Re: What are thoses [btrfs-cache-nnn] kernel threads ?

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On Thu, May 19, 2011 at 2:26 PM, Josef Bacik <josef@xxxxxxxxxx> wrote:
>
> Yeah so this is a crappy thing about btrfs, we need to cache free space, so we
> have to run these threads to read the extent tree to put together the free space
> cache.  You can get around this by moving to a new kernel and mounting with
>
> -o space_cache
>
> This will enable the space caching feature, so you will get those threads once,
> but then every time after that it will be fast and you shouldn't see those
> threads at all.  Its a disk format change, so you only have to mount -o
> space_cache once and then it will be permament.  Thanks,
>
> Josef
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Out of curiosity, why isn't this done automatically as opposed to
having to mount with the space_cache option?
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