linux-kernel - Re: [PATCH v8 0/6] vfs: Use dlock list for SB's s

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Message-ID: <4449fb7f-28de-62d2-2101-355096617e41@redhat.com>
Date:   Sun, 25 Feb 2018 23:05:07 -0500
From:   Waiman Long <longman@...hat.com>
To:     Dave Chinner <david@...morbit.com>
Cc:     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>,
        Davidlohr Bueso <dave@...olabs.net>
Subject: Re: [PATCH v8 0/6] vfs: Use dlock list for SB's s_inodes list

On 02/25/2018 09:47 PM, Dave Chinner wrote:
> Hi Waiman,
>
> What's happened to this patchset? Any plans to repost a more recent
> version?
>
> FYI, I just ran a workload that hit 60% CPU usage on sb inode list
> lock contention - a multithreaded bulkstat scan of an XFS filesystem
> with millions of inodes on SSDs. last time I ran this (about 18
> months ago now!) I saw rates of about 600,000 inodes/s being scanned
> from userspace. The run I did earlier today made 300,000 inodes/s on
> the same 16p machine and was completely CPU bound....
>
> Cheers,
>
> Dave.

I was planning to repost the patchset with the latest change last
November and then Meltdown/Spectre happened. I was drafted into
backporting fixes to RHEL6. Hopefully, I can finish up the work in early
March and work on my upstream patches again.

Cheers,
Longman