* high cpu usage due to btrfs_find_space_for_alloc and rb_next
@ 2017-02-18 7:16 Stefan Priebe - Profihost AG
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From: Stefan Priebe - Profihost AG @ 2017-02-18 7:16 UTC (permalink / raw)
To: linux-btrfs@vger.kernel.org
Hi,
is there any chance to optimize btrfs_find_space_for_alloc / rb_next on
big devices?
I've plenty of free space but most of the time there's only low I/O but
high cpu usage. perf top shows:
60,41% [kernel] [k] rb_next
9,74% [kernel] [k] btrfs_find_space_for_alloc
5,55% [kernel] [k] tree_search_offset.isra.25
# btrfs filesystem df /backup/
Data, single: total=14.85TiB, used=14.37TiB
System, single: total=32.00MiB, used=2.27MiB
Metadata, single: total=63.00GiB, used=54.87GiB
GlobalReserve, single: total=512.00MiB, used=80.17MiB
--
Stefan
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2017-02-18 7:16 high cpu usage due to btrfs_find_space_for_alloc and rb_next Stefan Priebe - Profihost AG
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