From: Andrew Morton <akpm@linux-foundation.org>
To: root@programming.kicks-ass.net
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
miklos@szeredi.hu, neilb@suse.de, dgc@sgi.com,
tomoki.sekiyama.qu@hitachi.com, a.p.zijlstra@chello.nl,
nikita@clusterfs.com
Subject: Re: [PATCH 08/12] mm: fixup possible deadlock
Date: Thu, 5 Apr 2007 15:43:50 -0700 [thread overview]
Message-ID: <20070405154350.0ea203ea.akpm@linux-foundation.org> (raw)
In-Reply-To: <20070405174319.617238739@programming.kicks-ass.net>
On Thu, 05 Apr 2007 19:42:17 +0200
root@programming.kicks-ass.net wrote:
> When the threshol is in the order of the per cpu inaccuracies we can
> deadlock by not receiveing the updated count,
That explanation is a bit, umm, terse.
> introduce a more expensive
> but more accurate stat read function to use on low thresholds.
Looks like percpu_counter_sum().
WARNING: multiple messages have this Message-ID (diff)
From: Andrew Morton <akpm@linux-foundation.org>
To: root@programming.kicks-ass.net
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
miklos@szeredi.hu, neilb@suse.de, dgc@sgi.com,
tomoki.sekiyama.qu@hitachi.com, a.p.zijlstra@chello.nl,
nikita@clusterfs.com
Subject: Re: [PATCH 08/12] mm: fixup possible deadlock
Date: Thu, 5 Apr 2007 15:43:50 -0700 [thread overview]
Message-ID: <20070405154350.0ea203ea.akpm@linux-foundation.org> (raw)
In-Reply-To: <20070405174319.617238739@programming.kicks-ass.net>
On Thu, 05 Apr 2007 19:42:17 +0200
root@programming.kicks-ass.net wrote:
> When the threshol is in the order of the per cpu inaccuracies we can
> deadlock by not receiveing the updated count,
That explanation is a bit, umm, terse.
> introduce a more expensive
> but more accurate stat read function to use on low thresholds.
Looks like percpu_counter_sum().
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next prev parent reply other threads:[~2007-04-05 22:44 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-05 17:42 [PATCH 00/12] per device dirty throttling -v3 root
2007-04-05 17:42 ` root
2007-04-05 17:42 ` [PATCH 01/12] nfs: remove congestion_end() root
2007-04-05 17:42 ` root
2007-04-05 17:42 ` [PATCH 02/12] mm: scalable bdi statistics counters root
2007-04-05 17:42 ` root
2007-04-05 22:37 ` Andrew Morton
2007-04-05 22:37 ` Andrew Morton
2007-04-06 7:22 ` Peter Zijlstra
2007-04-06 7:22 ` Peter Zijlstra
2007-04-05 17:42 ` [PATCH 03/12] mm: count dirty pages per BDI root
2007-04-05 17:42 ` root
2007-04-05 17:42 ` [PATCH 04/12] mm: count writeback " root
2007-04-05 17:42 ` root
2007-04-05 17:42 ` [PATCH 05/12] mm: count unstable " root
2007-04-05 17:42 ` root
2007-04-05 17:42 ` [PATCH 06/12] mm: expose BDI statistics in sysfs root
2007-04-05 17:42 ` root
2007-04-05 17:42 ` [PATCH 07/12] mm: per device dirty threshold root
2007-04-05 17:42 ` root
2007-04-05 17:42 ` [PATCH 08/12] mm: fixup possible deadlock root
2007-04-05 17:42 ` root
2007-04-05 22:43 ` Andrew Morton [this message]
2007-04-05 22:43 ` Andrew Morton
2007-04-05 17:42 ` [PATCH 09/12] mm: remove throttle_vm_writeback root
2007-04-05 17:42 ` root
2007-04-05 22:44 ` Andrew Morton
2007-04-05 22:44 ` Andrew Morton
2007-09-26 20:42 ` Peter Zijlstra
2007-09-26 20:42 ` Peter Zijlstra
2007-04-05 17:42 ` [PATCH 10/12] mm: page_alloc_wait root
2007-04-05 17:42 ` root
2007-04-05 22:57 ` Andrew Morton
2007-04-05 22:57 ` Andrew Morton
2007-04-06 6:37 ` Peter Zijlstra
2007-04-06 6:37 ` Peter Zijlstra
2007-04-05 17:42 ` [PATCH 11/12] mm: accurate pageout congestion wait root
2007-04-05 17:42 ` root
2007-04-05 23:17 ` Andrew Morton
2007-04-05 23:17 ` Andrew Morton
2007-04-06 6:51 ` Peter Zijlstra
2007-04-06 6:51 ` Peter Zijlstra
2007-04-05 17:42 ` [PATCH 12/12] mm: per BDI congestion feedback root
2007-04-05 17:42 ` root
2007-04-05 23:24 ` Andrew Morton
2007-04-05 23:24 ` Andrew Morton
2007-04-06 7:01 ` Peter Zijlstra
2007-04-06 7:01 ` Peter Zijlstra
2007-04-06 11:00 ` Andrew Morton
2007-04-06 11:00 ` Andrew Morton
2007-04-06 11:10 ` Miklos Szeredi
2007-04-06 11:10 ` Miklos Szeredi
2007-04-05 17:47 ` [PATCH 00/12] per device dirty throttling -v3 Peter Zijlstra
2007-04-05 17:47 ` Peter Zijlstra
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