From: Andrea Arcangeli <andrea@qumranet.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: steiner@sgi.com, Peter Zijlstra <a.p.zijlstra@chello.nl>,
linux-mm@kvack.org, Kanoj Sarcar <kanojsarcar@yahoo.com>,
Roland Dreier <rdreier@cisco.com>,
Steve Wise <swise@opengridcomputing.com>,
linux-kernel@vger.kernel.org, Avi Kivity <avi@qumranet.com>,
kvm-devel@lists.sourceforge.net, daniel.blueman@quadrics.com,
Robin Holt <holt@sgi.com>,
general@lists.openfabrics.org, Hugh Dickins <hugh@veritas.com>
Subject: Re: [patch 5/9] Convert anon_vma lock to rw_sem and refcount
Date: Wed, 2 Apr 2008 19:50:58 +0200 [thread overview]
Message-ID: <20080402175058.GR19189@duo.random> (raw)
In-Reply-To: <20080401205636.777127252@sgi.com>
On Tue, Apr 01, 2008 at 01:55:36PM -0700, Christoph Lameter wrote:
> This results in f.e. the Aim9 brk performance test to got down by 10-15%.
I guess it's more likely because of overscheduling for small crtitical
sections, did you counted the total number of context switches? I
guess there will be a lot more with your patch applied. That
regression is a showstopper and it is the reason why I've suggested
before to add a CONFIG_XPMEM or CONFIG_MMU_NOTIFIER_SLEEP config
option to make the VM locks sleep capable only when XPMEM=y
(PREEMPT_RT will enable it too). Thanks for doing the benchmark work!
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next prev parent reply other threads:[~2008-04-02 17:50 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-01 20:55 [ofa-general] [patch 0/9] [RFC] EMM Notifier V2 Christoph Lameter
2008-04-01 20:55 ` [patch 1/9] EMM Notifier: The notifier calls Christoph Lameter
2008-04-02 6:49 ` [ofa-general] " Andrea Arcangeli
2008-04-02 10:59 ` Robin Holt
2008-04-02 11:16 ` Andrea Arcangeli
2008-04-02 14:26 ` Robin Holt
2008-04-02 17:59 ` [ofa-general] " Christoph Lameter
2008-04-02 19:03 ` [ofa-general] EMM: Fixup return value handling of emm_notify() Christoph Lameter
2008-04-02 21:25 ` [ofa-general] " Andrea Arcangeli
2008-04-02 21:33 ` Christoph Lameter
2008-04-03 10:40 ` Peter Zijlstra
2008-04-03 15:00 ` Andrea Arcangeli
2008-04-03 19:14 ` Christoph Lameter
2008-04-02 21:05 ` [ofa-general] EMM: Require single threadedness for registration Christoph Lameter
2008-04-02 22:01 ` [ofa-general] " Andrea Arcangeli
2008-04-02 22:06 ` Christoph Lameter
2008-04-02 22:17 ` Andrea Arcangeli
2008-04-02 22:41 ` Christoph Lameter
2008-04-03 1:24 ` EMM: disable other notifiers before register and unregister Christoph Lameter
2008-04-03 10:40 ` [ofa-general] " Peter Zijlstra
2008-04-03 15:29 ` Andrea Arcangeli
2008-04-03 19:20 ` [ofa-general] " Christoph Lameter
2008-04-03 20:23 ` Christoph Lameter
2008-04-04 12:30 ` Andrea Arcangeli
2008-04-04 20:20 ` [ofa-general] [PATCH] mmu notifier #v11 Andrea Arcangeli
2008-04-04 22:06 ` Christoph Lameter
2008-04-05 0:23 ` [ofa-general] " Andrea Arcangeli
2008-04-07 5:45 ` Christoph Lameter
2008-04-07 6:02 ` [ofa-general] " Andrea Arcangeli
2008-04-02 21:53 ` [ofa-general] Re: [patch 1/9] EMM Notifier: The notifier calls Andrea Arcangeli
2008-04-02 21:54 ` Christoph Lameter
2008-04-02 22:09 ` Andrea Arcangeli
2008-04-02 23:04 ` Christoph Lameter
2008-04-01 20:55 ` [ofa-general] [patch 2/9] Move tlb flushing into free_pgtables Christoph Lameter
2008-04-01 20:55 ` [ofa-general] [patch 3/9] Convert i_mmap_lock to i_mmap_sem Christoph Lameter
2008-04-01 20:55 ` [patch 4/9] Remove tlb pointer from the parameters of unmap vmas Christoph Lameter
2008-04-01 20:55 ` [patch 5/9] Convert anon_vma lock to rw_sem and refcount Christoph Lameter
2008-04-02 17:50 ` Andrea Arcangeli [this message]
2008-04-02 18:15 ` Christoph Lameter
2008-04-02 21:56 ` [ofa-general] " Andrea Arcangeli
2008-04-02 21:56 ` Christoph Lameter
2008-04-02 22:12 ` Andrea Arcangeli
2008-04-01 20:55 ` [patch 6/9] This patch exports zap_page_range as it is needed by XPMEM Christoph Lameter
2008-04-01 20:55 ` [patch 7/9] Locking rules for taking multiple mmap_sem locks Christoph Lameter
2008-04-01 20:55 ` [patch 8/9] XPMEM: The device driver Christoph Lameter
2008-04-01 20:55 ` [patch 9/9] XPMEM: Simple example Christoph Lameter
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