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SubjectRe: [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage based on semi-formal proof"
On Fri, May 20, 2011 at 04:09:22PM -0700, Yinghai Lu wrote:
> On 05/20/2011 03:42 PM, Paul E. McKenney wrote:
> > On Fri, May 20, 2011 at 02:04:06PM -0700, Yinghai Lu wrote:
> >> On 05/19/2011 02:37 PM, tip-bot for Paul E. McKenney wrote:
> >>> Commit-ID: 80d02085d99039b3b7f3a73c8896226b0cb1ba07
> >>> Gitweb: http://git.kernel.org/tip/80d02085d99039b3b7f3a73c8896226b0cb1ba07
> >>> Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
> >>> AuthorDate: Thu, 12 May 2011 01:08:07 -0700
> >>> Committer: Ingo Molnar <mingo@elte.hu>
> >>> CommitDate: Thu, 19 May 2011 23:25:29 +0200
> >>>
> >>> Revert "rcu: Decrease memory-barrier usage based on semi-formal proof"
> >>>
> >>> This reverts commit e59fb3120becfb36b22ddb8bd27d065d3cdca499.
> >>>
> >>> This reversion was due to (extreme) boot-time slowdowns on SPARC seen by
> >>> Yinghai Lu and on x86 by Ingo
> >>> .
> >>> This is a non-trivial reversion due to intervening commits.
> >>>
> >>> Conflicts:
> >>>
> >>> Documentation/RCU/trace.txt
> >>> kernel/rcutree.c
> >>>
> >>> Signed-off-by: Ingo Molnar <mingo@elte.hu>
> >>> ---
> >>> Documentation/RCU/trace.txt | 17 ++++--
> >>> kernel/rcutree.c | 130 ++++++++++++++++++++++++------------------
> >>> kernel/rcutree.h | 9 ++-
> >>> kernel/rcutree_plugin.h | 7 +-
> >>> kernel/rcutree_trace.c | 12 ++--
> >>> 5 files changed, 102 insertions(+), 73 deletions(-)
> >>>
> >>
> >> current tip/master that have this reverting and without setting DEBUG_LOCKING_API_SELFTESTS
> >>
> >> still get delay
> >>
> >> [ 35.419453] cpu_dev_init done
> >> [ 128.981770] memory_dev_init done
> >>
> >> should take only 3 or 4 seconds.
> >
> > Thank you for checking this out.
> >
> > This is with the same configuration you sent earlier? (Other than the
> > DEBUG_LOCKING_API_SELFTESTS, of course.)
> >
>
> 8 socket westmere-ex. and compiled with gcc from opensuse 11.3.
>
> if compile kernel from fedora 14, there will be not delay.

Thank you for the info. Could you please send me the .config files from
both builds?

Thanx, Paul


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