From: Rusty Russell <rusty@rustcorp.com.au>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Eric Dumazet <dada1@cosmosbay.com>,
Andrew Morton <akpm@linux-foundation.org>,
Theodore Tso <tytso@mit.edu>,
linux kernel <linux-kernel@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Mingming Cao <cmm@us.ibm.com>,
linux-ext4@vger.kernel.org,
Christoph Lameter <cl@linux-foundation.org>
Subject: Re: [PATCH] percpu_counter: use local_t and atomic_long_t if possible
Date: Thu, 25 Dec 2008 23:56:58 +1030 [thread overview]
Message-ID: <200812252356.59595.rusty@rustcorp.com.au> (raw)
In-Reply-To: <1230032601.9487.247.camel@twins>
On Tuesday 23 December 2008 22:13:21 Peter Zijlstra wrote:
> One think that sprung to mind,..
>
> IFF we're going to implement percpu_counter with local_t and make
> local_t this funny tri-counter thing which has its own error, you need
> to fix up bdi_stat_error() - it expects to be an upper bound for the
> counter error, getting that wrong _will_ cause deadlocks.
It's OK: local_add_return() can't have error; that's why the trival
implementation disables interrupts around it.
Hope that helps,
Rusty.
next prev parent reply other threads:[~2008-12-25 13:27 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-03 18:40 [PATCH] percpu_counter: fix CPU unplug race in percpu_counter_destroy() Eric Dumazet
2008-12-03 20:24 ` [PATCH] percpu_counter: Fix __percpu_counter_sum() Eric Dumazet
2008-12-03 20:45 ` Peter Zijlstra
2008-12-04 6:14 ` David Miller
2008-12-07 4:22 ` Andrew Morton
2008-12-07 4:22 ` Andrew Morton
2008-12-07 10:25 ` Peter Zijlstra
2008-12-07 13:28 ` Eric Dumazet
2008-12-07 13:28 ` Eric Dumazet
2008-12-07 17:28 ` Andrew Morton
2008-12-07 18:00 ` Eric Dumazet
2008-12-07 18:00 ` Eric Dumazet
2008-12-08 4:52 ` Andrew Morton
2008-12-08 22:12 ` Theodore Tso
2008-12-08 22:20 ` Peter Zijlstra
2008-12-08 23:00 ` Theodore Tso
2008-12-08 23:05 ` Peter Zijlstra
2008-12-08 23:08 ` Peter Zijlstra
2008-12-09 8:12 ` Eric Dumazet
2008-12-09 8:12 ` Eric Dumazet
2008-12-09 8:34 ` Peter Zijlstra
2008-12-09 8:34 ` Peter Zijlstra
2008-12-10 5:09 ` Eric Dumazet
2008-12-10 5:49 ` Andrew Morton
2008-12-10 22:56 ` Eric Dumazet
2008-12-10 22:56 ` Eric Dumazet
2008-12-12 8:17 ` Rusty Russell
2008-12-12 8:22 ` Eric Dumazet
2008-12-12 8:22 ` Eric Dumazet
2008-12-12 11:08 ` [PATCH] percpu_counter: use local_t and atomic_long_t if possible Eric Dumazet
2008-12-12 11:08 ` Eric Dumazet
2008-12-12 11:29 ` Peter Zijlstra
2008-12-23 11:43 ` Peter Zijlstra
2008-12-25 13:26 ` Rusty Russell [this message]
2008-12-15 12:53 ` [PATCH] percpu_counter: Fix __percpu_counter_sum() Rusty Russell
2008-12-16 20:16 ` Ingo Molnar
2008-12-10 7:12 ` Peter Zijlstra
2008-12-08 23:07 ` Andrew Morton
2008-12-08 23:49 ` Theodore Tso
2008-12-08 22:22 ` Andrew Morton
2008-12-08 22:44 ` Mingming Cao
2008-12-08 22:44 ` Mingming Cao
2008-12-07 22:24 ` [PATCH] atomic: fix a typo in atomic_long_xchg() Eric Dumazet
2008-12-07 22:24 ` Eric Dumazet
2008-12-07 15:28 ` [PATCH] percpu_counter: Fix __percpu_counter_sum() Theodore Tso
2008-12-08 4:42 ` Andrew Morton
2008-12-08 17:55 ` Mingming Cao
2008-12-08 17:55 ` Mingming Cao
2008-12-11 16:32 ` [stable] " Greg KH
2008-12-08 17:44 ` Mingming Cao
2008-12-08 17:44 ` Mingming Cao
2008-12-04 6:13 ` [PATCH] percpu_counter: fix CPU unplug race in percpu_counter_destroy() David Miller
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