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I am trying to understand the SATA Host-Device Communication and for that I have put a lot of debug messages in the kernel driver code. Now messages are in such a huge amount that I am not able to see the initial messages of the device enumeration in the dmesg log. For the same I have modified CONFIG_LOG_BUF_SHIFT(=21) config variable to increase the ring buffer size from where dmesg takes the message but still I am facing the same issue.

So, Is there any method available by which I can log all the dmesg from the kernel boot in to a specific file?

Thanks for the Help in advance.

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You can use:

cat /var/log/dmesg > file.txt

and use:

head /var/log/dmesg

if you want to see the first lines of dmesg.

See too 'man head' for more specifications. The '>' symbol redirect the ouput of 'cat' to the 'file.txt'

  • Thanks for the reply this method I know and tried but it didn't help I want all the messages from start of dmesg. e.g. from "[ 0.000000] Initializing cgroup subsys cpuset" – Hemant Feb 12 '16 at 4:36

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