linux-kernel - Re: [PATCH v7 7/6] fs/epoll: scale nested callbacks

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Message-ID: <20171018154436.kyy6nbfn2qfm6dzq@linux-n805>
Date:   Wed, 18 Oct 2017 08:44:36 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Jason Baron <jbaron@...mai.com>
Cc:     Waiman Long <longman@...hat.com>, akpm@...ux-foundation.org,
        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 v7 7/6] fs/epoll: scale nested callbacks

On Wed, 18 Oct 2017, Jason Baron wrote:

>If there are not many EPOLL_CTL_ADDs, then I wouldn't think loop_ncalls
>would be highly contented (since it should only be called from the add
>path)?

So yeah it's all about the readywalks.

Thanks,
Davidlohr