linux-ext4 - Re: [RFC v2 07/10] vfs: fork one kthread to update data temperature

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Message-ID: <20120927070117.GR15236@dastard>
Date:	Thu, 27 Sep 2012 17:01:17 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Zhi Yong Wu <zwu.kernel@...il.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-btrfs@...r.kernel.org, linux-ext4@...r.kernel.org,
	linuxram@...ux.vnet.ibm.com, viro@...iv.linux.org.uk,
	cmm@...ibm.com, tytso@....edu, marco.stornelli@...il.com,
	stroetmann@...olinux.com, diegocg@...il.com, chris@...muel.org,
	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: Re: [RFC v2 07/10] vfs: fork one kthread to update data temperature

On Thu, Sep 27, 2012 at 02:54:22PM +0800, Zhi Yong Wu wrote:
> On Thu, Sep 27, 2012 at 12:03 PM, Dave Chinner <david@...morbit.com> wrote:
> > On Sun, Sep 23, 2012 at 08:56:32PM +0800, zwu.kernel@...il.com wrote:
> >> From: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
> >>
> >>   Fork and run one kernel kthread to calculate
> >> that temperature based on some metrics kept
> >> in custom frequency data structs, and store
> >> the info in the hash table.
> >
> > No new kthreads, please. Use a per-superblock workqueue and a struct
> > delayed_work to run periodic work on each superblock.
> If no new kthread is created, which kthread will work on these
> delayed_work tasks?

One of the kworker threads that service the workqueue
infrastructure.

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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