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Date: Sat, 12 Mar 2016 18:04:22 +0100 From: Mike Galbraith <umgwanakikbuti@...il.com> To: Tejun Heo <tj@...nel.org>, torvalds@...ux-foundation.org, akpm@...ux-foundation.org, a.p.zijlstra@...llo.nl, mingo@...hat.com, lizefan@...wei.com, hannes@...xchg.org, pjt@...gle.com Cc: linux-kernel@...r.kernel.org, cgroups@...r.kernel.org, linux-api@...r.kernel.org, kernel-team@...com Subject: Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource group and PRIO_RGRP On Sat, 2016-03-12 at 07:26 +0100, Mike Galbraith wrote: > On Fri, 2016-03-11 at 10:41 -0500, Tejun Heo wrote: > > Hello, > > > > This patchset extends cgroup v2 to support rgroup (resource group) for > > in-process hierarchical resource control and implements PRIO_RGRP for > > setpriority(2) on top to allow in-process hierarchical CPU cycle > > control in a seamless way. > > > > cgroup v1 allowed putting threads of a process in different cgroups > > which enabled ad-hoc in-process resource control of some resources. BTW, within the scheduler, "process" does not exist. A high level composite entity is what we currently aggregate from arbitrary individual entities, a.k.a threads. Whether an individual entity be an un-threaded "process" bash, a thread of "process" oracle, or one of "process!?!" kernel is irrelevant. What entity aggregation has to do with "process" eludes me completely. What's ad-hoc or unusual about a thread pool servicing an arbitrary number of customers using cgroup bean accounting? Job arrives from customer, worker is dispatched to customer workshop (cgroup), it does whatever on behest of customer, sends bean count off to the billing department, and returns to the break room. What's so annoying about using bean counters for.. counting beans that you want to forbid it? -Mike
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