From: Peter Zijlstra <peterz@infradead.org>
To: Rik van Riel <riel@redhat.com>
Cc: linux-kernel@vger.kernel.org, avi@redhat.com,
aarcange@redhat.com, akpm@linux-foundation.org,
Kent Overstreet <kent.overstreet@gmail.com>,
Ingo Molnar <mingo@elte.hu>, tglx <tglx@linutronix.de>
Subject: Re: [PATCH] increase PREEMPT_BITS to 12 to avoid overflow when starting KVM
Date: Tue, 30 Mar 2010 20:34:49 +0200 [thread overview]
Message-ID: <1269974089.5258.565.camel@laptop> (raw)
In-Reply-To: <4BB23D64.70502@redhat.com>
On Tue, 2010-03-30 at 14:05 -0400, Rik van Riel wrote:
> > Also, you'll need to convince mingo and tglx too.. taking that many
> > spinlocks is utter suckage..
>
> No argument there. I can't think of an alternative to mm_take_all_locks
> though. Andrea?
Well there's altneratives enough, back when this got introduces quite a
few got mentioned too, but they all make the !mm_take_all_locks() lock
side slower so Andrea didn't like them.
I think one of them got mentioned in yesterday's thread as well.
Another alternative is making all those spinlocks mutexes, that will get
rid of that massive !preempt section too.
next prev parent reply other threads:[~2010-03-30 18:34 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 [this message]
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
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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