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From: Tom Tromey <tromey@redhat.com>
To: Hui Zhu <teawater@gmail.com>
Cc: linux-kernel@vger.kernel.org, Michael Snyder <msnyder@vmware.com>,        Marc Khouzam <marc.khouzam@ericsson.com>,        Thiago Jung Bauermann <thiago.bauermann@gmail.com>,        Steven <mqyoung@gmail.com>, colyli@gmail.com,        Christoph Hellwig <hch@infradead.org>,        "gdb\@sourceware.org" <gdb@sourceware.org>
Subject: Re: [PATCH] Linux Kernel GDB tracepoint module 2011-02-05
References: <AANLkTikhfhYjvmvXtjW-Mszpq8d_3Syo=H4zqWe+1hEg__12255.0142732964$1296923928$gmane$org@mail.gmail.com>	<m3hbcfzu9u.fsf@fleche.redhat.com>	<AANLkTinMx8mJYiDps3TuuaA1B4NLHi-PuCKm2=sTqyR0@mail.gmail.com>
Date: Tue, 08 Feb 2011 16:01:00 -0000
In-Reply-To: <AANLkTinMx8mJYiDps3TuuaA1B4NLHi-PuCKm2=sTqyR0@mail.gmail.com>	(Hui Zhu's message of "Tue, 8 Feb 2011 21:23:52 +0800")
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>>>>> ">" == Hui Zhu <teawater@gmail.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