From: Andrea Arcangeli <andrea@qumranet.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: linux-mm@kvack.org, apw@shadowen.org,
Hugh Dickins <hugh@veritas.com>,
holt@sgi.com, steiner@sgi.com
Subject: Re: [patch 5/5] Convert anon_vma spinlock to rw semaphore
Date: Thu, 26 Jun 2008 19:27:15 +0200 [thread overview]
Message-ID: <20080626172715.GJ14329@duo.random> (raw)
In-Reply-To: <Pine.LNX.4.64.0806261019440.7392@schroedinger.engr.sgi.com>
On Thu, Jun 26, 2008 at 10:23:17AM -0700, Christoph Lameter wrote:
> On Thu, 26 Jun 2008, Andrea Arcangeli wrote:
>
> > You dropped the benchmark numbers from the comment, that was useful
> > data. You may want to re-run the benchmark on different hardware just
> > to be sure it was valid though (just to be sure it's a significant
> > regression for AIM).
>
> I could not reproduce it with the recent versions. The degradation was
> less than expected.
That's very encouraging! That info plus the removal of the superflous
atomic ops in the fork fast path sounds quite reasonable. We need to
run this series over some extensive benchmark like the one that found
preemptive BLK was hurting performance a lot to be more certain.
Thanks for the info!
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next prev parent reply other threads:[~2008-06-26 17:27 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-26 0:36 [patch 0/5] [RFC] Conversion of reverse map locks to semaphores Christoph Lameter
2008-06-26 0:36 ` [patch 1/5] Move tlb handling into free_pgtables() Christoph Lameter
2008-06-26 0:36 ` [patch 2/5] Move tlb flushing inside of unmap vmas Christoph Lameter
2008-06-26 0:36 ` [patch 3/5] Add capability to check if rwsems are contended Christoph Lameter
2008-06-26 0:36 ` [patch 4/5] Convert i_mmap_lock to a rw semaphore Christoph Lameter
2008-06-26 0:36 ` [patch 5/5] Convert anon_vma spinlock to " Christoph Lameter
2008-06-26 1:05 ` Andrea Arcangeli
2008-06-26 17:23 ` Christoph Lameter
2008-06-26 17:27 ` Andrea Arcangeli [this message]
2008-06-26 0:53 ` [patch 0/5] [RFC] Conversion of reverse map locks to semaphores Andrea Arcangeli
2008-06-26 17:19 ` Christoph Lameter
2008-06-27 8:53 ` Peter Zijlstra
2008-06-27 15:46 ` Christoph Lameter
2008-06-27 16:38 ` Peter Zijlstra
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