From: Ingo Molnar <mingo@kernel.org>
To: Dave Chinner <david@fromorbit.com>
Cc: Michel Lespinasse <walken@google.com>,
Alex Shi <alex.shi@intel.com>,
David Howells <dhowells@redhat.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Thomas Gleixner <tglx@linutronix.de>,
Yuanhan Liu <yuanhan.liu@linux.intel.com>,
Rik van Riel <riel@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 11/12] rwsem: wake all readers when first waiter is a reader
Date: Mon, 11 Mar 2013 08:50:18 +0100 [thread overview]
Message-ID: <20130311075018.GA10514@gmail.com> (raw)
In-Reply-To: <20130311001650.GB20565@dastard>
* Dave Chinner <david@fromorbit.com> wrote:
> So, that's my concern - we've got 20 years of algorithms in XFS designed
> around rwsem write locks providing read-side barriers, and it's been
> down this road once before (over 15 years ago). [...]
We are certainly not going to break reader/writer fairness - that's a must
for any generic, long-held reader-writer locking mechanism.
Thanks,
Ingo
next prev parent reply other threads:[~2013-03-11 7:50 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-06 23:21 [PATCH 00/12] rwsem fast-path write lock stealing Michel Lespinasse
2013-03-06 23:21 ` [PATCH 01/12] rwsem: make the waiter type an enumeration rather than a bitmask Michel Lespinasse
2013-03-13 21:33 ` Rik van Riel
2013-03-06 23:21 ` [PATCH 02/12] rwsem: shorter spinlocked section in rwsem_down_failed_common() Michel Lespinasse
2013-03-06 23:21 ` [PATCH 03/12] rwsem: move rwsem_down_failed_common code into rwsem_down_{read,write}_failed Michel Lespinasse
2013-03-06 23:21 ` [PATCH 04/12] rwsem: simplify rwsem_down_read_failed Michel Lespinasse
2013-03-06 23:21 ` [PATCH 05/12] rwsem: simplify rwsem_down_write_failed Michel Lespinasse
2013-03-06 23:21 ` [PATCH 06/12] rwsem: more agressive lock stealing in rwsem_down_write_failed Michel Lespinasse
2013-03-06 23:21 ` [PATCH 07/12] rwsem: use cmpxchg for trying to steal write lock Michel Lespinasse
2013-03-06 23:21 ` [PATCH 08/12] rwsem: avoid taking wait_lock in rwsem_down_write_failed Michel Lespinasse
2013-03-06 23:21 ` [PATCH 09/12] rwsem: skip initial trylock " Michel Lespinasse
2013-03-06 23:21 ` [PATCH 10/12] rwsem-spinlock: wake all readers when first waiter is a reader Michel Lespinasse
2013-03-06 23:21 ` [PATCH 11/12] rwsem: " Michel Lespinasse
2013-03-09 0:32 ` Dave Chinner
2013-03-09 1:20 ` Michel Lespinasse
2013-03-11 0:16 ` Dave Chinner
2013-03-11 5:17 ` Michel Lespinasse
2013-03-12 2:36 ` Dave Chinner
2013-03-12 6:43 ` Michel Lespinasse
2013-03-13 3:23 ` Dave Chinner
2013-03-13 11:03 ` Michel Lespinasse
2013-03-14 2:00 ` Peter Hurley
2013-03-19 1:17 ` Dave Chinner
2013-03-19 23:48 ` Michel Lespinasse
2013-03-11 7:50 ` Ingo Molnar [this message]
2013-03-11 20:36 ` Peter Hurley
2013-03-14 7:03 ` Michel Lespinasse
2013-03-14 11:39 ` Peter Hurley
2013-03-14 15:20 ` Michel Lespinasse
2013-03-06 23:21 ` [PATCH 12/12] x86 rwsem: avoid taking slow path when stealing write lock Michel Lespinasse
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