From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vivek Goyal Subject: Re: blkio write controls Date: Mon, 9 Jun 2014 14:29:16 -0400 Message-ID: <20140609182916.GC31499@redhat.com> References: Mime-Version: 1.0 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Content-Disposition: inline In-Reply-To: Sender: cgroups-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="utf-8" To: Travis Thompson Cc: "cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" On Thu, Jun 05, 2014 at 09:31:52PM +0000, Travis Thompson wrote: > Hello, >=20 > I=E2=80=99m currently working on blkio integration for Hadoop YARN an= d I was wondering what the status of write throttling is? My understan= ding right now is it doesn=E2=80=99t work because of buffered writes an= d so the kernel doesn=E2=80=99t know where the io is coming from and do= esn=E2=80=99t throttle it. >=20 Hi Travis, You are right. Throttling for buffered writes still does not work becau= se we have not tracked the original writer who dirtied the pages in page cache. Thanks Vivek