On Tue, 4 Feb 2014 09:12:54 -0500
Josef Bacik <jbacik@xxxxxx> wrote:
> Hrm I was hoping that was going to be more helpful. Can you get perf
> record -ag and then perf report while it's at full cpu and get the
> first 3 or 4 things with their traces?
Here it comes:
# ========
# captured on: Wed Feb 5 00:11:41 2014
# ========
#
no symbols found in /usr/sbin/acpid, maybe install a debug package?
unexpected end of event stream
# Samples: 168K of event 'cycles'
# Event count (approx.): 126847081763
#
# Overhead Command Shared Object Symbol
# ........ ............... .......................... ...............................................................................................
#
18.48% btrfs-freespace [kernel.kallsyms] [k] state_store
|
--- state_store
10.25% btrfs-freespace [kernel.kallsyms] [k] sys_sched_rr_get_interval
|
--- sys_sched_rr_get_interval
9.02% btrfs-freespace [kernel.kallsyms] [k] rt_mutex_slowunlock
|
--- rt_mutex_slowunlock
8.76% btrfs-freespace [kernel.kallsyms] [k] btrfs_submit_compressed_write
|
--- btrfs_submit_compressed_write
6.63% btrfs-freespace [kernel.kallsyms] [k] sched_show_task
|
--- sched_show_task
5.19% btrfs-freespace [kernel.kallsyms] [k] find_free_extent
|
--- find_free_extent
5.15% btrfs-freespace [kernel.kallsyms] [k] trace_print_graph_duration
|
--- trace_print_graph_duration
> I'm going to try and
> reproduce today, is there anything special about your fs?
> Compression, large blocksizes, skinny metadata? Thanks,
Filesystem was created with -l 32768 -n 32768 and skinny metadata enabled.
regards,
Johannes
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