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

[Shaohua Li]

On Fri, Aug 13, 2010 at 06:22:00AM +0800, bchociej@xxxxxxxxx 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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