Re: [PATCH] printk: Add printk_flush() to force buffered text to console

[Fengguang Wu <fengguang.wu@intel.com>]

> I actually would like to make these more compact. As all my test box
> consoles go through serial ports, just booting through this takes more
> time the the compile itself.

The tests took 23 seconds boot time on one kernel:

        [    0.152934] Testing tracer nop: PASSED
        ...1577 lines total...
        [   23.206550] Testing kprobe tracing: OK

And 135 seconds in another bloated kernel:

        [  115.396441] Testing event 9p_client_req: OK
        ...2545 lines total...
        [  240.268783] Testing kprobe tracing: OK

I'd appreciate if the boot time can be reduced. Because I'm doing
kernel boot tests for *every single* commits.

It may look insane amount of work, but it's still manageable: with 10
kvm instances each take 1 minute to boot test a kernel, I can boot
test 60*24*10=14400 kernels in one day. That's a rather big number.
That allows me to run more cpu/vm/io stress tests for each kernel :-)

Thanks,
Fengguang