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

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Date:	Sat, 23 Jun 2012 08:13:13 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"kay.sievers" <kay.sievers@...y.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] printk: Add printk_flush() to force buffered text to
 console


* Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Thu, 21 Jun 2012 19:52:03 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > But with the new printk() changes, text without a newline 
> > gets buffered and does not print out to the console at the 
> > location of the printk.
> 
> uh, how about we fix that?  The old behaviour was good, the 
> new behaviour is noxious.

Absolutely.

pr_flush() really seems to be a workaround.

> Please idenfity these "new printk() changes".  Was the new 
> noxiousness an unavoidable effect of them?

Fundamentally:

e2ae715d66bf kmsg - kmsg_dump() use iterator to receive log buffer content
c313af145b9b printk() - isolate KERN_CONT users from ordinary complete lines
3ce9a7c0ac28 printk() - restore prefix/timestamp printing for multi-newline strings
649e6ee33f73 printk() - restore timestamp printing at console output
5c5d5ca51abd printk() - do not merge continuation lines of different threads
7f3a781d6fd8 printk - fix compilation for CONFIG_PRINTK=n
5fc3249068c1 kmsg: use do_div() to divide 64bit integer
e11fea92e13f kmsg: export printk records to the /dev/kmsg interface
7ff9554bb578 printk: convert byte-buffer to variable-length record buffer

Should we revert them or can they be fixed sanely? Kay seems to 
be busy with other things so I guess a revert is the best we can 
do. Greg, Kay?

Thanks,

	Ingo
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