From: Tejun Heo <tj@kernel.org>
To: Christoph Lameter <cl@linux.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>,
Leonard Crestez <lcrestez@ixiacom.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Sorin Dumitru <sdumitru@ixiacom.com>
Subject: Re: [RFC v2] percpu: Add a separate function to merge free areas
Date: Thu, 4 Dec 2014 16:19:12 -0500 [thread overview]
Message-ID: <20141204211912.GG4080@htj.dyndns.org> (raw)
In-Reply-To: <alpine.DEB.2.11.1412041514250.14832@gentwo.org>
On Thu, Dec 04, 2014 at 03:15:27PM -0600, Christoph Lameter wrote:
> On Thu, 4 Dec 2014, Al Viro wrote:
>
> > ... except that somebody has not known that and took refcounts on e.g.
> > vfsmounts into percpu. With massive amounts of hilarity once docker folks
> > started to test the workloads that created/destroyed those in large amounts.
>
> Well, vfsmounts being a performance issue is a bit weird and unexpected.
Docker usage is pretty wide-spread now, making what used to be
siberia-cold paths hot enough to cause actual scalability issues.
Besides, we're now using percpu_ref for things like aio and cgroup
control structures which can be created and destroyed quite
frequently. I don't think we can say these are "weird" use cases
anymore.
Thanks.
--
tejun
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next prev parent reply other threads:[~2014-12-04 21:19 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-02 22:33 Leonard Crestez
2014-12-04 17:57 ` Tejun Heo
2014-12-04 20:10 ` Leonard Crestez
2014-12-04 20:28 ` Christoph Lameter
2014-12-04 20:45 ` Tejun Heo
2014-12-04 20:52 ` Al Viro
2014-12-04 21:15 ` Christoph Lameter
2014-12-04 21:19 ` Tejun Heo [this message]
2014-12-04 21:20 ` Christoph Lameter
2014-12-05 6:25 ` Konstantin Khlebnikov
2014-12-04 20:42 ` Tejun Heo
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