From: Sasha Levin <sasha.levin@oracle.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>,
linux-next list <linux-next@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
paulmck@linux.vnet.ibm.com, avi@redhat.com, fweisbec@gmail.com
Subject: Re: [RFC PATCH] Fix abnormal rcu dynticks_nesting values related to async page fault
Date: Tue, 27 Nov 2012 09:01:33 -0500 [thread overview]
Message-ID: <50B4C7BD.90807@oracle.com> (raw)
In-Reply-To: <20121127130703.GW25516@redhat.com>
On 11/27/2012 08:07 AM, Gleb Natapov wrote:
> Those rcu_irq_enter()/rcu_irq_exit() were introduced by commit
> c5e015d4949aa665 "KVM guest: exit idleness when handling
> KVM_PV_REASON_PAGE_NOT_PRESENT", but now I am starting to question this
> commit. KVM_PV_REASON_PAGE_NOT_PRESENT should not kick cpu out of
> idleness. kvm_async_pf_task_wait() checks that cpu is idle and calls
> halt if it is. After that commit schedule() may be called between
> rcu_irq_enter()/rcu_irq_exit() which is probably illegal. Paul?
otoh, calling schedule() apparently kicks cpu out of idleness now.
Thanks,
Sasha
next prev parent reply other threads:[~2012-11-27 14:02 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-27 5:15 [RFC PATCH] Fix abnormal rcu dynticks_nesting values related to async page fault Li Zhong
2012-11-27 5:58 ` [PATCH rcu] use new nesting value for rcu_dyntick trace in rcu_eqs_enter_common Li Zhong
2012-11-27 15:18 ` Paul E. McKenney
2012-11-27 13:07 ` [RFC PATCH] Fix abnormal rcu dynticks_nesting values related to async page fault Gleb Natapov
2012-11-27 14:01 ` Sasha Levin [this message]
2012-11-27 15:25 ` Paul E. McKenney
2012-11-27 15:34 ` Frederic Weisbecker
2012-11-27 14:38 ` Frederic Weisbecker
2012-11-27 15:44 ` Gleb Natapov
2012-11-27 15:56 ` Frederic Weisbecker
2012-11-27 16:19 ` Paul E. McKenney
2012-11-27 16:48 ` Frederic Weisbecker
2012-11-27 16:59 ` Paul E. McKenney
2012-11-27 16:39 ` Gleb Natapov
2012-11-27 16:51 ` Frederic Weisbecker
2012-11-27 17:00 ` Gleb Natapov
2012-11-27 17:30 ` Frederic Weisbecker
2012-11-27 17:47 ` Gleb Natapov
2012-11-27 18:12 ` Frederic Weisbecker
2012-11-27 19:27 ` Gleb Natapov
2012-11-27 22:53 ` Frederic Weisbecker
2012-11-27 22:54 ` Frederic Weisbecker
2012-11-27 15:39 ` Frederic Weisbecker
2012-11-27 16:16 ` Paul E. McKenney
2012-11-27 16:31 ` Frederic Weisbecker
2012-11-27 16:29 ` Frederic Weisbecker
2012-11-28 8:18 ` [RFC PATCH v2] Add rcu user eqs exception hooks for " Li Zhong
2012-11-28 12:55 ` Frederic Weisbecker
2012-11-28 13:53 ` Gleb Natapov
2012-11-28 14:25 ` Frederic Weisbecker
2012-11-29 11:07 ` Gleb Natapov
2012-11-29 14:47 ` Frederic Weisbecker
2012-11-30 9:18 ` [RFC PATCH v3] " Li Zhong
2012-11-30 10:26 ` Gleb Natapov
2012-12-03 2:08 ` Li Zhong
2012-12-03 8:30 ` Gleb Natapov
2012-12-03 9:57 ` Gleb Natapov
2012-12-04 2:35 ` [ PATCH] " Li Zhong
2012-12-18 13:25 ` Gleb Natapov
2012-12-04 2:36 ` [RFC PATCH v3] " Li Zhong
2012-12-04 5:11 ` Gleb Natapov
2012-12-04 5:40 ` Li Zhong
2012-12-04 13:02 ` Gleb Natapov
2012-12-04 14:28 ` Paul E. McKenney
2012-11-29 1:49 ` [RFC PATCH v2] " Li Zhong
2012-11-29 14:40 ` Frederic Weisbecker
2012-11-29 17:25 ` Gleb Natapov
2012-11-30 8:36 ` Li Zhong
2012-11-30 10:08 ` Gleb Natapov
2012-11-27 16:43 ` [RFC PATCH] Fix abnormal rcu dynticks_nesting values related to " Frederic Weisbecker
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