linux-kernel - Re: [PATCH 2/2] fsnotify: turn fsnotify reaper thread into a workqueue job

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Message-ID: <20160215060310.GD29898@eguan.usersys.redhat.com>
Date:	Mon, 15 Feb 2016 14:03:10 +0800
From:	Eryu Guan <guaneryu@...il.com>
To:	Jeff Layton <jlayton@...chiereds.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Jan Kara <jack@...e.com>, Eric Paris <eparis@...isplace.org>
Subject: Re: [PATCH 2/2] fsnotify: turn fsnotify reaper thread into a
 workqueue job

On Sun, Feb 14, 2016 at 07:15:23PM -0500, Jeff Layton wrote:
> We don't require a dedicated thread for fsnotify cleanup. Switch it over
> to a workqueue job instead that runs on the system_unbound_wq.
> 
> In the interest of not thrashing the queued job too often when there are
> a lot of marks being removed, we delay the reaper job slightly when
> queueing it, to allow several to gather on the list.
> 
> Cc: Jan Kara <jack@...e.com>
> Cc: Eric Paris <eparis@...isplace.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Eryu Guan <guaneryu@...il.com>
> Signed-off-by: Jeff Layton <jeff.layton@...marydata.com>

With these two patches applied on top of r.5-rc3, the same test passed
2-hour stress run, also survived stress test that forks 5 processes
running the same test program for 30 minutes.

Thanks for looking into this!

Eryu