From: Srivatsa Vaddagiri <vatsa@in.ibm.com>
To: "Paul E. McKenney" <paulmck@us.ibm.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>,
linux-kernel@vger.kernel.org,
Dipankar Sarma <dipankar@in.ibm.com>,
Manfred Spraul <manfred@colorfullife.com>,
Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH 2/5] rcu: don't check ->donelist in __rcu_pending()
Date: Tue, 10 Jan 2006 15:28:11 +0530 [thread overview]
Message-ID: <20060110095811.GA30159@in.ibm.com> (raw)
In-Reply-To: <20060109195933.GE14738@us.ibm.com>
On Mon, Jan 09, 2006 at 11:59:33AM -0800, Paul E. McKenney wrote:
> Hmmm... So your thought is that __rcu_offline_cpu() moves nxtlist and
> curlist, but not donelist, but then returns to rcu_offline_cpu(), which
> might well do the tasklet_kill_immediate() before the tasklet completed
> processing all of donelist.
>
> Seems plausible to me. If true, your patch adding the following statement
> to the ed of __rcu_offline_cpu seems like a reasonable fix:
>
> rcu_move_batch(this_rdp, rdp->donelist, rdp->donetail);
>
> Vatsa, is there something that Oleg and I are missing?
I think this should take care of the CPU Hotplug bug, with the caveat
that the callbacks on ->donelist will wait for additional grace period before
being invoked (which seems ok).
Oleg, do you want to resend the patch after some testing?
- vatsa
next prev parent reply other threads:[~2006-01-10 9:58 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-08 19:19 [PATCH 2/5] rcu: don't check ->donelist in __rcu_pending() Oleg Nesterov
2006-01-08 22:00 ` Paul E. McKenney
2006-01-09 9:31 ` Srivatsa Vaddagiri
2006-01-09 14:51 ` Oleg Nesterov
2006-01-09 13:42 ` Srivatsa Vaddagiri
2006-01-09 15:33 ` Oleg Nesterov
2006-01-09 18:59 ` Paul E. McKenney
2006-01-09 20:31 ` Oleg Nesterov
2006-01-09 19:59 ` Paul E. McKenney
2006-01-10 9:58 ` Srivatsa Vaddagiri [this message]
2006-01-10 14:24 ` [PATCH] rcu: fix hotplug-cpu ->donelist leak Oleg Nesterov
2006-01-11 5:01 ` Paul E. McKenney
2006-01-11 16:28 ` Paul E. McKenney
2006-01-11 19:25 ` Oleg Nesterov
2006-01-11 18:21 ` Paul E. McKenney
2006-01-10 14:27 ` [PATCH 2/5] rcu: don't check ->donelist in __rcu_pending() Oleg Nesterov
2006-01-10 18:13 ` Dipankar Sarma
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