[weird] High CPU usage caused by btrfs-transaction thread busy doing find_next_zero_bit()

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Dear devs,

My filesystem is super-sluggish since about a week, and perf top tells me
that find_next_bit(), find_next_zero_bit() is eating my netbook's CPU.

The kernel is 3.3-rc3+188 (g3ec1e88) and I don't use this laptop a lot,
so I'm ready to cooperate.

In the btrfs-transaction thread, in descending order of CPU usage:
find_next_zero_bit, find_next_bit, rb_next, setup_cluster_bitmap,
setup_cluster_no_bitmap, tree_search_offset.

I'm on #btrfs (Zougloub)

Regards,

-- 
cJ
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