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    SubjectRe: [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage based on semi-formal proof"
    On 05/23/2011 03:01 PM, Yinghai Lu wrote:
    > On 05/23/2011 02:25 PM, Paul E. McKenney wrote:
    >> On Mon, May 23, 2011 at 01:14:22PM -0700, Yinghai Lu wrote:
    >>> On 05/21/2011 07:08 AM, Paul E. McKenney wrote:
    >>>> On Sat, May 21, 2011 at 06:18:44AM -0700, Paul E. McKenney wrote:
    >>>>> On Fri, May 20, 2011 at 05:02:40PM -0700, Yinghai Lu wrote:
    >>>>>> On 05/20/2011 04:49 PM, Paul E. McKenney wrote:
    >>>>>>> On Fri, May 20, 2011 at 04:16:28PM -0700, Yinghai Lu wrote:
    >>>>>> ...
    >>>>>>>>
    >>>>>>>> the same one i sent out before, but let DEBUG_LOCKING_API_SELFTESTS disabled.
    >>>>>>>
    >>>>>>> OK, just to make sure I understand... You are compiling exactly the
    >>>>>>> same kernel source tree with exactly the same .config, just with two
    >>>>>>> different versions of gcc, correct?
    >>>>>> yes.
    >>>>>>>
    >>>>>>> If so, it is quite possible that the slow one is the correct one. :-/
    >>>>>> yeah, new version always have problem.
    >>>>>>
    >>>>>> looks like opensuse11.3 has 4.5.0 and fedora14 has 4.5.1
    >>>>>
    >>>>> OK, so fedora14 is the fast one (4.5.1) and opensuse11.3 is the slow
    >>>>> one (4.5.0), correct?
    >>>>
    >>>> And does commit c7a3786030 help? This commit (from Peter Zijlstra)
    >>>> tidied up RCU kthreads' scheduler interactions. The patch is below,
    >>>> though it is probably more convenient to pull it from the rcu/next
    >>>> branch of:
    >>>>
    >>>> git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu.git
    >>>>
    >>
    gcc in Fedora 14 is fine with your tree.

    Looks like I need to dump openuse 11.3 now.

    Thanks

    Yinghai


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