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From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>
Cc: paulmck <paulmck@kernel.org>,
	Josh Triplett <josh@joshtriplett.org>, rcu <rcu@vger.kernel.org>,
	rostedt <rostedt@goodmis.org>,
	Lai Jiangshan <jiangshanlai@gmail.com>
Subject: Re: Question about list_sort() RCU version.
Date: Tue, 16 Jun 2020 16:24:44 -0400 (EDT)	[thread overview]
Message-ID: <1909772924.4639.1592339084357.JavaMail.zimbra@efficios.com> (raw)
In-Reply-To: <BYAPR04MB4965874567CDA672B704ABCC869D0@BYAPR04MB4965.namprd04.prod.outlook.com>

----- On Jun 16, 2020, at 4:17 PM, Chaitanya Kulkarni Chaitanya.Kulkarni@wdc.com wrote:

> Hi RCU maintainers and experts,
> 
> I'm working on a linux kernel upstream project which is in the tree.
> With the POC I can already see that significant performance improvement
> with RCU in the fast path which are replacing rw semaphore, but not
> having list_sort() rcu variant is blocking the developement and getting
> code upstream.

Why do you need list_sort() ? Is there any way you could simply insert your
new elements into the list in already-sorted order ? This would ensure that
the list is always in a sorted state, which I suspect will be expected by
RCU readers.

Thanks,

Mathieu


> 
> I was not able to find the such helper implemented for the RCU flavor of
> list.
> 
> Can someone provide information about :-
> 
> 1. Is there any plan to have list_sort_rcu() ? if so when can we expect
>    that ? (Also how can I help ?)
> 
> 2. In case there is no plan what are design considerations if someone
>    wants to implement the code and submit it upstream ?
>    (Also how can I help here ?
-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com

  reply	other threads:[~2020-06-16 20:24 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-16 20:17 Question about list_sort() RCU version Chaitanya Kulkarni
2020-06-16 20:24 ` Mathieu Desnoyers [this message]
2020-06-16 20:45   ` Chaitanya Kulkarni
2020-06-16 21:47 ` Steven Rostedt
2020-06-16 22:26   ` Chaitanya Kulkarni
2020-06-16 22:29   ` Paul E. McKenney
2020-06-16 23:21     ` Chaitanya Kulkarni

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