linux-kernel - Re: [PATCH] Linux Kernel GDB tracepoint module 2011-02-05

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Message-ID: <m3y65qv7m8.fsf@fleche.redhat.com>
Date:	Tue, 08 Feb 2011 09:00:47 -0700
From:	Tom Tromey <tromey@...hat.com>
To:	Hui Zhu <teawater@...il.com>
Cc:	linux-kernel@...r.kernel.org, Michael Snyder <msnyder@...are.com>,
	Marc Khouzam <marc.khouzam@...csson.com>,
	Thiago Jung Bauermann <thiago.bauermann@...il.com>,
	Steven <mqyoung@...il.com>, colyli@...il.com,
	Christoph Hellwig <hch@...radead.org>,
	"gdb\@sourceware.org" <gdb@...rceware.org>
Subject: Re: [PATCH] Linux Kernel GDB tracepoint module 2011-02-05

>>>>> ">" == Hui Zhu <teawater@...il.com> writes:

>> My gcc is 4.4.5.  Does it have VTA?

Nope.  VTA went in for 4.5.

>> Use the patch is easier than update gcc sometimes, right?  :)

Yeah.

>> BTW does VTA can handle the issue that after -O2 a lot of code
>> execution order is worong?
>> It affect me when I debug the Linux Kernel in qemu.

My understanding is that VTA is solely about better tracking of values
through optimization passes.  It doesn't affect code reordering, by
design.

Tom
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