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

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Date:	Sat, 23 Jun 2012 00:44:25 -0700
From:	Joe Perches <joe@...ches.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	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

On Sat, 2012-06-23 at 08:13 +0200, Ingo Molnar wrote:
> * 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.

I think the new behavior an overall improvement.
It helps avoid multiple thread interleaving.

I suggested a fix to enable a printk buffered/non-buffered
mechanism with an optional printk_flush/pr_flush.

https://lkml.org/lkml/2012/6/21/305


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