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Date: Sat, 2 Jan 2010 04:56:46 +0100
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>, Lin Ming <ming.m.lin@intel.com>,
       mingo@elte.hu, tglx@linutronix.de,
       linux-kernel <linux-kernel@vger.kernel.org>,
       "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Subject: Re: tbench regression with 2.6.33-rc1
Message-ID: <20100102035644.GC5238@nowhere>
References: <1261739467.10685.18.camel@minggr.sh.intel.com> <1261902760.6201.33.camel@marge.simson.net> <1261904349.15854.2.camel@laptop> <1261906883.5451.1.camel@marge.simson.net> <1261908662.15854.4.camel@laptop>
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On Sun, Dec 27, 2009 at 11:11:02AM +0100, Peter Zijlstra wrote:
> On Sun, 2009-12-27 at 10:41 +0100, Mike Galbraith wrote:
> > On Sun, 2009-12-27 at 09:59 +0100, Peter Zijlstra wrote:
> > > On Sun, 2009-12-27 at 09:32 +0100, Mike Galbraith wrote:
> > > > Perf also isn't free, and in 33, we lost the ability to config it out,
> > > 
> > > Uhm, that's a plain bug, we should be able to build a kernel without
> > > perf support, does the hw breakpoint support have an unfortunate select
> > > some place or something?
> > 
> > Yeah, it's selected in arch/x86/Kconfig.  The kernel won't build without
> > it either.
> 
> Came from this :/
> 
> Any way we can fix this? Frederic/Ingo?



No way I think.
breakpoints support by ptrace is a builtin option in x86 and
it's implemented on top of perf.

The only solution to solve this would be to make the breakpoints
support optional.