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Subject: Re: checkpatch.pl is getting too slow
From: Daniel Walker <dwalker@fifo99.com>
To: Andy Whitcroft <apw@canonical.com>
Cc: Greg KH <greg@kroah.com>, linux-kernel@vger.kernel.org
In-Reply-To: <20090131210220.GA25811@shadowen.org>
References: <20090131185507.GA3280@kroah.com>
	 <20090131210220.GA25811@shadowen.org>
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Date: Sat, 31 Jan 2009 13:35:19 -0800
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On Sat, 2009-01-31 at 21:02 +0000, Andy Whitcroft wrote:
> On Sat, Jan 31, 2009 at 10:55:07AM -0800, Greg KH wrote:
> > Hi Andy,
> > 
> > I've noticed that checkpatch.pl is getting slower and slower when run on
> > a whole file, but yesterday I realized that it now is pretty much
> > unusable:
> > 
> > $ time ./scripts/checkpatch.pl --file drivers/staging/uc2322/aten2011.c
> > 
> > <snip>
> > total: 168 errors, 126 warnings, 3939 lines checked
> > 
> > drivers/staging/uc2322/aten2011.c has style problems, please review.  If any of these errors
> > are false positives report them to the maintainer, see
> > CHECKPATCH in MAINTAINERS.
> > 
> > real	8m7.924s
> > user	8m7.058s
> > sys	0m0.116s
> 
> That is scarey indeed.  Something is very wrong in there if it went back
> to a more reasonable 10's of seconds with a few patches.  I will have a
> look at the file you attached and see what I can find.
> 
> Thanks for the heads up.

The way your doing updates makes bisecting this code way too difficult..
I bisected this down to the commit for version 0.15 , but if you had all
the 0.15 patches as discrete git commits I could have actually found the
specific patch causing the problem ..

Could you start doing one fix or change per git commit?

Daniel

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