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Date: Wed, 16 Feb 2011 13:06:28 -0500 From: Vivek Goyal <vgoyal@...hat.com> To: Divyesh Shah <dpshah@...gle.com> Cc: Gui Jianfeng <guijianfeng@...fujitsu.com>, Jens Axboe <axboe@...nel.dk>, Shaohua Li <shaohua.li@...el.com>, lkml <linux-kernel@...r.kernel.org>, Chad Talbott <ctalbott@...gle.com> Subject: Re: [PATCH 5/6 v4] cfq-iosched: CFQ group hierarchical scheduling and use_hierarchy interface On Wed, Feb 16, 2011 at 09:28:07AM -0800, Divyesh Shah wrote: > On Wed, Feb 16, 2011 at 9:22 AM, Divyesh Shah <dpshah@...gle.com> wrote: > > On Tue, Feb 15, 2011 at 5:44 PM, Gui Jianfeng > > <guijianfeng@...fujitsu.com> wrote: > >> Hmm, it seems memcg aggregating stats in parent group. > >> But do we really need to do that in kernel? I think it's easier to do it in > >> userland, and it makes kernel much simpler. > >> > > > > I would prefer having stats aggregated up the hierarchy. One trick we > > used at Google earlier was to do lazy updates for most stats. So we > > Note that this was on ancient version of the blkio controller :). As > Vivek mentioned, > it may be ok to add the hierarchical accounting later. One improvement we can probably do is make accounting per cpu and make it lockless. Thanks Vivek -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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