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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 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.)

Thanx, Paul


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