linux-kernel - Re: [PATCH v3] printk: Have printk() never buffer its data

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Message-ID: <20120626170232.GA2041@kroah.com>
Date:	Tue, 26 Jun 2012 10:02:32 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Kay Sievers <kay@...y.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Joe Perches <joe@...ches.com>,
	"Paul E. McKenney" <paulmck@...ibm.com>
Subject: Re: [PATCH v3] printk: Have printk() never buffer its data

On Tue, Jun 26, 2012 at 07:00:38PM +0200, Kay Sievers wrote:
> On Tue, Jun 26, 2012 at 6:58 PM, Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> > On Tue, Jun 26, 2012 at 06:07:36PM +0200, Kay Sievers wrote:
> >> On Mon, 2012-06-25 at 18:40 -0700, Linus Torvalds wrote:
> >> > On Mon, Jun 25, 2012 at 5:56 PM, Kay Sievers <kay@...y.org> wrote:
> >> > >
> >> > > Buffering has nice effects though:
> >> > > It makes continuation lines appear as one record in the buffer, not as
> >> > > n individual prints with n headers.
> >> >
> >> > As I already mentioned, buffering for *logging* is different from
> >> > buffering for *printing*.
> >> >
> >> > I think it might be a great idea to buffer for logging in order to
> >> > generate one individual buffer record there.
> >> >
> >> > But it needs to be printed as it is generated.
> >>
> >> That's a good idea.
> >>
> >> Something like this could work - only minimally tested at this moment.
> >
> > Hm, this doesn't boot for me, just hangs at startup :(
> 
> You have that patch against your tree? Let me try that, maybe it
> conflicts with one of the patches there ...

No, I applied to to a clean 3.5-rc4 (which boots fine on my laptop).

greg k-h
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