btrfs-delalloc - threaded?

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Hi all.

I was doing some testing with writing out data to a BTFS filesystem
with the compress-force option.  With 1 program running, I saw
btfs-delalloc taking about 1 CPU worth of time, much as could be
expected.  I then started up 2 programs at the same time, writing data
to the BTRFS volume.  btrfs-delalloc still only used 1 CPU worth of
time.  Is btrfs-delalloc threaded, to where it can use more than 1 CPU
worth of time?  Is there a threshold where it would start using more
CPU?

Thanks for any information you can provide.

-- 
Andy Carlson
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