From: Ingo Molnar <mingo@elte.hu>
To: Yinghai Lu <yinghai@kernel.org>
Cc: paulmck@linux.vnet.ibm.com, linux-kernel@vger.kernel.org
Subject: Re: [GIT PULL rcu/next] rcu commits for 2.6.40
Date: Fri, 13 May 2011 10:42:53 +0200 [thread overview]
Message-ID: <20110513084253.GE13647@elte.hu> (raw)
In-Reply-To: <4DCC894D.3070204@kernel.org>
* Yinghai Lu <yinghai@kernel.org> wrote:
> more info:
> if only reverting: e59fb3120becfb36b22ddb8bd27d065d3cdca499
>
> when compiled with gcc from opensuse 11.3
> [ 32.579585] cpu_dev_init done
> [ 81.203193] memory_dev_init done
>
> but when compile that with gcc from fedora 14, then will less delay.
> [ 32.404140] cpu_dev_init done
> [ 37.602986] memory_dev_init done
>
> gcc version on opensuse 11.3
> gcc (SUSE Linux) 4.5.0 20100604 [gcc-4_5-branch revision 160292]
>
> gcc version on fedora 14:
> gcc (GCC) 4.5.1 20100924 (Red Hat 4.5.1-4)
Would it be possible to narrow down it a bit which commit causes the boot
slowdown?
known bad : 11c476f31a0f: net,rcu: convert call_rcu(prl_entry_destroy_rcu) to kfree
known good: 0ee5623f9a6e: Linux 2.6.39-rc6
There's 76 commits inbetween so an about 6-step bisection ought to be able to
narrow the source of regression down quite a bit ...
The complication with that bisection will be the need to revert the other
broken commit you found:
e59fb3120bec: rcu: Decrease memory-barrier usage based on semi-formal proof
Which is unfortunately very early in the series, so you'd have to revert this
at almost every step of the bisection ...
Thanks,
Ingo
next prev parent reply other threads:[~2011-05-13 8:43 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-08 15:18 [GIT PULL rcu/next] rcu commits for 2.6.40 Paul E. McKenney
2011-05-09 7:36 ` Ingo Molnar
2011-05-09 21:09 ` Yinghai Lu
2011-05-10 8:56 ` Paul E. McKenney
2011-05-10 9:37 ` Ingo Molnar
2011-05-10 18:04 ` Yinghai Lu
2011-05-10 19:32 ` Paul E. McKenney
2011-05-10 20:52 ` Yinghai Lu
2011-05-11 4:54 ` Paul E. McKenney
2011-05-11 6:03 ` Yinghai Lu
2011-05-11 6:42 ` Yinghai Lu
2011-05-11 20:13 ` Paul E. McKenney
2011-05-11 16:54 ` Yinghai Lu
2011-05-11 16:56 ` Yinghai Lu
2011-05-11 20:18 ` Paul E. McKenney
2011-05-11 20:59 ` Yinghai Lu
2011-05-11 21:30 ` Yinghai Lu
2011-05-11 23:02 ` Yinghai Lu
2011-05-12 6:03 ` Ingo Molnar
2011-05-12 7:27 ` Yinghai Lu
2011-05-12 7:42 ` Yinghai Lu
2011-05-12 9:20 ` Paul E. McKenney
2011-05-12 17:31 ` Yinghai Lu
2011-05-12 21:36 ` Yinghai Lu
2011-05-13 1:28 ` Yinghai Lu
2011-05-13 8:42 ` Ingo Molnar [this message]
2011-05-13 12:19 ` Ingo Molnar
2011-05-13 13:04 ` Ingo Molnar
2011-05-13 13:12 ` Ingo Molnar
2011-05-13 14:14 ` Paul E. McKenney
2011-05-13 15:07 ` Ingo Molnar
2011-05-13 16:26 ` Paul E. McKenney
2011-05-16 7:08 ` Ingo Molnar
2011-05-16 7:48 ` Paul E. McKenney
2011-05-16 11:51 ` Ingo Molnar
2011-05-16 12:23 ` Ingo Molnar
2011-05-16 14:30 ` Ingo Molnar
2011-05-16 21:33 ` Paul E. McKenney
2011-05-16 22:07 ` Paul E. McKenney
2011-05-16 21:24 ` Paul E. McKenney
2011-05-16 23:52 ` Frederic Weisbecker
2011-05-17 2:40 ` Frederic Weisbecker
2011-05-17 7:53 ` Paul E. McKenney
2011-05-17 12:43 ` Frederic Weisbecker
2011-05-17 22:21 ` Paul E. McKenney
2011-05-18 21:10 ` Yinghai Lu
2011-05-18 23:13 ` Frederic Weisbecker
2011-05-19 4:33 ` Yinghai Lu
2011-05-19 14:47 ` Frederic Weisbecker
2011-05-19 19:51 ` Yinghai Lu
2011-05-19 21:15 ` Frederic Weisbecker
2011-05-19 21:45 ` Yinghai Lu
2011-05-20 0:09 ` [PATCH] rcu: Fix unpaired rcu_irq_enter() from locking selftests Frederic Weisbecker
2011-05-20 8:36 ` Ingo Molnar
2011-05-20 15:12 ` Paul E. McKenney
2011-05-20 15:11 ` Paul E. McKenney
2011-05-20 0:14 ` [GIT PULL rcu/next] rcu commits for 2.6.40 Frederic Weisbecker
2011-05-13 14:40 ` Ingo Molnar
2011-05-13 16:38 ` Paul E. McKenney
2011-05-16 7:10 ` Ingo Molnar
2011-05-13 21:08 ` Yinghai Lu
2011-05-14 14:26 ` Paul E. McKenney
2011-05-14 15:31 ` Paul E. McKenney
2011-05-14 18:34 ` Paul E. McKenney
2011-05-15 3:59 ` Yinghai Lu
2011-05-15 4:14 ` Yinghai Lu
2011-05-15 5:41 ` Yinghai Lu
2011-05-15 5:49 ` Yinghai Lu
2011-05-15 6:04 ` Paul E. McKenney
2011-05-15 6:59 ` Paul E. McKenney
2011-05-16 7:08 ` Paul E. McKenney
2011-05-16 7:39 ` Ingo Molnar
2011-05-15 6:01 ` Paul E. McKenney
2011-05-15 22:01 ` Frederic Weisbecker
2011-05-16 5:56 ` Paul E. McKenney
2011-05-16 22:40 ` Frederic Weisbecker
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