From: Vincent Guittot <vincent.guittot@linaro.org> To: Morten Rasmussen <morten.rasmussen@arm.com> Cc: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@kernel.org>, linux-kernel <linux-kernel@vger.kernel.org>, Preeti U Murthy <preeti@linux.vnet.ibm.com>, Russell King - ARM Linux <linux@arm.linux.org.uk>, LAK <linux-arm-kernel@lists.infradead.org>, Rik van Riel <riel@redhat.com>, Mike Galbraith <efault@gmx.de>, Nicolas Pitre <nicolas.pitre@linaro.org>, "linaro-kernel@lists.linaro.org" <linaro-kernel@lists.linaro.org>, Daniel Lezcano <daniel.lezcano@linaro.org>, Dietmar Eggemann <Dietmar.Eggemann@arm.com> Subject: Re: [PATCH v5 10/12] sched: get CPU's utilization statistic Date: Tue, 16 Sep 2014 15:43:18 -0700 [thread overview] Message-ID: <CAKfTPtCTxQNQfusJuQhGy7ahDFWjwitQOZHU89O0wyy5ZcNO9A@mail.gmail.com> (raw) In-Reply-To: <20140915194518.GC28083@e103687> On 15 September 2014 12:45, Morten Rasmussen <morten.rasmussen@arm.com> wrote: > On Thu, Sep 11, 2014 at 03:04:44PM +0100, Peter Zijlstra wrote: >> On Thu, Sep 11, 2014 at 03:07:52PM +0200, Vincent Guittot wrote: >> > > Also I'm not entirely sure I like the usage, utilization names/metrics. >> > > I would suggest to reverse them. Call the pure running number >> > > 'utilization' and this scaled with capacity 'usage' or so. >> > >> > ok. i can invert 'usage' and 'utilization', which will give >> > >> > s/get_cpu_utilization/get_cpu_usage/ >> > s/sgs->group_utilization/sgs->group_usage/ > > The confusion will have new dimensions added when we introduce > scale-invariance too. Then the running number is already scaled by the > current P-state compute capacity. But I don't have any better > suggestions. > >> > s/cfs.usage_load_avg/cfs.utilization_load_avg/ > > I don't like using "load" for unweighted metrics. I associate load with > something that may be weighted by priority like load_avg_contrib, and > utilization with pure cpu utilization as in how many cycles is spend on > a particular task. I called it "usage_util_avg" in my own patches, but > "util_avg" might be better if we agree that utilization == usage. ok. so i don't have the same definition than you. IMHO, load should be used for figures that have used the average of the geometric series used in the per entity load tracking more than the fact that we weight the figures with priority > >> > s/se->avg.usage_avg_contrib/se->avg.utilization_avg_contrib > > util_avg_contrib maybe to keep it shorter. > >> > s/__update_task_entity_usage/__update_task_entity_utilization >> > s/__update_entity_usage_avg_contrib/__update_entity_utilization_avg_contrib > > Maybe use "util" here as well? I agree that utilization can be a bit too long but util sounds a bit too short ans we loose the utilization meaning. so we could use activity instead of utilization Nevertheless, the most important is that we find a common definition convention Would the following proposal be ok ? s/get_cpu_utilization/get_cpu_usage/ s/sgs->group_utilization/sgs->group_usage/ s/cfs.usage_load_avg/cfs.activity_load_avg/ s/se->avg.usage_avg_contrib/se->avg.activity_avg_contrib s/__update_task_entity_usage/__update_task_entity_activity s/__update_entity_usage_avg_contrib/__update_entity_activity_avg_contrib Vincent > > Morten >
WARNING: multiple messages have this Message-ID (diff)
From: vincent.guittot@linaro.org (Vincent Guittot) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v5 10/12] sched: get CPU's utilization statistic Date: Tue, 16 Sep 2014 15:43:18 -0700 [thread overview] Message-ID: <CAKfTPtCTxQNQfusJuQhGy7ahDFWjwitQOZHU89O0wyy5ZcNO9A@mail.gmail.com> (raw) In-Reply-To: <20140915194518.GC28083@e103687> On 15 September 2014 12:45, Morten Rasmussen <morten.rasmussen@arm.com> wrote: > On Thu, Sep 11, 2014 at 03:04:44PM +0100, Peter Zijlstra wrote: >> On Thu, Sep 11, 2014 at 03:07:52PM +0200, Vincent Guittot wrote: >> > > Also I'm not entirely sure I like the usage, utilization names/metrics. >> > > I would suggest to reverse them. Call the pure running number >> > > 'utilization' and this scaled with capacity 'usage' or so. >> > >> > ok. i can invert 'usage' and 'utilization', which will give >> > >> > s/get_cpu_utilization/get_cpu_usage/ >> > s/sgs->group_utilization/sgs->group_usage/ > > The confusion will have new dimensions added when we introduce > scale-invariance too. Then the running number is already scaled by the > current P-state compute capacity. But I don't have any better > suggestions. > >> > s/cfs.usage_load_avg/cfs.utilization_load_avg/ > > I don't like using "load" for unweighted metrics. I associate load with > something that may be weighted by priority like load_avg_contrib, and > utilization with pure cpu utilization as in how many cycles is spend on > a particular task. I called it "usage_util_avg" in my own patches, but > "util_avg" might be better if we agree that utilization == usage. ok. so i don't have the same definition than you. IMHO, load should be used for figures that have used the average of the geometric series used in the per entity load tracking more than the fact that we weight the figures with priority > >> > s/se->avg.usage_avg_contrib/se->avg.utilization_avg_contrib > > util_avg_contrib maybe to keep it shorter. > >> > s/__update_task_entity_usage/__update_task_entity_utilization >> > s/__update_entity_usage_avg_contrib/__update_entity_utilization_avg_contrib > > Maybe use "util" here as well? I agree that utilization can be a bit too long but util sounds a bit too short ans we loose the utilization meaning. so we could use activity instead of utilization Nevertheless, the most important is that we find a common definition convention Would the following proposal be ok ? s/get_cpu_utilization/get_cpu_usage/ s/sgs->group_utilization/sgs->group_usage/ s/cfs.usage_load_avg/cfs.activity_load_avg/ s/se->avg.usage_avg_contrib/se->avg.activity_avg_contrib s/__update_task_entity_usage/__update_task_entity_activity s/__update_entity_usage_avg_contrib/__update_entity_activity_avg_contrib Vincent > > Morten >
next prev parent reply other threads:[~2014-09-16 22:43 UTC|newest] Thread overview: 164+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-08-26 11:06 [PATCH v5 00/12] sched: consolidation of cpu_capacity Vincent Guittot 2014-08-26 11:06 ` Vincent Guittot 2014-08-26 11:06 ` [PATCH v5 01/12] sched: fix imbalance flag reset Vincent Guittot 2014-08-26 11:06 ` Vincent Guittot 2014-09-19 11:47 ` [tip:sched/core] sched: Fix " tip-bot for Vincent Guittot 2014-08-26 11:06 ` [PATCH v5 02/12] sched: remove a wake_affine condition Vincent Guittot 2014-08-26 11:06 ` Vincent Guittot 2014-09-19 11:47 ` [tip:sched/core] sched: Remove a wake_affine() condition tip-bot for Vincent Guittot 2014-08-26 11:06 ` [PATCH v5 03/12] sched: fix avg_load computation Vincent Guittot 2014-08-26 11:06 ` Vincent Guittot 2014-08-30 12:00 ` Preeti U Murthy 2014-08-30 12:00 ` Preeti U Murthy 2014-09-03 11:09 ` Vincent Guittot 2014-09-03 11:09 ` Vincent Guittot 2014-09-03 23:43 ` Tim Chen 2014-09-03 23:43 ` Tim Chen 2014-09-04 7:17 ` Vincent Guittot 2014-09-04 7:17 ` Vincent Guittot 2014-09-04 16:26 ` Tim Chen 2014-09-04 16:26 ` Tim Chen 2014-09-05 11:10 ` Preeti U Murthy 2014-09-05 11:10 ` Preeti U Murthy 2014-09-19 11:47 ` [tip:sched/core] sched: Fix " tip-bot for Vincent Guittot 2014-08-26 11:06 ` [PATCH v5 04/12] sched: Allow all archs to set the capacity_orig Vincent Guittot 2014-08-26 11:06 ` Vincent Guittot 2014-08-27 13:12 ` Kamalesh Babulal 2014-08-27 13:12 ` Kamalesh Babulal 2014-08-30 17:07 ` Preeti U Murthy 2014-08-30 17:07 ` Preeti U Murthy 2014-09-01 8:05 ` Vincent Guittot 2014-09-01 8:05 ` Vincent Guittot 2014-09-03 8:41 ` Preeti U Murthy 2014-09-03 8:41 ` Preeti U Murthy 2014-09-10 13:50 ` Peter Zijlstra 2014-09-10 13:50 ` Peter Zijlstra 2014-09-10 14:22 ` Vincent Guittot 2014-09-10 14:22 ` Vincent Guittot 2014-09-11 10:36 ` Preeti U Murthy 2014-09-11 10:36 ` Preeti U Murthy 2014-09-19 11:47 ` [tip:sched/core] sched: Allow all architectures to set ' capacity_orig' tip-bot for Vincent Guittot 2014-08-26 11:06 ` [PATCH v5 05/12] ARM: topology: use new cpu_capacity interface Vincent Guittot 2014-08-26 11:06 ` Vincent Guittot 2014-09-11 18:52 ` Nicolas Pitre 2014-09-11 18:52 ` Nicolas Pitre 2014-09-19 11:48 ` [tip:sched/core] ARM: topology: Use the " tip-bot for Vincent Guittot 2014-08-26 11:06 ` [PATCH v5 06/12] sched: add per rq cpu_capacity_orig Vincent Guittot 2014-08-26 11:06 ` Vincent Guittot 2014-08-27 13:32 ` Kamalesh Babulal 2014-08-27 13:32 ` Kamalesh Babulal 2014-08-28 7:34 ` Vincent Guittot 2014-08-28 7:34 ` Vincent Guittot 2014-09-10 13:53 ` Peter Zijlstra 2014-09-10 13:53 ` Peter Zijlstra 2014-09-10 14:19 ` Vincent Guittot 2014-09-10 14:19 ` Vincent Guittot 2014-09-11 19:02 ` Nicolas Pitre 2014-09-11 19:02 ` Nicolas Pitre 2014-09-15 21:22 ` Vincent Guittot 2014-09-15 21:22 ` Vincent Guittot 2014-08-26 11:06 ` [PATCH v5 07/12] sched: test the cpu's capacity in wake affine Vincent Guittot 2014-08-26 11:06 ` Vincent Guittot 2014-09-10 14:19 ` Peter Zijlstra 2014-09-10 14:19 ` Peter Zijlstra 2014-09-19 11:48 ` [tip:sched/core] sched: Test the CPU's capacity in wake_affine() tip-bot for Vincent Guittot 2014-08-26 11:06 ` [PATCH v5 08/12] sched: move cfs task on a CPU with higher capacity Vincent Guittot 2014-08-26 11:06 ` Vincent Guittot 2014-08-30 17:50 ` Preeti U Murthy 2014-08-30 17:50 ` Preeti U Murthy 2014-09-01 8:45 ` Vincent Guittot 2014-09-01 8:45 ` Vincent Guittot 2014-09-03 9:11 ` Preeti U Murthy 2014-09-03 9:11 ` Preeti U Murthy 2014-09-03 11:44 ` Vincent Guittot 2014-09-03 11:44 ` Vincent Guittot 2014-09-03 12:26 ` Preeti U Murthy 2014-09-03 12:26 ` Preeti U Murthy 2014-09-03 12:49 ` Vincent Guittot 2014-09-03 12:49 ` Vincent Guittot 2014-09-11 9:27 ` Peter Zijlstra 2014-09-11 9:27 ` Peter Zijlstra 2014-09-05 12:06 ` Preeti U Murthy 2014-09-05 12:06 ` Preeti U Murthy 2014-09-05 12:24 ` Vincent Guittot 2014-09-05 12:24 ` Vincent Guittot 2014-09-11 10:07 ` Peter Zijlstra 2014-09-11 10:07 ` Peter Zijlstra 2014-09-11 11:20 ` Vincent Guittot 2014-09-11 11:20 ` Vincent Guittot 2014-09-11 10:13 ` Peter Zijlstra 2014-09-11 10:13 ` Peter Zijlstra 2014-09-11 12:14 ` Vincent Guittot 2014-09-11 12:14 ` Vincent Guittot 2014-09-11 11:54 ` Peter Zijlstra 2014-09-11 11:54 ` Peter Zijlstra 2014-08-26 11:06 ` [PATCH v5 09/12] sched: add usage_load_avg Vincent Guittot 2014-08-26 11:06 ` Vincent Guittot 2014-09-04 7:34 ` [PATCH v5 09/11] " Vincent Guittot 2014-09-04 7:34 ` Vincent Guittot 2014-09-11 11:17 ` Peter Zijlstra 2014-09-11 11:17 ` Peter Zijlstra 2014-09-11 11:17 ` [PATCH v5 09/12] " Peter Zijlstra 2014-09-11 11:17 ` Peter Zijlstra 2014-09-11 12:18 ` Vincent Guittot 2014-09-11 12:18 ` Vincent Guittot 2014-09-11 12:20 ` Vincent Guittot 2014-09-11 12:20 ` Vincent Guittot 2014-09-15 19:15 ` Morten Rasmussen 2014-09-15 19:15 ` Morten Rasmussen 2014-09-15 22:33 ` Vincent Guittot 2014-09-15 22:33 ` Vincent Guittot 2014-08-26 11:06 ` [PATCH v5 10/12] sched: get CPU's utilization statistic Vincent Guittot 2014-08-26 11:06 ` Vincent Guittot 2014-09-11 12:34 ` Peter Zijlstra 2014-09-11 12:34 ` Peter Zijlstra 2014-09-11 13:07 ` Vincent Guittot 2014-09-11 13:07 ` Vincent Guittot 2014-09-11 14:04 ` Peter Zijlstra 2014-09-11 14:04 ` Peter Zijlstra 2014-09-11 19:17 ` Nicolas Pitre 2014-09-11 19:17 ` Nicolas Pitre 2014-09-12 7:41 ` Vincent Guittot 2014-09-12 7:41 ` Vincent Guittot 2014-09-15 19:45 ` Morten Rasmussen 2014-09-15 19:45 ` Morten Rasmussen 2014-09-16 22:43 ` Vincent Guittot [this message] 2014-09-16 22:43 ` Vincent Guittot 2014-09-15 19:28 ` Morten Rasmussen 2014-09-15 19:28 ` Morten Rasmussen 2014-08-26 11:06 ` [PATCH v5 11/12] sched: replace capacity_factor by utilization Vincent Guittot 2014-08-26 11:06 ` Vincent Guittot 2014-09-11 15:39 ` Peter Zijlstra 2014-09-11 15:39 ` Peter Zijlstra 2014-09-11 16:15 ` Peter Zijlstra 2014-09-11 16:15 ` Peter Zijlstra 2014-09-11 17:26 ` Vincent Guittot 2014-09-11 17:26 ` Vincent Guittot 2014-09-14 19:41 ` Peter Zijlstra 2014-09-14 19:41 ` Peter Zijlstra 2014-09-14 19:51 ` Peter Zijlstra 2014-09-14 19:51 ` Peter Zijlstra 2014-09-15 11:42 ` Peter Zijlstra 2014-09-15 11:42 ` Peter Zijlstra 2014-09-15 19:07 ` Nicolas Pitre 2014-09-15 19:07 ` Nicolas Pitre 2014-09-15 20:01 ` Peter Zijlstra 2014-09-15 20:01 ` Peter Zijlstra 2014-09-17 18:45 ` Morten Rasmussen 2014-09-17 18:45 ` Morten Rasmussen 2014-09-17 18:58 ` Morten Rasmussen 2014-09-17 18:58 ` Morten Rasmussen 2014-09-17 23:03 ` Peter Zijlstra 2014-09-17 23:03 ` Peter Zijlstra 2014-09-15 22:14 ` Vincent Guittot 2014-09-15 22:14 ` Vincent Guittot 2014-09-15 22:18 ` Vincent Guittot 2014-09-15 22:18 ` Vincent Guittot 2014-09-17 22:25 ` Peter Zijlstra 2014-09-17 22:25 ` Peter Zijlstra 2014-09-18 1:32 ` Vincent Guittot 2014-09-18 1:32 ` Vincent Guittot 2014-09-16 17:00 ` Dietmar Eggemann 2014-09-16 17:00 ` Dietmar Eggemann 2014-08-26 11:06 ` [PATCH v5 12/12] sched: add SD_PREFER_SIBLING for SMT level Vincent Guittot 2014-08-26 11:06 ` Vincent Guittot
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