Btrfs devel - Aug 2011 - Writes in idle/How to debug filesystem activity

Hallo list,

I use btrfs on a SD card. When my computer is running in idle (i.e. 
nothing running but wmii and a few background tasks that don''t do any 
i/o; freshly synced), from time to time some [btrfs-*] tasks do writes 
(for 5 seconds or so).  What are those processes doing on my disk, 
having nothing to write/read? That leads to the second question: How can 
I debug file system activity in inotify style?

Thanks,
Jonas
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> I use btrfs on a SD card. When my computer is running in idle (i.e.
> nothing running but wmii and a few background tasks that don''t do
any
> i/o; freshly synced), from time to time some [btrfs-*] tasks do writes
> (for 5 seconds or so).  What are those processes doing on my disk,
> having nothing to write/read? That leads to the second question: How can
> I debug file system activity in inotify style?
There was once a similar thread about this issue; unfortunately, without 
any constructive answers:

http://thread.gmane.org/gmane.comp.file-systems.btrfs/10840


-- 
Tomasz Chmielewski
http://wpkg.org

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> There was once a similar thread about this issue; unfortunately, without
any
> constructive answers:
>
> http://thread.gmane.org/gmane.comp.file-systems.btrfs/10840
I believe sync does a transaction commit every time.
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