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Date: Tue, 14 Dec 2010 11:30:48 +0800 From: Gui Jianfeng <guijianfeng@...fujitsu.com> To: Jens Axboe <axboe@...nel.dk> CC: Vivek Goyal <vgoyal@...hat.com>, Corrado Zoccolo <czoccolo@...il.com>, Chad Talbott <ctalbott@...gle.com>, Nauman Rafique <nauman@...gle.com>, Divyesh Shah <dpshah@...gle.com>, linux kernel mailing list <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 0/8 v2] Introduce CFQ group hierarchical scheduling and "use_hierarchy" interface Jens Axboe wrote: > On 2010-12-13 02:44, Gui Jianfeng wrote: >> Hi >> >> Previously, I posted a patchset to add support of CFQ group hierarchical scheduling >> in the way that it puts all CFQ queues in a hidden group and schedules with other >> CFQ group under their parent. The patchset is available here, >> http://lkml.org/lkml/2010/8/30/30 >> >> Vivek think this approach isn't so instinct that we should treat CFQ queues >> and groups at the same level. Here is the new approach for hierarchical >> scheduling based on Vivek's suggestion. The most big change of CFQ is that >> it gets rid of cfq_slice_offset logic, and makes use of vdisktime for CFQ >> queue scheduling just like CFQ group does. But I still give cfqq some jump >> in vdisktime based on ioprio, thanks for Vivek to point out this. Now CFQ >> queue and CFQ group uses the same scheduling algorithm. >> >> "use_hierarchy" interface is now added to switch between hierarchical mode >> and flat mode. For this time being, this interface only appears in Root Cgroup. >> >> V1 -> V2 Changes: >> - Raname "struct io_sched_entity" to "struct cfq_entity" and don't differentiate >> queue_entity and group_entity, just use cfqe instead. >> - Give newly added cfqq a small vdisktime jump accord to its ioprio. >> - Make flat mode as default CFQ group scheduling mode. >> - Introduce "use_hierarchy" interface. >> - Update blkio cgroup documents >> >> [PATCH 1/8 v2] cfq-iosched: Introduce cfq_entity for CFQ queue >> [PATCH 2/8 v2] cfq-iosched: Introduce cfq_entity for CFQ group >> [PATCH 3/8 v2] cfq-iosched: Introduce vdisktime and io weight for CFQ queue >> [PATCH 4/8 v2] cfq-iosched: Extract some common code of service tree handling for CFQ queue and CFQ group >> [PATCH 5/8 v2] cfq-iosched: Introduce hierarchical scheduling with CFQ queue and group at the same level >> [PATCH 6/8] blkio-cgroup: "use_hierarchy" interface without any functionality >> [PATCH 7/8] cfq-iosched: Add flat mode and switch between two modes by "use_hierarchy" >> [PATCH 8/8] blkio-cgroup: Document for blkio.use_hierarchy. >> >> Benchmarks: >> I made use of Vivek's iostest to perform some benchmarks on my box. I tested different workloads, and >> didn't see any performance drop comparing to vanilla kernel. The attached files are some performance >> numbers on vanilla Kernel, patched kernel with flat mode and patched kernel with hierarchical mode. > > I was going to apply this patchset now, but it doesn't apply to current > for-2.6.38/core (#5 fails, git am stops there). Care to resend it > against that branch? Thanks. Sure. 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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