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I found some kernel performance regression issues that might be related w/ 4.14.y LTS commit.
4.14.y commit: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v...
The issue is observed when "console=" is used as a kernel parameter to disable the kernel console.
I browsed android common kernel logs and the upstream stable kernel tree, found some related changes.
printk: handle blank console arguments passed in. (link: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v...) Revert "init/console: Use ttynull as a fallback when there is no console" (link: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v...)
It looks like upstream also noticed the regression introduced by the commit, and the workaround is to use "ttynull" to handle "console=" case. But the "ttynull" was reverted due to some other reasons mentioned in the commit message.
Any insight or recommendation will be appreciated.
Thanks, Yi Fan