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@xxxxxxxxxxxxxxxxxx> >>> AuthorDate: Thu, 12 May 2011 01:08:07 -0700 >>> Committer: Ingo Molnar <mingo@xxxxxxx> >>> 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@xxxxxxx> >>> --- >>> 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. Thanks Yinghai -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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