linux-kernel - Re: [PATCH v6 5/6] lib/dlock-list: Enable faster lookup with hashing

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Message-ID: <20171005110601.GA5131@linux-80c1.suse>
Date:   Thu, 5 Oct 2017 04:06:01 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Jan Kara <jack@...e.cz>
Cc:     Waiman Long <longman@...hat.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jan Kara <jack@...e.com>,
        Jeff Layton <jlayton@...chiereds.net>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andi Kleen <andi@...stfloor.org>,
        Dave Chinner <dchinner@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>
Subject: Re: [PATCH v6 5/6] lib/dlock-list: Enable faster lookup with hashing

On Thu, 05 Oct 2017, Jan Kara wrote:

>OK, this makes sense but do you have any particular user in mind? In
>particular I'm not sure how big advantage this API brings over an existing
>one in include/linux/list_bl.h. Sure it's a tradeoff between bitlock /
>spinlock but is there a user where it matters?

This was tailored with epoll nested callbacks in mind, we've been discussing
offline. I have not looked at list_bl.h nonetheless.

Thanks,
Davidlohr