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Date: Fri, 15 Jun 2012 12:22:33 +0800
From: Fengguang Wu <fengguang.wu@intel.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        "kay.sievers" <kay.sievers@vrfy.org>,
        "Paul E. McKenney" <paulmck@us.ibm.com>, Ingo Molnar <mingo@elte.hu>,
        Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] printk: Add printk_flush() to force buffered text to
 console
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> 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