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Date: Mon, 24 May 2010 09:12:05 +0800 From: Gui Jianfeng <guijianfeng@...fujitsu.com> To: Vivek Goyal <vgoyal@...hat.com> CC: Jens Axboe <jens.axboe@...cle.com>, linux kernel mailing list <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 0/4] io-controller: Add new interfaces to trace backlogged group status Vivek Goyal wrote: > On Fri, May 21, 2010 at 04:40:50PM +0800, Gui Jianfeng wrote: >> Hi, >> >> This series implements three new interfaces to keep track of tranferred bytes, >> elapsing time and io rate since group getting backlogged. If the group dequeues >> from service tree, these three interfaces will reset and shows zero. > > Hi Gui, > > Can you give some details regarding how this functionality is useful? Why > would somebody be interested in only in stats of till group was > backlogged and not in total stats? > > Groups can come and go so fast and these stats will reset so many times > that I am not able to visualize how these stats will be useful. Hi Vivek, Currently, we assign weight to a group, but user still doesn't know how fast the group runs. With io rate interface, users can check the rate of a group at any moment, or to determine whether the weight assigned to a group is enough. bytes and time interface is just for debug purpose. Thanks, Gui > > Thanks > Vivek > >> Thanks >> Gui > > -- 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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