linux-kernel - Re: [PATCH 6/7] implement utrace-ptrace

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Message-ID: <20091221135043.GC12670@in.ibm.com>
Date:	Mon, 21 Dec 2009 19:20:43 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org, utrace-devel@...hat.com
Subject: Re: [PATCH 6/7] implement utrace-ptrace

On Mon, Dec 21, 2009 at 07:18:37PM +0530, Ananth N Mavinakayanahalli wrote:
> On Fri, Dec 18, 2009 at 02:11:40AM +0100, Oleg Nesterov wrote:
> > The patch adds the new file, kernel/ptrace-utrace.c, which contains
> > the new implementation of ptrace over utrace.
> > 
> > This file is not compiled until we have CONFIG_UTRACE option, will be
> > added by the next "utrace core" patch.
> > 
> > It's supposed to be an invisible implementation change, nothing should
> > change to userland when CONFIG_UTRACE is enabled.
> > 
> > Signed-off-by: Roland McGrath <roland@...hat.com>
> > Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> > ---
> 
> Oleg,
> 
> ptrace/utrace performs better with the ptrace-tests [1] testsuite (1 failure
> vs. 3 with vanilla ptrace [1]). The gdb testsuite also has no
> regressions. In fact, the results on the gdb testsuite are identical.

Forgot to mention the tests were on powerpc.
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