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SubjectHigh 'Creating block layer request' or '[sleep_on_page] ' latency
Hi all,

I have observed many high 'Creating block layer request' or
'[sleep_on_page] ' latency on Linux 3.2.4 and btrfs.

Cause Maximum Percentage
synchronous write 14590.0 msec 5.9 %
[btrfs_pin_log_trans] 12743.8 msec 7.8 %
[lock_rename] 2624.6 msec 1.1 %
Creating a file 1835.7 msec 3.2 %
Creating block layer request 1835.2 msec 53.8 %
Reading directory content 1674.0 msec 4.8 %
[sleep_on_page] 1661.9 msec 21.0 %
Reading from file 1626.9 msec 2.2 %
Opening file 118.7 msec 0.2 %

Cause Maximum Percentage
Creating block layer request 3716.4 msec 55.1 %
[sleep_on_page] 606.5 msec 27.7 %
Reading from file 571.9 msec 4.4 %
Page fault 550.8 msec 6.8 %
Pagecache sync readahead 108.3 msec 0.2 %
synchronous write 103.0 msec 0.8 %
Creating a file 88.3 msec 3.1 %
[btrfs_tree_lock] 58.2 msec 0.1 %
[btrfs_pin_log_trans] 33.8 msec 0.1 %

Is there something wrong ?

Regards,
Dongsheng


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