From: William Lee Irwin III <wli@holomorphy.com>
To: Manfred Spraul <manfred@colorfullife.com>
Cc: linux-kernel@vger.kernel.org, Keith Owens <kaos@ocs.com.au>
Subject: Re: [RFC] Lock free fd lookup
Date: Sat, 17 Jul 2004 02:30:17 -0700 [thread overview]
Message-ID: <20040717093017.GN3411@holomorphy.com> (raw)
In-Reply-To: <40F8E868.7000008@colorfullife.com>
At some point in the past, Keith Owens wrote:
>>> It requires type stable storage. That is, once a data area has been
>>> allocated to a particular structure type, it always contains that
>>> structure type, even when it has been freed from the list. Each list
>>> requires its own free pool, which can never be returned to the OS.
wli wrote
>>The last of these is particularly lethal.
On Sat, Jul 17, 2004 at 10:50:48AM +0200, Manfred Spraul wrote:
> It might be possible to combine such a lock free algorithms with RCU and
> then set Hugh's SLAB_DESTROY_BY_RCU: It inserts a call_rcu between
> leaving the free pool and returning the page to the OS.
At least I would prefer such a hybrid algorithm if things of this kind
were used in the kernel. From the looks of it, in such algorithms the
structure is still valid for checking of tickets after a voluntary
preemption, in this RCU hybrid not.
-- wli
next prev parent reply other threads:[~2004-07-17 9:30 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-17 8:50 [RFC] Lock free fd lookup Manfred Spraul
2004-07-17 9:30 ` William Lee Irwin III [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-07-17 19:17 Albert Cahalan
2004-07-29 0:14 ` William Lee Irwin III
2004-07-14 4:53 [RFC] Refcounting of objects part of a lockfree collection Ravikiran G Thirumalai
2004-07-14 4:56 ` [RFC] Lock free fd lookup Ravikiran G Thirumalai
2004-07-14 15:17 ` Chris Wright
2004-07-15 14:22 ` Jesse Barnes
2004-07-15 16:10 ` Dipankar Sarma
2004-07-15 16:22 ` Jesse Barnes
2004-07-15 16:34 ` Chris Wright
2004-07-16 5:38 ` Ravikiran G Thirumalai
2004-07-16 6:27 ` William Lee Irwin III
2004-07-17 0:55 ` Keith Owens
2004-07-17 1:19 ` William Lee Irwin III
2004-07-17 2:12 ` Keith Owens
2004-07-17 2:34 ` William Lee Irwin III
2004-07-17 2:28 ` Keith Owens
2004-07-17 3:16 ` William Lee Irwin III
2004-07-17 13:48 ` Peter Zijlstra
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