How to get the log of cfq from the userspace

[Yuehai Xu]

Hi all,

I notice there are many log infos in cfq which uses cfq_log_cfqq,
however, how can I get these logs in the userspace? I tried blktrace,
but it seems that this tool doesn't provide the info from
cfq_log_cfqq.

Thanks!

Yuehai
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