linux-kernel - Re: [RFC][PATCH 6/7] freelist: Lock less freelist

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Message-ID: <20200827165605.GL1362448@hirez.programming.kicks-ass.net>
Date:   Thu, 27 Aug 2020 18:56:05 +0200
From:   peterz@...radead.org
To:     Cameron <cameron@...dycamel.com>
Cc:     linux-kernel@...r.kernel.org, mhiramat@...nel.org,
        Eddy_Wu@...ndmicro.com, x86@...nel.org, davem@...emloft.net,
        rostedt@...dmis.org, naveen.n.rao@...ux.ibm.com,
        anil.s.keshavamurthy@...el.com, linux-arch@...r.kernel.org,
        oleg@...hat.com, will@...nel.org, paulmck@...nel.org
Subject: Re: [RFC][PATCH 6/7] freelist: Lock less freelist

On Thu, Aug 27, 2020 at 12:49:20PM -0400, Cameron wrote:
> For what it's worth, the freelist.h code seems to be a faithful adaptation
> of my original blog post code. Didn't think it would end up in the Linux
> kernel one day :-)

Hehe, I ran into the traditional ABA problem for the lockless stack and
asked google, your blog came up.

I'll try and actually think about it a little when the current (virtual)
conference is over.

Are you Ok with the License I put on it, GPLv2 or BDS-2 ?

> I'm just wondering if the assumption that "nodes are never freed until
> after the free list is destroyed" will hold true in the intended use case?

It does, the nodes are only deleted once the whole freelist object is
discarded.