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

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Date:	Mon, 21 Dec 2009 19:18:37 +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 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.

Ananth

[1] http://sourceware.org/systemtap/wiki/utrace/tests
[2] detach-stopped and stopped-attach-transparency are the additional
    failures. syscall-reset fails in both cases.

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