From: Tejun Heo <tj@kernel.org>
To: Waiman Long <longman@redhat.com>
Cc: "Jens Axboe" <axboe@kernel.dk>,
cgroups@vger.kernel.org, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org, "Ming Lei" <ming.lei@redhat.com>,
"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Michal Koutný" <mkoutny@suse.com>
Subject: Re: [PATCH v7 1/3] llist: Add a lock-less list variant terminated by a sentinel node
Date: Mon, 3 Oct 2022 06:57:37 -1000 [thread overview]
Message-ID: <YzsUgY4CC0SH8Sl2@slm.duckdns.org> (raw)
In-Reply-To: <006ebc52-ab37-442a-9ba3-e7b8dff53fab@redhat.com>
On Mon, Oct 03, 2022 at 12:55:24PM -0400, Waiman Long wrote:
> That was my original plan. However, after looking at some existing users of
> lockless list, they have coded in the dependency on the fact that a lockless
> list is empty if it is NULL. I guess I can make this true also for the new
> lockless list with sentinel at the expense of a bit more overhead in the
> entry insertion path and deletion path. I will take a further look at that.
There aren't that many users of llist. Maybe it'd be easier / cleaner to
introduce a macro to test whether a llist is empty and replace the NULL
tests?
Thanks.
--
tejun
next prev parent reply other threads:[~2022-10-03 16:57 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-03 15:44 [PATCH v7 0/3] blk-cgroup: Optimize blkcg_rstat_flush() Waiman Long
2022-10-03 15:44 ` [PATCH v7 1/3] llist: Add a lock-less list variant terminated by a sentinel node Waiman Long
2022-10-03 16:40 ` Tejun Heo
2022-10-03 16:55 ` Waiman Long
2022-10-03 16:57 ` Tejun Heo [this message]
2022-10-03 17:32 ` Waiman Long
2022-10-03 17:36 ` Tejun Heo
2022-10-03 17:40 ` Waiman Long
2022-10-03 19:39 ` Waiman Long
2022-10-03 20:15 ` Tejun Heo
2022-10-08 2:15 ` Huang, Ying
2022-10-03 15:44 ` [PATCH v7 2/3] blk-cgroup: Return -ENOMEM directly in blkcg_css_alloc() error path Waiman Long
2022-10-03 16:40 ` Tejun Heo
2022-10-03 15:44 ` [PATCH v7 3/3] blk-cgroup: Optimize blkcg_rstat_flush() Waiman Long
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