linux-kernel - Re: [PATCH] shrink printk timestamp field

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Message-ID: <c384c5ea0808301047g7b3658can77b41e5906d306b6@mail.gmail.com>
Date:	Sat, 30 Aug 2008 19:47:06 +0200
From:	"Leon Woestenberg" <leon.woestenberg@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Joe Korty" <joe.korty@...r.com>, "mingo@...e.hu" <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] shrink printk timestamp field

Hello,

On Sat, Aug 30, 2008 at 7:16 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Sat, 30 Aug 2008 10:38:08 -0400 Joe Korty <joe.korty@...r.com> wrote:
>> On Fri, Aug 29, 2008 at 07:35:40PM -0400, Andrew Morton wrote:
>> > On Wed, 27 Aug 2008 11:17:59 -0400 Joe Korty <joe.korty@...r.com> wrote:
>> >
>> > > Shrink the printk timestamp field.
>>
>> I was looking at it from the point of view of finding out where the
>> boot process was too slow.  For that millisecs is enough.  I am not
>> sure where knowing printk output to the microsec would be useful for
>> solving anything.
>
> Of course it's useful.  If you're working on performance or latency in
> a disk, network or USB driver, microsecond resolution is about right.
>
I second this. If we have timestamps enables, let it be useful for all
current uses. The 3 digits extra are very cheap useful information in
that area (without resorting to more elaborate methods like the
recently merged latency tracer).

Rather than cut 3 digits off, maybe fix some of the too-wide prints
would solve the posters issue better.

Can we please have this patch non-committed or reverted?

Regards,
-- 
Leon
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