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Message-ID: <CAE8XmWo6vyL69hA+sHUygit7x3DF2yHUNttCM9iSuRq=TWGx0A@mail.gmail.com> Date: Sun, 5 Feb 2012 12:20:51 +0800 From: Dongsheng Song <dongsheng.song@...il.com> To: linux-kernel@...r.kernel.org Subject: High '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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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