From: Tejun Heo <tj@kernel.org>
To: shaohua.li@intel.com
Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
cl@linux.com, eric.dumazet@gmail.com
Subject: Re: [patch v2 4/4] percpu_counter: use atomic64 for counter
Date: Thu, 14 Apr 2011 04:07:47 +0900 [thread overview]
Message-ID: <20110413190747.GE3987@mtj.dyndns.org> (raw)
In-Reply-To: <20110413080517.901701497@sli10-conroe.sh.intel.com>
On Wed, Apr 13, 2011 at 03:57:19PM +0800, shaohua.li@intel.com wrote:
> This can improve some workloads with percpu_counter->lock heavily contented.
> For example, vm_committed_as sometimes causes the contention. We should tune
> the batch count, but if we can make percpu_counter better, why not? In a 24
> CPUs system, 24 processes run stress mmap()/mmunmap(), the atomic method
> gives 50x faster.
Christoph already raised the issue but I'd also love to know a bit
more detail on the test than "50x faster".
Thanks.
--
tejun
next prev parent reply other threads:[~2011-04-13 19:07 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-13 7:57 [patch v2 0/4] percpu_counter: cleanup and fix shaohua.li
2011-04-13 7:57 ` [patch v2 1/4] percpu_counter: change return value and add comments shaohua.li
2011-04-13 19:05 ` Tejun Heo
2011-04-13 7:57 ` [patch v2 2/4] percpu_counter: delete dead code shaohua.li
2011-04-13 18:59 ` Tejun Heo
2011-04-18 0:12 ` Ted Ts'o
2011-04-13 7:57 ` [patch v2 3/4] percpu_counter: fix code for 32bit systems shaohua.li
2011-04-13 19:04 ` Tejun Heo
2011-04-13 7:57 ` [patch v2 4/4] percpu_counter: use atomic64 for counter shaohua.li
2011-04-13 19:07 ` Tejun Heo [this message]
2011-04-13 14:08 ` [patch v2 0/4] percpu_counter: cleanup and fix Christoph Lameter
2011-04-14 1:04 ` Shaohua Li
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