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

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

> 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
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