From: Tim Chen <tim.c.chen@linux.intel.com>
To: Christoph Lameter <cl@linux.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Tejun Heo <tj@kernel.org>, Al Viro <viro@zeniv.linux.org.uk>,
Dave Hansen <dave.hansen@intel.com>,
Andi Kleen <ak@linux.intel.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>
Subject: Re: [PATCH 1/2] Make the batch size of the percpu_counter configurable
Date: Tue, 30 Apr 2013 10:55:22 -0700 [thread overview]
Message-ID: <1367344522.27102.184.camel@schen9-DESK> (raw)
In-Reply-To: <0000013e5c1377c5-49a8fca5-eb04-4e3a-a507-ce3a47fea685-000000@email.amazonses.com>
On Tue, 2013-04-30 at 17:53 +0000, Christoph Lameter wrote:
> On Tue, 30 Apr 2013, Tim Chen wrote:
>
> > > And why is it a pointer?
> >
> > A pointer because the default percpu_counter_batch value could change
> > later when cpus come online after we initialize per cpu counter and
> > percpu_counter_batch will get computed again in percpu_counter_startup.
> > Making it a pointer will make it unnecessary to come back and change the
> > batch sizes if we use static batch value and default batch size.
>
> But you will have to dereference the pointer whenever you want the batch
> size from the hot path. Looks like it would be better to put the value
> there directly. You have a list of percpu counters that can be traversed
> to change the batch size.
>
I have considered that. But the list is not available unless we have
CONFIG_HOTPLUG_CPU compiled in.
Tim
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next prev parent reply other threads:[~2013-04-30 17:55 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-29 17:12 Tim Chen
2013-04-29 17:12 ` [PATCH 2/2] Make batch size for memory accounting configured according to size of memory Tim Chen
2013-05-01 5:09 ` Ric Mason
2013-05-01 16:07 ` Tim Chen
2013-04-30 13:32 ` [PATCH 1/2] Make the batch size of the percpu_counter configurable Christoph Lameter
2013-04-30 16:23 ` Tim Chen
2013-04-30 17:28 ` Christoph Lameter
2013-04-30 17:48 ` Tim Chen
2013-04-30 17:53 ` Christoph Lameter
2013-04-30 17:55 ` Tim Chen [this message]
2013-04-30 18:27 ` Christoph Lameter
2013-04-30 19:00 ` Tim Chen
2013-04-30 19:04 ` Tejun Heo
2013-04-30 20:50 ` Christoph Lameter
2013-04-30 17:34 ` Andi Kleen
2013-04-30 18:10 ` Eric Dumazet
2013-04-30 18:28 ` Tim Chen
2013-05-01 4:52 ` Simon Jeons
2013-05-01 15:53 ` Tim Chen
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