From: Andrea Arcangeli <aarcange@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Avi Kivity <avi@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>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: Re: [COUNTERPATCH] mm: avoid overflowing preempt_count() in mmu_take_all_locks()
Date: Thu, 1 Apr 2010 18:08:51 +0200 [thread overview]
Message-ID: <20100401160851.GV5825@random.random> (raw)
In-Reply-To: <1270137406.1598.78.camel@laptop>
On Thu, Apr 01, 2010 at 05:56:46PM +0200, Peter Zijlstra wrote:
> I would much rather we make call_rcu_preempt() available at all times.
srcu is needed only for XPMEM to make the mmu notifier handlers
sleepable. Ignore it for now, it can be done later. The locks you're
changing are always taken _before_ the mmu notifier_range_start and
always after the mmu_notifier_range_end, so srcu can be done later...
It's orthogonal issue, but the moment these locks are sleepable it
simply worth to switch mmu notifiers to srcu to accommodate XPMEM.
next prev parent reply other threads:[~2010-04-01 16:40 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
2010-04-01 17:02 ` Paul E. McKenney
2010-04-01 16:08 ` Andrea Arcangeli [this message]
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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