From: Peter Zijlstra <peterz@infradead.org>
To: paulmck@linux.vnet.ibm.com
Cc: Avi Kivity <avi@redhat.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Rik van Riel <riel@redhat.com>,
linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
Kent Overstreet <kent.overstreet@gmail.com>,
Ingo Molnar <mingo@elte.hu>
Subject: Re: [COUNTERPATCH] mm: avoid overflowing preempt_count() in mmu_take_all_locks()
Date: Thu, 01 Apr 2010 18:36:14 +0200 [thread overview]
Message-ID: <1270139774.1598.130.camel@laptop> (raw)
In-Reply-To: <20100401161551.GE2472@linux.vnet.ibm.com>
On Thu, 2010-04-01 at 09:15 -0700, Paul E. McKenney wrote:
> > I don't understand. I thought the problem was that the locks were
> > taken inside an rcu critical section; switching to srcu would fix
> > that. But how is call_rcu_preempt() related? Grepping a bit, what
> > is call_rcu_preempt()? my tree doesn't have it.
>
> I believe that Peter is referring to the RCU implementation you get
> with CONFIG_TREE_PREEMPT_RCU, which currently depends on CONFIG_PREEMPT.
> The other implementation is CONFIG_TREE_RCU, which is usually called
> "classic RCU".
Right, so I've been nudging Paul a while to make it so that we always
have preemptible rcu available and that only the default interface
switches between sched/classic and preempt.
Currently we already have:
call_rcu_sched()
call_rcu_bh()
call_rcu() (depends on CONFIG_PREEMPT_RCU)
I'm saying it would be nice to also have:
call_rcu_preempt()
next prev parent reply other threads:[~2010-04-01 16:36 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-30 17:36 [PATCH] increase PREEMPT_BITS to 12 to avoid overflow when starting KVM Rik van Riel
2010-03-30 17:56 ` Peter Zijlstra
2010-03-30 18:05 ` Rik van Riel
2010-03-30 18:34 ` Peter Zijlstra
2010-04-01 9:40 ` [COUNTERPATCH] mm: avoid overflowing preempt_count() in mmu_take_all_locks() Avi Kivity
2010-04-01 10:31 ` Peter Zijlstra
2010-04-01 11:04 ` Thomas Gleixner
2010-04-01 11:13 ` Avi Kivity
2010-04-01 11:16 ` Peter Zijlstra
2010-04-01 11:19 ` Avi Kivity
2010-04-01 15:36 ` Andrea Arcangeli
2010-04-01 15:39 ` Avi Kivity
2010-04-01 15:54 ` Andrea Arcangeli
2010-04-01 16:02 ` Avi Kivity
2010-04-01 16:12 ` Andrea Arcangeli
2010-04-01 11:17 ` Avi Kivity
2010-04-01 11:27 ` Peter Zijlstra
2010-04-01 11:43 ` Peter Zijlstra
2010-04-01 11:47 ` Avi Kivity
2010-04-01 15:42 ` Andrea Arcangeli
2010-04-01 15:50 ` Peter Zijlstra
2010-04-01 15:56 ` Peter Zijlstra
2010-04-01 16:07 ` Andrea Arcangeli
2010-04-01 16:32 ` Peter Zijlstra
2010-04-01 16:00 ` Andrea Arcangeli
2010-04-01 15:51 ` Avi Kivity
2010-04-01 15:56 ` Peter Zijlstra
2010-04-01 16:06 ` Avi Kivity
2010-04-01 16:15 ` Paul E. McKenney
2010-04-01 16:36 ` Peter Zijlstra [this message]
2010-04-01 17:02 ` Paul E. McKenney
2010-04-01 16:08 ` Andrea Arcangeli
2010-04-01 16:14 ` Paul E. McKenney
2010-04-01 16:02 ` Andrea Arcangeli
2010-04-01 16:12 ` Peter Zijlstra
2010-04-01 16:18 ` Andrea Arcangeli
2010-04-01 16:45 ` Peter Zijlstra
2010-04-01 16:49 ` Peter Zijlstra
2010-04-01 17:04 ` Andrea Arcangeli
2010-04-01 14:16 ` Rik van Riel
2010-04-01 15:32 ` Andrea Arcangeli
2010-04-01 15:37 ` Avi Kivity
2010-04-01 11:09 ` Avi Kivity
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