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Date: Wed, 28 Jan 2015 09:41:06 -0800 (PST)
From: Don Lewis <truckman@FreeBSD.org>
Subject: Re: svn commit: r277828 - in head/sys: fs/tmpfs vm
To: kib@FreeBSD.org
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On 28 Jan, Konstantin Belousov wrote:
> Author: kib
> Date: Wed Jan 28 10:37:23 2015
> New Revision: 277828
> URL: https://svnweb.freebsd.org/changeset/base/277828
> 
> Log:
>   Update mtime for tmpfs files modified through memory mapping.  Similar
>   to UFS, perform updates during syncer scans, which in particular means
>   that tmpfs now performs scan on sync.  Also, this means that a mtime
>   update may be delayed up to 30 seconds after the write.

Maybe disable the scan if mounted noatime?