVvYdVkQA@mail.gmail.com>
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----- 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
> _______________________________________________
> lttng-dev mailing list
> lttng-dev@lists.lttng.org
> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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prev parent reply other threads:[~2020-08-07 16:36 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-07 7:24 [lttng-dev] Using rculist for dirty tracking Lego Lin via lttng-dev
2020-08-07 16:36 ` Mathieu Desnoyers via lttng-dev [this message]
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