linux-kernel - Re: [RFC v2 PATCH 0/6] Btrfs: Add hot data relocation functionality

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Message-ID: <20100826021343.GA452@sli10-conroe.sh.intel.com>
Date:	Thu, 26 Aug 2010 10:13:43 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	"bchociej@...il.com" <bchociej@...il.com>
Cc:	"chris.mason@...cle.com" <chris.mason@...cle.com>,
	"linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"cmm@...ibm.com" <cmm@...ibm.com>,
	"bcchocie@...ibm.com" <bcchocie@...ibm.com>,
	"mrlupfer@...ibm.com" <mrlupfer@...ibm.com>,
	"crscott@...ibm.com" <crscott@...ibm.com>,
	"mlupfer@...il.com" <mlupfer@...il.com>,
	"conscott@...edu" <conscott@...edu>
Subject: Re: [RFC v2 PATCH 0/6] Btrfs: Add hot data relocation functionality

On Fri, Aug 13, 2010 at 06:22:00AM +0800, bchociej@...il.com wrote:
> 
> - Hooks in existing Btrfs functions to track data access frequency
>   (btrfs_direct_IO, btrfs_readpages, and extent_write_cache_pages)
> 
> - New rbtrees for tracking access frequency of inodes and sub-file
>   ranges (hotdata_map.c)
> 
> - A hash list for indexing data by its temperature (hotdata_hash.c)
> 
> - A debugfs interface for dumping data from the rbtrees (debugfs.c)
> 
> - A background kthread for relocating data to faster media based on
>   temperature
Hi,
I'm wondering if the temperature info can be exported to userspace, and
let a daemon to do the relocation (by ioctl). A userspace daemon is more
flexible.

Thanks,
Shaohua
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