From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Yinghai Lu <yinghai@kernel.org>
Cc: linux-kernel@vger.kernel.org, mingo@redhat.com, hpa@zytor.com,
tglx@linutronix.de, mingo@elte.hu
Subject: Re: [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage based on semi-formal proof"
Date: Tue, 24 May 2011 17:16:08 -0700 [thread overview]
Message-ID: <20110525001608.GA21060@linux.vnet.ibm.com> (raw)
In-Reply-To: <20110525000530.GK2266@linux.vnet.ibm.com>
On Tue, May 24, 2011 at 05:05:30PM -0700, Paul E. McKenney wrote:
> On Tue, May 24, 2011 at 02:23:45PM -0700, Yinghai Lu wrote:
> > On 05/23/2011 06:35 PM, Paul E. McKenney wrote:
[ . . . ]
> > after:
> > commit bcd6e68330f893a81b3519ab3c5fc2bebbc9988c
> > Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
> > Date: Tue Sep 7 10:38:22 2010 -0700
> >
> > rcu: Decrease memory-barrier usage based on semi-formal proof
> > ...
> >
> > got:
> >
> > [ 32.447936] cpu_dev_init done
> > [ 111.027066] memory_dev_init done
>
> So there is something nasty in this patch.
>
> Not seeing it immediately, but it does give me some focus for both
> code inspection and possible diagnostic patches.
Actually, I already do have some debugfs stuff that should help me spot
the problem.
So could you please build both with and without this commit enabling
CONFIG_TRACE_RCU and send me the contents of the debugfs files rcu/rcuhier
and rcu/rcudata in both cases?
This will show me the results of the full boot path. If this turns out to
drown out the differences, I will create a more focused diagnostic patch.
Thanx, Paul
next prev parent reply other threads:[~2011-05-25 0:16 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <tip-80d02085d99039b3b7f3a73c8896226b0cb1ba07@git.kernel.org>
2011-05-20 21:04 ` [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage based on semi-formal proof" Yinghai Lu
2011-05-20 22:42 ` Paul E. McKenney
2011-05-20 23:09 ` Yinghai Lu
2011-05-20 23:14 ` Paul E. McKenney
2011-05-20 23:16 ` Yinghai Lu
2011-05-20 23:49 ` Paul E. McKenney
2011-05-21 0:02 ` Yinghai Lu
2011-05-21 13:18 ` Paul E. McKenney
2011-05-21 14:08 ` Paul E. McKenney
2011-05-23 20:14 ` Yinghai Lu
2011-05-23 21:25 ` Paul E. McKenney
2011-05-23 22:01 ` Yinghai Lu
2011-05-23 22:55 ` Yinghai Lu
2011-05-23 22:58 ` Yinghai Lu
2011-05-24 1:18 ` Paul E. McKenney
2011-05-24 1:26 ` Yinghai Lu
2011-05-24 1:35 ` Paul E. McKenney
2011-05-24 21:23 ` Yinghai Lu
2011-05-25 0:05 ` Paul E. McKenney
2011-05-25 0:13 ` Yinghai Lu
2011-05-25 4:46 ` Paul E. McKenney
2011-05-25 7:24 ` Ingo Molnar
2011-05-25 20:48 ` Paul E. McKenney
2011-05-25 7:18 ` Ingo Molnar
2011-05-25 0:16 ` Paul E. McKenney [this message]
2011-05-25 0:10 ` Yinghai Lu
2011-05-25 4:52 ` Paul E. McKenney
2011-05-25 7:27 ` Ingo Molnar
2011-05-25 20:47 ` Paul E. McKenney
2011-05-25 20:52 ` Ingo Molnar
2011-05-25 22:15 ` Yinghai Lu
2011-05-25 22:34 ` Paul E. McKenney
2011-05-25 22:49 ` Yinghai Lu
2011-05-26 1:13 ` Paul E. McKenney
2011-05-26 1:30 ` Paul E. McKenney
2011-05-26 6:13 ` Ingo Molnar
2011-05-26 14:25 ` Paul E. McKenney
2011-05-26 17:43 ` Paul E. McKenney
2011-05-26 20:26 ` Ingo Molnar
2011-05-26 15:08 ` Yinghai Lu
2011-05-26 16:28 ` Paul E. McKenney
2011-05-28 1:04 ` Paul E. McKenney
2011-05-28 4:03 ` Yinghai Lu
2011-05-28 6:38 ` Paul E. McKenney
2011-05-24 1:12 ` Paul E. McKenney
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20110525001608.GA21060@linux.vnet.ibm.com \
--to=paulmck@linux.vnet.ibm.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=mingo@redhat.com \
--cc=tglx@linutronix.de \
--cc=yinghai@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.