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SubjectRe: [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage based on semi-formal proof"
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.

Thanks

Yinghai


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